diff --git a/docs/imts.html b/docs/imts.html index bec6b8f..34a7395 100644 --- a/docs/imts.html +++ b/docs/imts.html @@ -348,7 +348,7 @@ Find out what band and channels your phone supports. Then get a list of all avai

Assume the phone supports VHF Low band, so we select channel 'YK' with the command line option '-k YK', or select any other channel your phone supports. -In order to have a low latency, you must add '-b 5' to the command line option. +In order to have a low latency, you must add '-b 5 -i 0.1' to the command line option. Then tune the transmitter to the indicated channel and receiver to the other indicated channel. Transmit with a normal loud speech volume, but not too loud. The actual level is not yet relevant. @@ -356,7 +356,7 @@ The actual level is not yet relevant.

 
-# src/imts/imts -k YK -b 5
+# src/imts/imts -k YK -b 5 -i 0.1
 ...
 imts.c:381 info   : Entering IDLE state on channel YK, sending 2000 Hz tone.
 imts.c:336 notice : Created channel #YK
@@ -382,7 +382,7 @@ If the phone transmits, your base station should respond to the seize sequence b
 
 
 
-# src/imts/imts -k YK -b 5
+# src/imts/imts -k YK -b 5 -i 0.1
 ...
 imts.c:381 info   : Entering IDLE state on channel YK, sending 2000 Hz tone.
 imts.c:336 notice : Created channel #YK
diff --git a/src/amps/amps.c b/src/amps/amps.c
index 8ab3e56..c4f61cd 100644
--- a/src/amps/amps.c
+++ b/src/amps/amps.c
@@ -491,7 +491,7 @@ static amps_t *search_pc(void)
 }
 
 /* Create transceiver instance and link to a list. */
-int amps_create(const char *kanal, enum amps_chan_type chan_type, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, amps_si *si, uint16_t sid, uint8_t sat, int polarity, int tolerant, int loopback)
+int amps_create(const char *kanal, enum amps_chan_type chan_type, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, amps_si *si, uint16_t sid, uint8_t sat, int polarity, int tolerant, int loopback)
 {
 	sender_t *sender;
 	amps_t *amps;
@@ -562,7 +562,7 @@ int amps_create(const char *kanal, enum amps_chan_type chan_type, const char *au
 	PDEBUG(DAMPS, DEBUG_DEBUG, "Creating 'AMPS' instance for channel = %s of band %s (sample rate %d).\n", kanal, band, samplerate);
 
 	/* init general part of transceiver */
-	rc = sender_create(&s->sender, kanal, amps_channel2freq(atoi(kanal), 0), amps_channel2freq(atoi(kanal), 1), audiodev, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&s->sender, kanal, amps_channel2freq(atoi(kanal), 0), amps_channel2freq(atoi(kanal), 1), device, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DAMPS, DEBUG_ERROR, "Failed to init transceiver process!\n");
 		goto error;
diff --git a/src/amps/amps.h b/src/amps/amps.h
index 579fc0a..71bbc47 100644
--- a/src/amps/amps.h
+++ b/src/amps/amps.h
@@ -174,7 +174,7 @@ const char *amps_min12number(uint32_t min1);
 void amps_number2min(const char *number, uint32_t *min1, uint16_t *min2);
 const char *amps_min2number(uint32_t min1, uint16_t min2);
 const char *amps_scm(uint8_t scm);
-int amps_create(const char *kanal, enum amps_chan_type chan_type, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, amps_si *si, uint16_t sid, uint8_t sat, int polarity, int tolerant, int loopback);
+int amps_create(const char *kanal, enum amps_chan_type chan_type, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, amps_si *si, uint16_t sid, uint8_t sat, int polarity, int tolerant, int loopback);
 void amps_destroy(sender_t *sender);
 void amps_go_idle(amps_t *amps);
 void amps_rx_signaling_tone(amps_t *amps, int tone, double quality);
diff --git a/src/amps/amps_tacs_main.c b/src/amps/amps_tacs_main.c
index 808eb31..bf71dd1 100644
--- a/src/amps/amps_tacs_main.c
+++ b/src/amps/amps_tacs_main.c
@@ -235,7 +235,7 @@ int main_amps_tacs(const char *name, int argc, char *argv[])
 	int i;
 
 	/* override default */
-	samplerate = 96000;
+	dsp_samplerate = 96000;
 
 	main_mobile_init();
 
@@ -269,10 +269,10 @@ int main_amps_tacs(const char *name, int argc, char *argv[])
 		return 0;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 		/* set channel types for more than 1 channel */
 		if (num_kanal > 1 && num_chan_type == 0) {
 			chan_type[0] = CHAN_TYPE_CC_PC;
@@ -281,9 +281,9 @@ int main_amps_tacs(const char *name, int argc, char *argv[])
 			num_chan_type = num_kanal;
 		}
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
@@ -320,8 +320,8 @@ int main_amps_tacs(const char *name, int argc, char *argv[])
 
 	}
 
-	if (bis && latency > 5) {
-		fprintf(stderr, "If you use BUSY/IDLE bit, you need to lower the round-trip delay to 5 ms (--latency 5).\n");
+	if (bis && dsp_buffer > 5) {
+		fprintf(stderr, "If you use BUSY/IDLE bit, you need to lower the round-trip delay to 5 ms (--buffer 5).\n");
 		exit(0);
 	}
 
@@ -381,7 +381,7 @@ int main_amps_tacs(const char *name, int argc, char *argv[])
 		amps_si si;
 
 		init_sysinfo(&si, ms_power, ms_power, dtx, dcc, sid >> 1, regh, regr, pureg, pdreg, locaid, regincr, bis);
-		rc = amps_create(kanal[i], chan_type[i], audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, &si, sid, scc, polarity, tolerant, loopback);
+		rc = amps_create(kanal[i], chan_type[i], dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, &si, sid, scc, polarity, tolerant, loopback);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Sender\" instance. Quitting!\n");
 			goto fail;
@@ -392,7 +392,7 @@ int main_amps_tacs(const char *name, int argc, char *argv[])
 			printf("Base station on channel %s ready (%s), please tune transmitter to %.4f MHz and receiver to %.4f MHz. (%.3f MHz offset)\n", kanal[i], chan_type_long_name(chan_type[i]), amps_channel2freq(atoi(kanal[i]), 0) / 1e6, amps_channel2freq(atoi(kanal[i]), 1) / 1e6, amps_channel2freq(atoi(kanal[i]), 2) / 1e6);
 	}
 
-	main_mobile(name, &quit, latency, interval, NULL, station_id, 10);
+	main_mobile(name, &quit, NULL, station_id, 10);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/anetz/anetz.c b/src/anetz/anetz.c
index c598b1a..f9b0c56 100644
--- a/src/anetz/anetz.c
+++ b/src/anetz/anetz.c
@@ -183,7 +183,7 @@ static void anetz_timeout(struct timer *timer);
 static void anetz_go_idle(anetz_t *anetz);
 
 /* Create transceiver instance and link to a list. */
-int anetz_create(const char *kanal, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, double page_gain, int page_sequence, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, const char *operator)
+int anetz_create(const char *kanal, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, double page_gain, int page_sequence, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, const char *operator)
 {
 	anetz_t *anetz;
 	int rc;
@@ -204,7 +204,7 @@ int anetz_create(const char *kanal, const char *audiodev, int use_sdr, int sampl
 	PDEBUG(DANETZ, DEBUG_DEBUG, "Creating 'A-Netz' instance for 'Kanal' = %s (sample rate %d).\n", kanal, samplerate);
 
 	/* init general part of transceiver */
-	rc = sender_create(&anetz->sender, kanal, anetz_kanal2freq(atoi(kanal), 0), anetz_kanal2freq(atoi(kanal), 1), audiodev, use_sdr, samplerate, rx_gain, tx_gain, pre_emphasis, de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&anetz->sender, kanal, anetz_kanal2freq(atoi(kanal), 0), anetz_kanal2freq(atoi(kanal), 1), device, use_sdr, samplerate, rx_gain, tx_gain, pre_emphasis, de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DANETZ, DEBUG_ERROR, "Failed to init 'Sender' processing!\n");
 		goto error;
diff --git a/src/anetz/anetz.h b/src/anetz/anetz.h
index 30dc763..57ab270 100644
--- a/src/anetz/anetz.h
+++ b/src/anetz/anetz.h
@@ -54,7 +54,7 @@ typedef struct anetz {
 
 double anetz_kanal2freq(int kanal, int unterband);
 int anetz_init(void);
-int anetz_create(const char *kanal, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, double page_gain, int page_sequence, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, const char *operator);
+int anetz_create(const char *kanal, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, double page_gain, int page_sequence, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, const char *operator);
 void anetz_destroy(sender_t *sender);
 void anetz_loss_indication(anetz_t *anetz, double loss_time);
 void anetz_receive_tone(anetz_t *anetz, int bit);
diff --git a/src/anetz/main.c b/src/anetz/main.c
index 03e9c99..edcf71a 100644
--- a/src/anetz/main.c
+++ b/src/anetz/main.c
@@ -161,14 +161,14 @@ int main(int argc, char *argv[])
 		return 0;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
@@ -180,7 +180,7 @@ int main(int argc, char *argv[])
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = anetz_create(kanal[i], audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, page_gain, page_sequence, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, operator);
+		rc = anetz_create(kanal[i], dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, page_gain, page_sequence, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, operator);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Sender\" instance. Quitting!\n");
 			goto fail;
@@ -188,7 +188,7 @@ int main(int argc, char *argv[])
 		printf("Base station on channel %s ready, please tune transmitter to %.3f MHz and receiver to %.3f MHz. (%.3f MHz offset)\n", kanal[i], anetz_kanal2freq(atoi(kanal[i]), 0) / 1e6, anetz_kanal2freq(atoi(kanal[i]), 1) / 1e6, anetz_kanal2freq(atoi(kanal[i]), 2) / 1e6);
 	}
 
-	main_mobile("anetz", &quit, latency, interval, NULL, station_id, 5);
+	main_mobile("anetz", &quit, NULL, station_id, 5);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/bnetz/bnetz.c b/src/bnetz/bnetz.c
index 725dd9b..fa75303 100644
--- a/src/bnetz/bnetz.c
+++ b/src/bnetz/bnetz.c
@@ -154,7 +154,7 @@ static void bnetz_timeout(struct timer *timer);
 static void bnetz_go_idle(bnetz_t *bnetz);
 
 /* Create transceiver instance and link to a list. */
-int bnetz_create(const char *kanal, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int gfs, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, const char *paging, int metering)
+int bnetz_create(const char *kanal, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int gfs, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, const char *paging, int metering)
 {
 	bnetz_t *bnetz;
 	enum paging_signal paging_signal = PAGING_SIGNAL_NONE;
@@ -220,7 +220,7 @@ error_paging:
 	PDEBUG(DBNETZ, DEBUG_DEBUG, "Creating 'B-Netz' instance for 'Kanal' = %s 'Gruppenfreisignal' = %d (sample rate %d).\n", kanal, gfs, samplerate);
 
 	/* init general part of transceiver */
-	rc = sender_create(&bnetz->sender, kanal, bnetz_kanal2freq(atoi(kanal), 0), bnetz_kanal2freq(atoi(kanal), 1), audiodev, use_sdr, samplerate, rx_gain, tx_gain, pre_emphasis, de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, paging_signal);
+	rc = sender_create(&bnetz->sender, kanal, bnetz_kanal2freq(atoi(kanal), 0), bnetz_kanal2freq(atoi(kanal), 1), device, use_sdr, samplerate, rx_gain, tx_gain, pre_emphasis, de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, paging_signal);
 	if (rc < 0) {
 		PDEBUG(DBNETZ, DEBUG_ERROR, "Failed to init transceiver process!\n");
 		goto error;
diff --git a/src/bnetz/bnetz.h b/src/bnetz/bnetz.h
index 4033a6b..fa19cd0 100644
--- a/src/bnetz/bnetz.h
+++ b/src/bnetz/bnetz.h
@@ -113,7 +113,7 @@ typedef struct bnetz {
 
 double bnetz_kanal2freq(int kanal, int unterband);
 int bnetz_init(void);
-int bnetz_create(const char *kanal, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int gfs, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, const char *paging, int metering);
+int bnetz_create(const char *kanal, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int gfs, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, const char *paging, int metering);
 void bnetz_destroy(sender_t *sender);
 void bnetz_loss_indication(bnetz_t *bnetz, double loss_time);
 void bnetz_receive_tone(bnetz_t *bnetz, int bit);
diff --git a/src/bnetz/dialer.c b/src/bnetz/dialer.c
index 821a403..ab625b6 100644
--- a/src/bnetz/dialer.c
+++ b/src/bnetz/dialer.c
@@ -42,10 +42,10 @@
 char start_digit = 's';
 const char *station_id = "50993";
 const char *dialing;
-const char *audiodev = "hw:0,0";
-int samplerate = 48000;
+const char *dsp_audiodev = "hw:0,0";
+int dsp_samplerate = 48000;
 const char *write_tx_wave = NULL;
-int latency = 50;
+int dsp_buffer = 50;
 
 /* states */
 enum tx_mode {
@@ -58,7 +58,6 @@ char funkwahl[128];
 int digit_pos = 0;
 const char *tx_telegramm = NULL;
 int tx_telegramm_pos = 0;
-int latspl;
 
 /* instances */
 fsk_mod_t fsk_mod;
@@ -90,10 +89,10 @@ static void print_help(const char *arg0)
 	printf("        5 Digits of ID of mobile station (default = '%s')\n", station_id);
 #ifdef HAVE_ALSA
 	printf(" -a --audio-device hw:,\n");
-	printf("        Sound card and device number (default = '%s')\n", audiodev);
+	printf("        Sound card and device number (default = '%s')\n", dsp_audiodev);
 #endif
 	printf(" -s --samplerate \n");
-	printf("        Sample rate of sound device (default = '%d')\n", samplerate);
+	printf("        Sample rate of sound device (default = '%d')\n", dsp_samplerate);
 	printf(" -w --write-tx-wave \n");
 	printf("        Write audio to given wave file also.\n");
 	printf(" -g --gebuehenimpuls\n");
@@ -128,10 +127,10 @@ static int handle_options(int short_option, int __attribute__((unused)) argi, ch
 		station_id = options_strdup(argv[argi]);
 		break;
 	case 'a':
-		audiodev = options_strdup(argv[argi]);
+		dsp_audiodev = options_strdup(argv[argi]);
 		break;
 	case 's':
-		samplerate = atoi(argv[argi]);
+		dsp_samplerate = atoi(argv[argi]);
 		break;
 	case 'w':
 		write_tx_wave = options_strdup(argv[argi]);
@@ -216,7 +215,7 @@ again:
 	case TX_MODE_SILENCE:
 		memset(samples, 0, length * sizeof(*samples));
 		tx_silence_count += length;
-		if (tx_silence_count >= (int)((double)samplerate * MAX_PAUSE)) {
+		if (tx_silence_count >= (int)((double)dsp_samplerate * MAX_PAUSE)) {
 			if (funkwahl[digit_pos])
 				tx_mode = TX_MODE_FSK;
 			else
@@ -239,18 +238,18 @@ again:
 /* loop that gets audio from encoder and forwards it to sound card.
  * alternatively a sound file is written.
  */
-static void process_signal(void)
+static void process_signal(int buffer_size)
 {
-	sample_t buff[latspl], *samples[1] = { buff };
-        uint8_t pbuff[latspl], *power[1] = { pbuff };
+	sample_t buff[buffer_size], *samples[1] = { buff };
+        uint8_t pbuff[buffer_size], *power[1] = { pbuff };
 	int count;
 	int __attribute__((unused)) rc;
 
 	while (tx_mode != TX_MODE_DONE) {
 #ifdef HAVE_ALSA
-		count = sound_get_tosend(audio, latspl);
+		count = sound_get_tosend(audio, buffer_size);
 #else
-		count = samplerate / 1000;
+		count = dsp_samplerate / 1000;
 #endif
 		if (count < 0) {
 			PDEBUG(DDSP, DEBUG_ERROR, "Failed to get number of samples in buffer (rc = %d)!\n", count);
@@ -282,13 +281,14 @@ int main(int argc, char *argv[])
 {
 	int i;
 	int rc, argi;
+	int buffer_size;
 
 	/* init */
 	bnetz_init_telegramm();
 	memset(&fsk_mod, 0, sizeof(fsk_mod));
 
-	/* latency of send buffer in samples */
-	latspl = samplerate * latency / 1000;
+	/* size of send buffer in samples */
+	buffer_size = dsp_samplerate * dsp_buffer / 1000;
 
 	/* handle options / config file */
 	add_options();
@@ -339,14 +339,14 @@ int main(int argc, char *argv[])
 	sprintf(funkwahl, "wwww%c%s%se%c%s%se", start_digit, station_id, dialing + 1, start_digit, station_id, dialing + 1);
 
 	/* init fsk */
-	if (fsk_mod_init(&fsk_mod, NULL, fsk_send_bit, samplerate, BIT_RATE, F0, F1, 1.0, 0, 0) < 0) {
+	if (fsk_mod_init(&fsk_mod, NULL, fsk_send_bit, dsp_samplerate, BIT_RATE, F0, F1, 1.0, 0, 0) < 0) {
 		PDEBUG(DDSP, DEBUG_ERROR, "FSK init failed!\n");
 		goto exit;
 	}
 
 #ifdef HAVE_ALSA
 	/* init sound */
-	audio = sound_open(audiodev, NULL, NULL, NULL, 1, 0.0, samplerate, latspl, 1.0, 4000.0, 2.0);
+	audio = sound_open(dsp_audiodev, NULL, NULL, NULL, 1, 0.0, dsp_samplerate, buffer_size, 1.0, 1.0, 4000.0, 2.0);
 	if (!audio) {
 		PDEBUG(DBNETZ, DEBUG_ERROR, "No sound device!\n");
 		goto exit;
@@ -355,7 +355,7 @@ int main(int argc, char *argv[])
 
 	/* open wave */
 	if (write_tx_wave) {
-		rc = wave_create_record(&wave_tx_rec, write_tx_wave, samplerate, 1, 1.0);
+		rc = wave_create_record(&wave_tx_rec, write_tx_wave, dsp_samplerate, 1, 1.0);
 		if (rc < 0) {
 			PDEBUG(DBNETZ, DEBUG_ERROR, "Failed to create WAVE recoding instance!\n");
 			goto exit;
@@ -375,7 +375,7 @@ int main(int argc, char *argv[])
 
 	PDEBUG(DBNETZ, DEBUG_ERROR, "Start audio after pause...\n");
 
-	process_signal();
+	process_signal(buffer_size);
 
 exit:
 	/* close wave */
diff --git a/src/bnetz/main.c b/src/bnetz/main.c
index 772fbfb..d9ff4d5 100644
--- a/src/bnetz/main.c
+++ b/src/bnetz/main.c
@@ -160,14 +160,14 @@ int main(int argc, char *argv[])
 		return 0;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /*deviceuse default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
@@ -193,7 +193,7 @@ int main(int argc, char *argv[])
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = bnetz_create(kanal[i], audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, gfs, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, paging, metering);
+		rc = bnetz_create(kanal[i], dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, gfs, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, paging, metering);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Sender\" instance. Quitting!\n");
 			goto fail;
@@ -202,7 +202,7 @@ int main(int argc, char *argv[])
 		printf("To call phone, switch transmitter (using paging signal) to %.3f MHz.\n", bnetz_kanal2freq(19, 0) / 1e6);
 	}
 
-	main_mobile("bnetz", &quit, latency, interval, NULL, station_id, 5);
+	main_mobile("bnetz", &quit, NULL, station_id, 5);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/cnetz/cnetz.c b/src/cnetz/cnetz.c
index 4239b1c..44e84b7 100644
--- a/src/cnetz/cnetz.c
+++ b/src/cnetz/cnetz.c
@@ -264,7 +264,7 @@ int cnetz_init(void)
 }
 
 /* Create transceiver instance and link to a list. */
-int cnetz_create(const char *kanal, enum cnetz_chan_type chan_type, const char *audiodev, int use_sdr, enum demod_type demod, int samplerate, double rx_gain, double tx_gain, int challenge_valid, uint64_t challenge, int response_valid, uint64_t response, int warteschlange, int metering, double speech_deviation, int ms_power, int measure_speed, double clock_speed[2], int polarity, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback)
+int cnetz_create(const char *kanal, enum cnetz_chan_type chan_type, const char *device, int use_sdr, enum demod_type demod, int samplerate, double rx_gain, double tx_gain, int challenge_valid, uint64_t challenge, int response_valid, uint64_t response, int warteschlange, int metering, double speech_deviation, int ms_power, int measure_speed, double clock_speed[2], int polarity, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback)
 {
 	sender_t *sender;
 	cnetz_t *cnetz;
@@ -304,7 +304,7 @@ int cnetz_create(const char *kanal, enum cnetz_chan_type chan_type, const char *
 
 	for (sender = sender_head; sender; sender = sender->next) {
 		cnetz = (cnetz_t *)sender;
-		if (!!strcmp(sender->audiodev, audiodev)) {
+		if (!!strcmp(sender->device, device)) {
 			PDEBUG(DCNETZ, DEBUG_NOTICE, "To be able to sync multiple channels, all channels must be on the same sound device!\n");
 			return -EINVAL;
 		}
@@ -320,7 +320,7 @@ int cnetz_create(const char *kanal, enum cnetz_chan_type chan_type, const char *
 
 	/* init general part of transceiver */
 	/* do not enable emphasis, since it is done by cnetz code, not by common sender code */
-	rc = sender_create(&cnetz->sender, kanal, cnetz_kanal2freq(atoi(kanal), 0), cnetz_kanal2freq(atoi(kanal), 1), audiodev, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&cnetz->sender, kanal, cnetz_kanal2freq(atoi(kanal), 0), cnetz_kanal2freq(atoi(kanal), 1), device, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DCNETZ, DEBUG_ERROR, "Failed to init transceiver process!\n");
 		goto error;
diff --git a/src/cnetz/cnetz.h b/src/cnetz/cnetz.h
index d541c2e..84ba965 100644
--- a/src/cnetz/cnetz.h
+++ b/src/cnetz/cnetz.h
@@ -139,7 +139,7 @@ int cnetz_channel_by_short_name(const char *short_name);
 const char *chan_type_short_name(enum cnetz_chan_type chan_type);
 const char *chan_type_long_name(enum cnetz_chan_type chan_type);
 int cnetz_init(void);
-int cnetz_create(const char *kanal, enum cnetz_chan_type chan_type, const char *audiodev, int use_sdr, enum demod_type demod, int samplerate, double rx_gain, double tx_gain, int challenge_valid, uint64_t challenge, int response_valid, uint64_t response, int warteschlange, int metering, double speech_deviation, int ms_power, int measure_speed, double clock_speed[2], int polarity, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback);
+int cnetz_create(const char *kanal, enum cnetz_chan_type chan_type, const char *device, int use_sdr, enum demod_type demod, int samplerate, double rx_gain, double tx_gain, int challenge_valid, uint64_t challenge, int response_valid, uint64_t response, int warteschlange, int metering, double speech_deviation, int ms_power, int measure_speed, double clock_speed[2], int polarity, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback);
 void cnetz_destroy(sender_t *sender);
 void cnetz_go_idle(cnetz_t *cnetz);
 void cnetz_sync_frame(cnetz_t *cnetz, double sync, int ts);
diff --git a/src/cnetz/main.c b/src/cnetz/main.c
index 6e35ddf..1575ac9 100644
--- a/src/cnetz/main.c
+++ b/src/cnetz/main.c
@@ -516,10 +516,10 @@ int main(int argc, char *argv[])
 		mandatory = 1;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 		/* set channel types for more than 1 channel */
 		if (num_kanal > 1 && num_chan_type == 0) {
 			chan_type[0] = CHAN_TYPE_OGK;
@@ -528,9 +528,9 @@ int main(int argc, char *argv[])
 			num_chan_type = num_kanal;
 		}
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
@@ -633,7 +633,7 @@ int main(int argc, char *argv[])
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = cnetz_create(kanal[i], chan_type[i], audiodev[i], use_sdr, demod, samplerate, rx_gain, tx_gain, challenge_valid, challenge, response_valid, response, warteschlange, metering, speech_deviation, ms_power, (i == 0) ? measure_speed : 0, clock_speed, polarity, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback);
+		rc = cnetz_create(kanal[i], chan_type[i], dsp_device[i], use_sdr, demod, dsp_samplerate, rx_gain, tx_gain, challenge_valid, challenge, response_valid, response, warteschlange, metering, speech_deviation, ms_power, (i == 0) ? measure_speed : 0, clock_speed, polarity, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Sender\" instance. Quitting!\n");
 			goto fail;
@@ -645,7 +645,7 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	main_mobile("cnetz", &quit, latency, interval, NULL, station_id, 7);
+	main_mobile("cnetz", &quit, NULL, station_id, 7);
 
 fail:
 	flush_db();
diff --git a/src/datenklo/datenklo.c b/src/datenklo/datenklo.c
index 4de7ced..13331d6 100644
--- a/src/datenklo/datenklo.c
+++ b/src/datenklo/datenklo.c
@@ -1381,7 +1381,7 @@ error:
 }
 
 /* open audio device of one or two datenlo_t instance */
-int datenklo_open_audio(datenklo_t *datenklo, const char *audiodev, int latency, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave)
+int datenklo_open_audio(datenklo_t *datenklo, const char *audiodev, int buffer, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave)
 {
 	int channels = 1;
 	int rc;
@@ -1390,12 +1390,12 @@ int datenklo_open_audio(datenklo_t *datenklo, const char *audiodev, int latency,
 	if (datenklo->slave)
 		channels = 2;
 
-	/* latency of send buffer in samples */
-	datenklo->latspl = datenklo->samplerate * latency / 1000;
+	/* size of send buffer in samples */
+	datenklo->buffer_size = datenklo->samplerate * buffer / 1000;
 
 #ifdef HAVE_ALSA
 	/* init sound */
-	datenklo->audio = sound_open(audiodev, NULL, NULL, NULL, channels, 0.0, datenklo->samplerate, datenklo->latspl, 1.0, 4000.0, 2.0);
+	datenklo->audio = sound_open(audiodev, NULL, NULL, NULL, channels, 0.0, datenklo->samplerate, datenklo->buffer_size, 1.0, 1.0, 4000.0, 2.0);
 	if (!datenklo->audio) {
 		PDEBUG(DDATENKLO, DEBUG_ERROR, "No sound device!\n");
 		return -EIO;
@@ -1484,8 +1484,8 @@ void datenklo_main(datenklo_t *datenklo, int loopback)
 	if (datenklo->slave)
 		num_chan = 2;
 
-	sample_t buff[num_chan][datenklo->latspl], *samples[num_chan];
-	uint8_t pbuff[num_chan][datenklo->latspl], *power[num_chan];
+	sample_t buff[num_chan][datenklo->buffer_size], *samples[num_chan];
+	uint8_t pbuff[num_chan][datenklo->buffer_size], *power[num_chan];
 	for (i = 0; i < num_chan; i++) {
 		samples[i] = buff[i];
 		power[i] = pbuff[i];
@@ -1524,7 +1524,7 @@ void datenklo_main(datenklo_t *datenklo, int loopback)
 		process_timer();
 
 #ifdef HAVE_ALSA
-		count = sound_read(datenklo->audio, samples, datenklo->latspl, num_chan, rf_level_db);
+		count = sound_read(datenklo->audio, samples, datenklo->buffer_size, num_chan, rf_level_db);
 		if (count < 0) {
 			PDEBUG(DDSP, DEBUG_ERROR, "Failed to read RX data from audio device (rc = %d)\n", count);
 			if (count == -EPIPE) {
@@ -1556,7 +1556,7 @@ void datenklo_main(datenklo_t *datenklo, int loopback)
 		}
 
 #ifdef HAVE_ALSA
-		count = sound_get_tosend(datenklo->audio, datenklo->latspl);
+		count = sound_get_tosend(datenklo->audio, datenklo->buffer_size);
 #else
 		count = samplerate / 1000;
 #endif
@@ -1576,7 +1576,7 @@ void datenklo_main(datenklo_t *datenklo, int loopback)
 		}
 		if (loopback) {
 			/* copy buffer to preserve original audio for later use */
-			sample_t lbuff[num_chan][datenklo->latspl];
+			sample_t lbuff[num_chan][datenklo->buffer_size];
 			memcpy(lbuff, buff, sizeof(lbuff));
 			if (loopback == 2 && num_chan == 2) {
 				/* swap */
diff --git a/src/datenklo/datenklo.h b/src/datenklo/datenklo.h
index 2b43ce7..31acf72 100644
--- a/src/datenklo/datenklo.h
+++ b/src/datenklo/datenklo.h
@@ -19,7 +19,7 @@ typedef struct datenklo {
 	double		force_tx_baud, force_rx_baud; /* override IOCTL */
 	int		tx_back, rx_back;	/* set if back channel is used for path */
 	int		samplerate;		/* audio sample rate */
-	int		latspl;			/* latenc */
+	int		buffer_size;		/* audio buffer size */
 	int		loopback;		/* loopback mode */
 
 	/* states */
@@ -86,7 +86,7 @@ typedef struct datenklo {
 
 void datenklo_main(datenklo_t *datenklo, int loopback);
 int datenklo_init(datenklo_t *datenklo, const char *dev_name, enum am791x_type am791x_type, uint8_t mc, int auto_rts, double force_tx_baud, double force_rx_baud, int samplerate, int loopback);
-int datenklo_open_audio(datenklo_t *datenklo, const char *audiodev, int latency, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave);
+int datenklo_open_audio(datenklo_t *datenklo, const char *audiodev, int buffer, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave);
 void datenklo_exit(datenklo_t *datenklo);
 void datenklo_init_global(void);
 
diff --git a/src/datenklo/main.c b/src/datenklo/main.c
index 4f3977b..43a0b74 100644
--- a/src/datenklo/main.c
+++ b/src/datenklo/main.c
@@ -61,8 +61,8 @@ static int tx_baudrate[MAX_DEVICES] = { 0 }, rx_baudrate[MAX_DEVICES] = { 0 };
 static int num_ttydev = 0;
 static const char *ttydev[MAX_DEVICES] = { "/dev/ttyDATENKLO0" };
 static const char *audiodev = "hw:0,0";
-static int samplerate = 48000;
-static int latency = 50;
+static int dsp_samplerate = 48000;
+static int dsp_buffer = 50;
 static int stereo = 0;
 static int loopback = 0;
 static int fast_math = 0;
@@ -102,9 +102,9 @@ void print_help(const char *arg0)
 	printf(" -a --audio-device hw:,\n");
 	printf("        Sound card and device number (default = '%s')\n", audiodev);
 	printf(" -s --samplerate \n");
-	printf("        Sample rate of sound device (default = '%d')\n", samplerate);
+	printf("        Sample rate of sound device (default = '%d')\n", dsp_samplerate);
 	printf(" -b --buffer \n");
-	printf("        How many milliseconds are processed in advance (default = '%d')\n", latency);
+	printf("        How many milliseconds are processed in advance (default = '%d')\n", dsp_buffer);
 	printf(" -l --loopback \n");
 	printf("        Perform audio loopback to test modem.\n");
 	printf("        type 1: Audio from transmitter is fed into receiver (analog loopback)\n");
@@ -208,10 +208,10 @@ static int handle_options(int short_option, int argi, char **argv)
 		audiodev = options_strdup(argv[argi]);
 		break;
 	case 's':
-		samplerate = atoi(argv[argi]);
+		dsp_samplerate = atoi(argv[argi]);
 		break;
 	case 'b':
-		latency = atoi(argv[argi]);
+		dsp_buffer = atoi(argv[argi]);
 		break;
 	case 'l':
 		loopback = atoi(argv[argi]);
@@ -298,7 +298,7 @@ int main(int argc, char *argv[])
 		/* increment last name */
 		if (i && ttydev[i] == NULL)
 			ttydev[i] = inc_dev_name(ttydev[i - 1]);
-		rc = datenklo_init(&datenklo[i], ttydev[i], am791x_type, mc[i], auto_rts, tx_baudrate[i], rx_baudrate[i], samplerate, loopback);
+		rc = datenklo_init(&datenklo[i], ttydev[i], am791x_type, mc[i], auto_rts, tx_baudrate[i], rx_baudrate[i], dsp_samplerate, loopback);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Datenklo\" instance. Quitting!\n");
 			goto fail;
@@ -308,7 +308,7 @@ int main(int argc, char *argv[])
 		printf("Datenklo on device '/dev/%s' ready. (using sound device '%s')\n", ttydev[i], audiodev);
 	}
 
-	rc = datenklo_open_audio(&datenklo[0], audiodev, latency, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave);
+	rc = datenklo_open_audio(&datenklo[0], audiodev, dsp_buffer, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave);
 	if (rc < 0) {
 		fprintf(stderr, "Failed to initialize audio. Quitting!\n");
 		goto fail;
diff --git a/src/eurosignal/eurosignal.c b/src/eurosignal/eurosignal.c
index 5bfaddd..1aa5815 100644
--- a/src/eurosignal/eurosignal.c
+++ b/src/eurosignal/eurosignal.c
@@ -237,7 +237,7 @@ void euro_exit(void)
 static void call_timeout(struct timer *timer);
 
 /* Create transceiver instance and link to a list. */
-int euro_create(const char *kanal, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int fm, int tx, int rx, int repeat, int degraded, int random, uint32_t scan_from, uint32_t scan_to, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback)
+int euro_create(const char *kanal, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int fm, int tx, int rx, int repeat, int degraded, int random, uint32_t scan_from, uint32_t scan_to, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback)
 {
 	euro_t *euro;
 	int rc;
@@ -261,7 +261,7 @@ int euro_create(const char *kanal, const char *audiodev, int use_sdr, int sample
 	PDEBUG(DEURO, DEBUG_DEBUG, "Creating 'Eurosignal' instance for 'Kanal' = %s (sample rate %d).\n", kanal, samplerate);
 
 	/* init general part of transceiver */
-	rc = sender_create(&euro->sender, kanal, euro_kanal2freq(kanal, fm), euro_kanal2freq(kanal, fm), audiodev, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&euro->sender, kanal, euro_kanal2freq(kanal, fm), euro_kanal2freq(kanal, fm), device, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DEURO, DEBUG_ERROR, "Failed to init transceiver process!\n");
 		goto error;
diff --git a/src/eurosignal/eurosignal.h b/src/eurosignal/eurosignal.h
index 5e28dba..bcb2bc1 100644
--- a/src/eurosignal/eurosignal.h
+++ b/src/eurosignal/eurosignal.h
@@ -82,7 +82,7 @@ double euro_kanal2freq(const char *kanal, int fm);
 void euro_list_channels(void);
 int euro_init(void);
 void euro_exit(void);
-int euro_create(const char *kanal, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int fm, int tx, int rx, int repeat, int degraded, int random, uint32_t scan_from, uint32_t scan_to, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback);
+int euro_create(const char *kanal, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int fm, int tx, int rx, int repeat, int degraded, int random, uint32_t scan_from, uint32_t scan_to, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback);
 void euro_destroy(sender_t *sender);
 void euro_get_id(euro_t *euro, char *id);
 void euro_receive_id(euro_t *euro, char *id);
diff --git a/src/eurosignal/main.c b/src/eurosignal/main.c
index dcc19a9..fde8011 100644
--- a/src/eurosignal/main.c
+++ b/src/eurosignal/main.c
@@ -208,21 +208,21 @@ int main(int argc, char *argv[])
 		goto fail;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
 
 	/* inits */
 	fm_init(fast_math);
-	dsp_init(samplerate);
+	dsp_init(dsp_samplerate);
 	euro_init();
 
 	/* TX is default */
@@ -231,7 +231,7 @@ int main(int argc, char *argv[])
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = euro_create(kanal[i], audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, fm, tx, rx, repeat, degraded, random_id, scan_from, scan_to, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback);
+		rc = euro_create(kanal[i], dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, fm, tx, rx, repeat, degraded, random_id, scan_from, scan_to, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Sender\" instance. Quitting!\n");
 			goto fail;
@@ -239,7 +239,7 @@ int main(int argc, char *argv[])
 		printf("Base station for channel %s ready, please tune transmitter and/or receiver to %.4f MHz\n", kanal[i], euro_kanal2freq(kanal[i], fm) / 1e6);
 	}
 
-	main_mobile("eurosignal", &quit, latency, interval, NULL, station_id, 6);
+	main_mobile("eurosignal", &quit, NULL, station_id, 6);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/fuvst/main.c b/src/fuvst/main.c
index f37fcfe..c7b89db 100755
--- a/src/fuvst/main.c
+++ b/src/fuvst/main.c
@@ -195,9 +195,9 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		return -EINVAL;
 	}
@@ -231,7 +231,7 @@ int main(int argc, char *argv[])
 	fm_init(fast_math);
 
 	for (i = 0; i < num_kanal; i++) {
-		rc = fuvst_create(kanal[i], chan_type[i], audiodev[i], samplerate, rx_gain, tx_gain, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, ignore_link_monitor, sio, uele_pc, fuko_pc);
+		rc = fuvst_create(kanal[i], chan_type[i], dsp_device[i], dsp_samplerate, rx_gain, tx_gain, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, ignore_link_monitor, sio, uele_pc, fuko_pc);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Kanal\" instance. Quitting!\n");
 			goto fail;
@@ -270,7 +270,7 @@ int main(int argc, char *argv[])
 	if (config_loaded)
 		printf("BS-Config: %s\n", config_name);
 
-	main_mobile("fuvst", &quit, latency, interval, NULL, station_id, 7);
+	main_mobile("fuvst", &quit, NULL, station_id, 7);
 fail:
 
 	/* destroy transceiver instance */
diff --git a/src/fuvst/sniffer.c b/src/fuvst/sniffer.c
index 69ff963..5ca78f3 100644
--- a/src/fuvst/sniffer.c
+++ b/src/fuvst/sniffer.c
@@ -198,17 +198,17 @@ int main(int argc, char *argv[])
 		goto fail;
 	}
 
-	if (num_audiodev <= 1)
-		audiodev[1] = audiodev[0];
+	if (num_device <= 1)
+		dsp_device[1] = dsp_device[0];
 	for (i = 0; i < num_kanal; i++) {
-		PDEBUG(DCNETZ, DEBUG_DEBUG, "Creating 'Sniffer' instance for 'Kanal' = %s (sample rate %d).\n", kanal[i], samplerate);
+		PDEBUG(DCNETZ, DEBUG_DEBUG, "Creating 'Sniffer' instance for 'Kanal' = %s (sample rate %d).\n", kanal[i], dsp_samplerate);
 
 		sniffer = calloc(1, sizeof(sniffer_t));
 		if (!sniffer) {
 			PDEBUG(DCNETZ, DEBUG_ERROR, "No memory!\n");
 			goto fail;
 		}
-		rc = sender_create(&sniffer->sender, kanal[i], 131, 131, audiodev[i], 0, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+		rc = sender_create(&sniffer->sender, kanal[i], 131, 131, dsp_device[i], 0, dsp_samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Sniffer\" instance. Quitting!\n");
 			goto fail;
@@ -220,12 +220,12 @@ int main(int argc, char *argv[])
 
 		sender_set_fm(&sniffer->sender, 1.0, 4000.0, 1.0, 1.0);
 
-		rc = v27_modem_init(&sniffer->modem, sniffer, send_bit, receive_bit, samplerate, 1);
+		rc = v27_modem_init(&sniffer->modem, sniffer, send_bit, receive_bit, dsp_samplerate, 1);
 		if (rc < 0)
 			goto fail;
 	}
 
-	main_mobile(NULL, &quit, latency, interval, NULL, NULL, 0);
+	main_mobile(NULL, &quit, NULL, NULL, 0);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/imts/dialer.c b/src/imts/dialer.c
index 1336145..f7f2edb 100644
--- a/src/imts/dialer.c
+++ b/src/imts/dialer.c
@@ -35,10 +35,10 @@
 /* presets */
 const char *station_id = "6681739";
 const char *dialing;
-const char *audiodev = "hw:0,0";
-int samplerate = 48000;
+const char *dsp_audiodev = "hw:0,0";
+int dsp_samplerate = 48000;
 const char *write_tx_wave = NULL;
-int latency = 50;
+int dsp_buffer = 50;
 
 #define TONE_DONE	-1
 #define TONE_SILENCE	0
@@ -53,7 +53,6 @@ static struct dial_string {
 	int length;
 } dial_string[2048];
 static int dial_pos = 0;
-static int latspl;
 
 /* instances */
 #ifdef HAVE_ALSA
@@ -82,10 +81,10 @@ static void print_help(const char *arg0)
 	printf("        7 Digits of ID of mobile station (default = '%s')\n", station_id);
 #ifdef HAVE_ALSA
 	printf(" -a --audio-device hw:,\n");
-	printf("        Sound card and device number (default = '%s')\n", audiodev);
+	printf("        Sound card and device number (default = '%s')\n", dsp_audiodev);
 #endif
 	printf(" -s --samplerate \n");
-	printf("        Sample rate of sound device (default = '%d')\n", samplerate);
+	printf("        Sample rate of sound device (default = '%d')\n", dsp_samplerate);
 	printf(" -w --write-tx-wave \n");
 	printf("        Write audio to given wave file also.\n");
 }
@@ -109,10 +108,10 @@ static int handle_options(int short_option, int __attribute__((unused)) argi, ch
 		station_id = options_strdup(argv[argi]);
 		break;
 	case 'a':
-		audiodev = options_strdup(argv[argi]);
+		dsp_audiodev = options_strdup(argv[argi]);
 		break;
 	case 's':
-		samplerate = atoi(argv[argi]);
+		dsp_samplerate = atoi(argv[argi]);
 		break;
 	case 'w':
 		write_tx_wave = options_strdup(argv[argi]);
@@ -148,7 +147,7 @@ again:
 	default:
 		for (i = 0; i < count; i++) {
 			samples[i] = cos(2.0 * M_PI * (double)dial_string[dial_pos].tone * phase);
-			phase += 1.0 / samplerate;
+			phase += 1.0 / dsp_samplerate;
 		}
 	}
 
@@ -173,18 +172,18 @@ again:
 /* loop that gets audio from encoder and forwards it to sound card.
  * alternatively a sound file is written.
  */
-static void process_signal(void)
+static void process_signal(int buffer_size)
 {
-	sample_t buff[latspl], *samples[1] = { buff };
-        uint8_t pbuff[latspl], *power[1] = { pbuff };
+	sample_t buff[buffer_size], *samples[1] = { buff };
+        uint8_t pbuff[buffer_size], *power[1] = { pbuff };
 	int count;
 	int __attribute__((unused)) rc;
 
 	while (dial_string[dial_pos].tone != TONE_DONE) {
 #ifdef HAVE_ALSA
-		count = sound_get_tosend(audio, latspl);
+		count = sound_get_tosend(audio, buffer_size);
 #else
-		count = samplerate / 1000;
+		count = dsp_samplerate / 1000;
 #endif
 		if (count < 0) {
 			PDEBUG(DDSP, DEBUG_ERROR, "Failed to get number of samples in buffer (rc = %d)!\n", count);
@@ -215,12 +214,13 @@ static void process_signal(void)
 int main(int argc, char *argv[])
 {
 	int i, d, p, pulses, tone = 0;
+	int buffer_size;
 	int rc, argi;
 
 	memset(dial_string, 0, sizeof(dial_string));
 
-	/* latency of send buffer in samples */
-	latspl = samplerate * latency / 1000;
+	/* size of send buffer in samples */
+	buffer_size = dsp_samplerate * dsp_buffer / 1000;
 
 	/* handle options / config file */
 	add_options();
@@ -248,7 +248,7 @@ int main(int argc, char *argv[])
 
 	dialing = argv[argi];
 	d = 0;
-	dial_string[d].tone = TONE_SILENCE; dial_string[d++].length = 0.600 * (double)samplerate; /* pause */
+	dial_string[d].tone = TONE_SILENCE; dial_string[d++].length = 0.600 * (double)dsp_samplerate; /* pause */
 	if (!!strcasecmp(dialing, "disconnect")) {
 		/* check for valid phone number */
 		if (strlen(dialing) > 64) {
@@ -262,11 +262,11 @@ int main(int argc, char *argv[])
 			}
 		}
 
-		dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 0.350 * (double)samplerate; /* off-hook */
+		dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 0.350 * (double)dsp_samplerate; /* off-hook */
 		dial_string[d].console = 's';
-		dial_string[d].tone = TONE_CONNECT; dial_string[d++].length = 0.050 * (double)samplerate; /* seize */
+		dial_string[d].tone = TONE_CONNECT; dial_string[d++].length = 0.050 * (double)dsp_samplerate; /* seize */
 		dial_string[d].console = '-';
-		dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 1.000 * (double)samplerate; /* pause */
+		dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 1.000 * (double)dsp_samplerate; /* pause */
 		for (i = 0; station_id[i]; i++) {
 			pulses = station_id[i] - '0';
 			if (pulses == 0)
@@ -277,37 +277,37 @@ int main(int argc, char *argv[])
 					tone = TONE_SILENCE;
 				else
 					tone = TONE_GUARD;
-				dial_string[d].tone = TONE_CONNECT; dial_string[d++].length = 0.025 * (double)samplerate; /* mark */
-				dial_string[d].tone = tone; dial_string[d++].length = 0.025 * (double)samplerate; /* space */
+				dial_string[d].tone = TONE_CONNECT; dial_string[d++].length = 0.025 * (double)dsp_samplerate; /* mark */
+				dial_string[d].tone = tone; dial_string[d++].length = 0.025 * (double)dsp_samplerate; /* space */
 			}
-			dial_string[d].tone = tone; dial_string[d++].length = 0.190 * (double)samplerate; /* after digit */
+			dial_string[d].tone = tone; dial_string[d++].length = 0.190 * (double)dsp_samplerate; /* after digit */
 		}
 		dial_string[d].console = '-';
-		dial_string[d].tone = TONE_SILENCE; dial_string[d++].length = 2.000 * (double)samplerate; /* pause */
+		dial_string[d].tone = TONE_SILENCE; dial_string[d++].length = 2.000 * (double)dsp_samplerate; /* pause */
 		for (i = 0; dialing[i]; i++) {
 			pulses = dialing[i] - '0';
 			if (pulses == 0)
 				pulses = 10;
 			dial_string[d].console = dialing[i];
 			for (p = 1; p <= pulses; p++) {
-				dial_string[d].tone = TONE_CONNECT; dial_string[d++].length = 0.060 * (double)samplerate; /* mark */
-				dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 0.040 * (double)samplerate; /* space */
+				dial_string[d].tone = TONE_CONNECT; dial_string[d++].length = 0.060 * (double)dsp_samplerate; /* mark */
+				dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 0.040 * (double)dsp_samplerate; /* space */
 			}
-			dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 0.400 * (double)samplerate; /* after digit */
+			dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 0.400 * (double)dsp_samplerate; /* after digit */
 		}
 		dial_string[d].console = '\n';
 	} else {
 		for (i = 0; i < 750; i += 50) {
-			dial_string[d].tone = TONE_DISCONNECT; dial_string[d++].length = 0.025 * (double)samplerate; /* mark */
-			dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 0.025 * (double)samplerate; /* space */
+			dial_string[d].tone = TONE_DISCONNECT; dial_string[d++].length = 0.025 * (double)dsp_samplerate; /* mark */
+			dial_string[d].tone = TONE_GUARD; dial_string[d++].length = 0.025 * (double)dsp_samplerate; /* space */
 		}
 	}
-	dial_string[d].tone = TONE_SILENCE; dial_string[d++].length = 0.600 * (double)samplerate; /* pause */
+	dial_string[d].tone = TONE_SILENCE; dial_string[d++].length = 0.600 * (double)dsp_samplerate; /* pause */
 	dial_string[d].tone = TONE_DONE; dial_string[d++].length = 0; /* end */
 
 #ifdef HAVE_ALSA
 	/* init sound */
-	audio = sound_open(audiodev, NULL, NULL, NULL, 1, 0.0, samplerate, latspl, 1.0, 4000.0, 2.0);
+	audio = sound_open(dsp_audiodev, NULL, NULL, NULL, 1, 0.0, dsp_samplerate, dsp_buffer, 1.0, 1.0, 4000.0, 2.0);
 	if (!audio) {
 		PDEBUG(DBNETZ, DEBUG_ERROR, "No sound device!\n");
 		goto exit;
@@ -316,7 +316,7 @@ int main(int argc, char *argv[])
 
 	/* open wave */
 	if (write_tx_wave) {
-		rc = wave_create_record(&wave_tx_rec, write_tx_wave, samplerate, 1, 1.0);
+		rc = wave_create_record(&wave_tx_rec, write_tx_wave, dsp_samplerate, 1, 1.0);
 		if (rc < 0) {
 			PDEBUG(DBNETZ, DEBUG_ERROR, "Failed to create WAVE recoding instance!\n");
 			goto exit;
@@ -336,7 +336,7 @@ int main(int argc, char *argv[])
 
 	PDEBUG(DBNETZ, DEBUG_ERROR, "Start audio after pause...\n");
 
-	process_signal();
+	process_signal(buffer_size);
 
 exit:
 	/* close wave */
diff --git a/src/imts/imts.c b/src/imts/imts.c
index 4d48346..2f6d9cd 100644
--- a/src/imts/imts.c
+++ b/src/imts/imts.c
@@ -274,7 +274,7 @@ static void imts_paging(imts_t *imts, const char *dial_string, int loopback);
 static void imts_detector_test(imts_t *imts, double length_1, double length_2, double length_3);
 
 /* Create transceiver instance and link to a list. */
-int imts_create(const char *kanal, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, int ptt, int station_length, double fast_seize, enum mode mode, const char *operator, double length_1, double length_2, double length_3)
+int imts_create(const char *kanal, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, int ptt, int station_length, double fast_seize, enum mode mode, const char *operator, double length_1, double length_2, double length_3)
 {
 	imts_t *imts;
 	int rc;
@@ -317,7 +317,7 @@ int imts_create(const char *kanal, const char *audiodev, int use_sdr, int sample
 
 	/* init general part of transceiver */
 	/* do not enable emphasis, since it is done by imts code, not by common sender code */
-	rc = sender_create(&imts->sender, kanal, imts_channel2freq(kanal, 0), imts_channel2freq(kanal, 1), audiodev, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&imts->sender, kanal, imts_channel2freq(kanal, 0), imts_channel2freq(kanal, 1), device, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DIMTS, DEBUG_ERROR, "Failed to init 'Sender' processing!\n");
 		goto error;
diff --git a/src/imts/imts.h b/src/imts/imts.h
index 0e29cc8..efd33f6 100644
--- a/src/imts/imts.h
+++ b/src/imts/imts.h
@@ -129,7 +129,7 @@ typedef struct imts {
 void imts_list_channels(void);
 double imts_channel2freq(const char *kanal, int uplink);
 int imts_init(void);
-int imts_create(const char *channel, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, int ptt, int station_length, double fast_seize, enum mode mode, const char *operator, double length_1, double length_2, double length_3);
+int imts_create(const char *channel, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, int ptt, int station_length, double fast_seize, enum mode mode, const char *operator, double length_1, double length_2, double length_3);
 void imts_destroy(sender_t *sender);
 void imts_loss_indication(imts_t *imts, double loss_time);
 void imts_signal_indication(imts_t *imts);
diff --git a/src/imts/main.c b/src/imts/main.c
index d3d7230..1b4ebb3 100644
--- a/src/imts/main.c
+++ b/src/imts/main.c
@@ -50,7 +50,7 @@ static double detector_test_length_3 = 0.0;
 
 void print_help(const char *arg0)
 {
-	main_mobile_print_help(arg0, "-b 5 ");
+	main_mobile_print_help(arg0, "-b 5 -i 0.1 ");
 	/*      -                                                                             - */
 	printf(" -S --squelch  | auto\n");
 	printf("        Use given RF level to detect loss of signal. When the signal gets lost\n");
@@ -199,14 +199,14 @@ int main(int argc, char *argv[])
 		goto fail;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
@@ -226,10 +226,10 @@ int main(int argc, char *argv[])
 		fprintf(stderr, "*******************************************************************************\n");
 	}
 
-	if (mode == MODE_IMTS && !fast_seize && latency > 5 && loopback == 0) {
+	if (mode == MODE_IMTS && !fast_seize && dsp_buffer > 5 && loopback == 0) {
 		fprintf(stderr, "*******************************************************************************\n");
 		fprintf(stderr, "It is required to have a low latency in order to respond to phone's seizure\n");
-		fprintf(stderr, "fast enough! Please reduce buffer size to 5 ms via option: '-b 5'\n");
+		fprintf(stderr, "fast enough! Please reduce buffer size to 5 ms via option: '-b 5 -i 0.1'\n");
 		fprintf(stderr, "If this causes buffer underruns, use the 'Fast Seize' mode, see help.\n");
 		fprintf(stderr, "*******************************************************************************\n");
 		exit(0);
@@ -266,7 +266,7 @@ int main(int argc, char *argv[])
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = imts_create(kanal[i], audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, ptt, station_length, fast_seize, mode, operator, detector_test_length_1, detector_test_length_2, detector_test_length_3);
+		rc = imts_create(kanal[i], dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, ptt, station_length, fast_seize, mode, operator, detector_test_length_1, detector_test_length_2, detector_test_length_3);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create \"Sender\" instance. Quitting!\n");
 			goto fail;
@@ -274,7 +274,7 @@ int main(int argc, char *argv[])
 		printf("Base station on channel %s ready, please tune transmitter to %.3f MHz and receiver to %.3f MHz. (%.3f MHz offset)\n", kanal[i], imts_channel2freq(kanal[i], 0) / 1e6, imts_channel2freq(kanal[i], 1) / 1e6, imts_channel2freq(kanal[i], 2) / 1e6);
 	}
 
-	main_mobile((mode == MODE_IMTS) ? "imts" : "mts", &quit, latency, interval, NULL, station_id, station_length);
+	main_mobile((mode == MODE_IMTS) ? "imts" : "mts", &quit, NULL, station_id, station_length);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/jolly/jolly.c b/src/jolly/jolly.c
index cd037df..d5cf323 100644
--- a/src/jolly/jolly.c
+++ b/src/jolly/jolly.c
@@ -209,7 +209,7 @@ static void jolly_speech_timeout(struct timer *timer);
 static void jolly_go_idle(jolly_t *jolly);
 
 /* Create transceiver instance and link to a list. */
-int jolly_create(const char *kanal, double dl_freq, double ul_freq, double step, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, int nbfm, int repeater)
+int jolly_create(const char *kanal, double dl_freq, double ul_freq, double step, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, int nbfm, int repeater)
 {
 	jolly_t *jolly;
 	int rc;
@@ -226,7 +226,7 @@ int jolly_create(const char *kanal, double dl_freq, double ul_freq, double step,
 	ul_freq = ul_freq * 1e6 + step * 1e3 * (double)atoi(kanal);
 
 	/* init general part of transceiver */
-	rc = sender_create(&jolly->sender, kanal, dl_freq, ul_freq, audiodev, use_sdr, samplerate, rx_gain, tx_gain, pre_emphasis, de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&jolly->sender, kanal, dl_freq, ul_freq, device, use_sdr, samplerate, rx_gain, tx_gain, pre_emphasis, de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DJOLLY, DEBUG_ERROR, "Failed to init 'Sender' processing!\n");
 		goto error;
diff --git a/src/jolly/jolly.h b/src/jolly/jolly.h
index 15ea158..226cb61 100644
--- a/src/jolly/jolly.h
+++ b/src/jolly/jolly.h
@@ -50,7 +50,7 @@ typedef struct jolly {
 	int			delay_max;		/* number of samples in delay buffer */
 } jolly_t;
 
-int jolly_create(const char *kanal, double dl_freq, double ul_freq, double step, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, int nbfm, int repeater);
+int jolly_create(const char *kanal, double dl_freq, double ul_freq, double step, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db, int nbfm, int repeater);
 void jolly_destroy(sender_t *sender);
 void speech_finished(jolly_t *jolly);
 void jolly_receive_dtmf(void *priv, char digit, dtmf_meas_t *meas);
diff --git a/src/jolly/main.c b/src/jolly/main.c
index b8ed825..c910069 100644
--- a/src/jolly/main.c
+++ b/src/jolly/main.c
@@ -154,14 +154,14 @@ int main(int argc, char *argv[])
 		mandatory = 1;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
@@ -185,12 +185,12 @@ int main(int argc, char *argv[])
 
 	/* inits */
 	fm_init(fast_math);
-	init_voice(samplerate);
+	init_voice(dsp_samplerate);
 	dsp_init();
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = jolly_create(kanal[i], dl_freq, ul_freq, step, audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, nbfm, repeater);
+		rc = jolly_create(kanal[i], dl_freq, ul_freq, step, dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db, nbfm, repeater);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create transceiver instance. Quitting!\n");
 			goto fail;
@@ -198,7 +198,7 @@ int main(int argc, char *argv[])
 		printf("base station on channel %s ready, please tune transmitter to %.4f MHz and receiver to %.4f MHz. (%.4f MHz offset)\n", kanal[i], dl_freq + step / 1e3 * (double)atoi(kanal[i]), ul_freq + step / 1e3 * (double)atoi(kanal[i]), ul_freq - dl_freq);
 	}
 
-	main_mobile("jollycom", &quit, latency, interval, NULL, station_id, 4);
+	main_mobile("jollycom", &quit, NULL, station_id, 4);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/libmobile/console.c b/src/libmobile/console.c
index a1198a9..fbb9458 100644
--- a/src/libmobile/console.c
+++ b/src/libmobile/console.c
@@ -71,7 +71,7 @@ typedef struct console {
 	char audiodev[64];	/* headphone interface, if used */
 	int samplerate;		/* sample rate of headphone interface */
 	void *sound;		/* headphone interface */
-	int latspl;		/* sample latency at headphone interface */
+	int buffer_size;	/* sample buffer size at headphone interface */
 	samplerate_t srstate;	/* patterns/announcement upsampling */
 	jitter_t dejitter;	/* headphone audio dejittering */
 	int test_audio_pos;	/* position for test tone toward mobile */
@@ -358,7 +358,7 @@ static void _print_console_text(void)
 	printf("\033[0;39m");
 }
 
-int console_init(const char *station_id, const char *audiodev, int samplerate, int latency, int num_digits, int loopback, int echo_test, const char *digits)
+int console_init(const char *station_id, const char *audiodev, int samplerate, int buffer, int num_digits, int loopback, int echo_test, const char *digits)
 {
 	int rc = 0;
 
@@ -372,7 +372,7 @@ int console_init(const char *station_id, const char *audiodev, int samplerate, i
 		strncpy(console.station_id, station_id, sizeof(console.station_id) - 1);
 	strncpy(console.audiodev, audiodev, sizeof(console.audiodev) - 1);
 	console.samplerate = samplerate;
-	console.latspl = latency * samplerate / 1000;
+	console.buffer_size = buffer * samplerate / 1000;
 	console.num_digits = num_digits;
 	console.loopback = loopback;
 	console.echo_test = echo_test;
@@ -400,7 +400,7 @@ error:
 	return rc;
 }
 
-int console_open_audio(int __attribute__((unused)) latspl)
+int console_open_audio(int __attribute__((unused)) buffer_size, double __attribute__((unused)) interval)
 {
 	if (!console.audiodev[0])
 		return 0;
@@ -408,7 +408,7 @@ int console_open_audio(int __attribute__((unused)) latspl)
 #ifdef HAVE_ALSA
 	/* open sound device for call control */
 	/* use factor 1.4 of speech level for complete range of sound card */
-	console.sound = sound_open(console.audiodev, NULL, NULL, NULL, 1, 0.0, console.samplerate, latspl, 1.4, 4000.0, 2.0);
+	console.sound = sound_open(console.audiodev, NULL, NULL, NULL, 1, 0.0, console.samplerate, buffer_size, interval, 1.4, 4000.0, 2.0);
 	if (!console.sound) {
 		PDEBUG(DSENDER, DEBUG_ERROR, "No sound device!\n");
 		return -EIO;
@@ -547,12 +547,12 @@ void process_console(int c)
 
 #ifdef HAVE_ALSA
 	/* handle audio, if sound device is used */
-	sample_t samples[console.latspl + 10], *samples_list[1];
+	sample_t samples[console.buffer_size + 10], *samples_list[1];
 	uint8_t *power_list[1];
 	int count;
 	int rc;
 
-	count = sound_get_tosend(console.sound, console.latspl);
+	count = sound_get_tosend(console.sound, console.buffer_size);
 	if (count < 0) {
 		PDEBUG(DSENDER, DEBUG_ERROR, "Failed to get samples in buffer (rc = %d)!\n", count);
 		if (count == -EPIPE)
@@ -572,7 +572,7 @@ void process_console(int c)
 		}
 	}
 	samples_list[0] = samples;
-	count = sound_read(console.sound, samples_list, console.latspl, 1, NULL);
+	count = sound_read(console.sound, samples_list, console.buffer_size, 1, NULL);
 	if (count < 0) {
 		PDEBUG(DSENDER, DEBUG_ERROR, "Failed to read from sound device (rc = %d)!\n", count);
 		if (count == -EPIPE)
diff --git a/src/libmobile/console.h b/src/libmobile/console.h
index c90886f..a54edc0 100644
--- a/src/libmobile/console.h
+++ b/src/libmobile/console.h
@@ -1,8 +1,8 @@
 
 void console_msg(osmo_cc_call_t *call, osmo_cc_msg_t *msg);
-int console_init(const char *station_id, const char *audiodev, int samplerate, int latency, int dial_digits, int loopback, int echo_test, const char *digits);
+int console_init(const char *station_id, const char *audiodev, int samplerate, int buffer, int dial_digits, int loopback, int echo_test, const char *digits);
 void console_cleanup(void);
-int console_open_audio(int latspl);
+int console_open_audio(int buffer_size, double interval);
 int console_start_audio(void);
 void console_process(int c);
 void process_console(int c);
diff --git a/src/libmobile/main_mobile.c b/src/libmobile/main_mobile.c
index 8789cf4..e2513d9 100644
--- a/src/libmobile/main_mobile.c
+++ b/src/libmobile/main_mobile.c
@@ -50,15 +50,16 @@ static int got_init = 0;
 /* common mobile settings */
 int num_kanal = 0;
 const char *kanal[MAX_SENDER];
-int num_audiodev = 0;
-const char *audiodev[MAX_SENDER] = { "hw:0,0" };
+int num_device = 0;
+const char *dsp_device[MAX_SENDER] = { "hw:0,0" };
 int allow_sdr = 1;
 int use_sdr = 0;
-static const char *call_audiodev = "";
-int samplerate = 48000;
+int dsp_samplerate = 48000;
+double dsp_interval = 1.0;
+int dsp_buffer = 50;
+static const char *call_device = "";
 static int call_samplerate = 48000;
-int interval = 1;
-int latency = 50;
+static int call_buffer = 50;
 int uses_emphasis = 1;
 int do_pre_emphasis = 0;
 int do_de_emphasis = 0;
@@ -106,16 +107,17 @@ void main_mobile_print_help(const char *arg0, const char *ext_usage)
 	printf(" -k --channel \n");
 	printf("        Channel (German = Kanal) number of \"Sender\" (German = Transceiver)\n");
 	printf(" -a --audio-device hw:,\n");
-	printf("        Sound card and device number (default = '%s')\n", audiodev[0]);
+	printf("        Sound card and device number (default = '%s')\n", dsp_device[0]);
 	printf("        Don't set it for SDR!\n");
 	printf(" -s --samplerate \n");
-	printf("        Sample rate of sound device (default = '%d')\n", samplerate);
-	printf(" -i --interval 1..25\n");
-	printf("        Interval of processing loop in ms (default = '%d' ms)\n", interval);
-	printf("        Use 25 to drastically reduce CPU usage. In case of buffer underrun,\n");
-	printf("        increase latency accordingly.\n");
+	printf("        Sample rate of sound device (default = '%d')\n", dsp_samplerate);
+	printf(" -i --interval 0.1..25\n");
+	printf("        Interval of processing loop in ms (default = '%.1f' ms)\n", dsp_interval);
+	printf("        Use 10 to drastically reduce CPU usage. In case of buffer underrun,\n");
+	printf("        increase buffer accordingly.\n");
 	printf(" -b --buffer \n");
-	printf("        How many milliseconds are processed in advance (default = '%d')\n", latency);
+	printf("        How many milliseconds are processed in advance (default = '%d')\n", dsp_buffer);
+	printf("        A buffer below 10 ms requires low interval like 0.1 ms.\n");
     if (uses_emphasis) {
 	printf(" -p --pre-emphasis\n");
 	printf("        Enable pre-emphasis, if you directly connect to the oscillator of the\n");
@@ -134,9 +136,11 @@ void main_mobile_print_help(const char *arg0, const char *ext_usage)
 	printf("        Use echo test, to send back audio from mobile phone's microphone to\n");
 	printf("        the speaker. (German: 'Blasprobe').\n");
 	printf(" -c --call-device hw:,\n");
-	printf("        Sound card and device number for headset (default = '%s')\n", call_audiodev);
+	printf("        Sound card and device number for headset (default = '%s')\n", call_device);
 	printf("    --call-samplerate \n");
 	printf("        Sample rate of sound device for headset (default = '%d')\n", call_samplerate);
+	printf("    --call-buffer \n");
+	printf("        How many milliseconds are processed in advance (default = '%d')\n", call_buffer);
 	printf(" -x --osmocc-cross\n");
 	printf("        Enable built-in call forwarding between mobiles. Be sure to have\n");
 	printf("        at least one control channel and two voice channels. Alternatively\n");
@@ -198,7 +202,8 @@ void main_mobile_print_hotkeys(void)
 #define	OPT_READ_RX_WAVE	1006
 #define	OPT_READ_TX_WAVE	1007
 #define	OPT_CALL_SAMPLERATE	1008
-#define	OPT_FAST_MATH		1009
+#define	OPT_CALL_BUFFER		1009
+#define	OPT_FAST_MATH		1010
 #define	OPT_LIMESDR		1100
 #define	OPT_LIMESDR_MINI	1101
 
@@ -222,6 +227,7 @@ void main_mobile_add_options(void)
 	option_add(OPT_OSMO_CC, "cc", 1);
 	option_add('c', "call-device", 1);
 	option_add(OPT_CALL_SAMPLERATE, "call-samplerate", 1);
+	option_add(OPT_CALL_BUFFER, "call-buffer", 1);
 	option_add('t', "tones", 1);
 	option_add('l', "loopback", 1);
 	option_add('r', "realtime", 1);
@@ -264,20 +270,20 @@ int main_mobile_handle_options(int short_option, int argi, char **argv)
 		OPT_ARRAY(num_kanal, kanal, argv[argi])
 		break;
 	case 'a':
-		OPT_ARRAY(num_audiodev, audiodev, options_strdup(argv[argi]))
+		OPT_ARRAY(num_device, dsp_device, options_strdup(argv[argi]))
 		break;
 	case 's':
-		samplerate = atoi(argv[argi]);
+		dsp_samplerate = atoi(argv[argi]);
 		break;
 	case 'i':
-		interval = atoi(argv[argi]);
-		if (interval < 1)
-			interval = 1;
-		if (interval > 25)
-			interval = 25;
+		dsp_interval = atof(argv[argi]);
+		if (dsp_interval < 0.1)
+			dsp_interval = 0.1;
+		if (dsp_interval > 10)
+			dsp_interval = 10;
 		break;
 	case 'b':
-		latency = atoi(argv[argi]);
+		dsp_buffer = atoi(argv[argi]);
 		break;
 	case 'p':
 		if (!uses_emphasis) {
@@ -321,11 +327,14 @@ int main_mobile_handle_options(int short_option, int argi, char **argv)
 		cc_argv[cc_argc++] = options_strdup(argv[argi]);
 		break;
 	case 'c':
-		call_audiodev = options_strdup(argv[argi]);
+		call_device = options_strdup(argv[argi]);
 		break;
 	case OPT_CALL_SAMPLERATE:
 		call_samplerate = atoi(argv[argi]);
 		break;
+	case OPT_CALL_BUFFER:
+		call_buffer = atoi(argv[argi]);
+		break;
 	case 't':
 		send_patterns = atoi(argv[argi]);
 		break;
@@ -431,9 +440,9 @@ static int get_char()
 }
 
 /* Loop through all transceiver instances of one network. */
-void main_mobile(const char *name, int *quit, int latency, int interval, void (*myhandler)(void), const char *station_id, int station_id_digits)
+void main_mobile(const char *name, int *quit, void (*myhandler)(void), const char *station_id, int station_id_digits)
 {
-	int latspl;
+	int buffer_size;
 	sender_t *sender;
 	double last_time_call = 0, begin_time, now, sleep;
 	struct termios term, term_orig;
@@ -445,8 +454,8 @@ void main_mobile(const char *name, int *quit, int latency, int interval, void (*
 		abort();
 	}
 
-	/* latency of send buffer in samples */
-	latspl = samplerate * latency / 1000;
+	/* size of dsp buffer in samples */
+	buffer_size = dsp_samplerate * dsp_buffer / 1000;
 
 	/* check OSMO-CC support */
 	if (use_osmocc_cross && num_kanal == 1) {
@@ -457,15 +466,15 @@ void main_mobile(const char *name, int *quit, int latency, int interval, void (*
 		fprintf(stderr, "You selected OSMO-CC socket interface and built-in call forwarding, but only one can be selected.\n");
 		return;
 	}
-	if (echo_test && call_audiodev[0]) {
+	if (echo_test && call_device[0]) {
 		fprintf(stderr, "You selected call device (headset) and echo test, but only one can be selected.\n");
 		return;
 	}
-	if (use_osmocc_sock && call_audiodev[0]) {
+	if (use_osmocc_sock && call_device[0]) {
 		fprintf(stderr, "You selected OSMO-CC socket interface, but it cannot be used with call device (headset).\n");
 		return;
 	}
-	if (use_osmocc_cross && call_audiodev[0]) {
+	if (use_osmocc_cross && call_device[0]) {
 		fprintf(stderr, "You selected built-in call forwarding, but it cannot be used with call device (headset).\n");
 		return;
 	}
@@ -488,7 +497,7 @@ void main_mobile(const char *name, int *quit, int latency, int interval, void (*
 
 	/* init OSMO-CC */
 	if (!use_osmocc_sock)
-		console_init(station_id, call_audiodev, call_samplerate, latency, station_id_digits, loopback, echo_test, console_digits);
+		console_init(station_id, call_device, call_samplerate, call_buffer, station_id_digits, loopback, echo_test, console_digits);
 
 	/* init call control instance */
 	rc = call_init(name, (use_osmocc_sock) ? send_patterns : 0, release_on_disconnect, use_osmocc_sock, cc_argc, cc_argv);
@@ -498,15 +507,15 @@ void main_mobile(const char *name, int *quit, int latency, int interval, void (*
 	}
 
 #ifdef HAVE_SDR
-	rc = sdr_configure(samplerate);
+	rc = sdr_configure(dsp_samplerate);
 	if (rc < 0)
 		return;
 #endif
 
 	/* open audio */
-	if (sender_open_audio(latspl))
+	if (sender_open_audio(buffer_size, dsp_interval))
 		return;
-	if (console_open_audio(latspl))
+	if (console_open_audio(buffer_size, dsp_interval))
 		return;
 
 	if (!loopback)
@@ -552,7 +561,7 @@ void main_mobile(const char *name, int *quit, int latency, int interval, void (*
 			/* do not process audio for an audio slave, since it is done by audio master */
 			if (sender->master) /* if master is set, we are an audio slave */
 				continue;
-			process_sender_audio(sender, quit, latspl);
+			process_sender_audio(sender, quit, buffer_size);
 		}
 
 		/* process timers */
@@ -646,12 +655,12 @@ next_char:
 		if (myhandler)
 			myhandler();
 
-		display_measurements((double)interval / 1000.0);
+		display_measurements(dsp_interval / 1000.0);
 
 		now = get_time();
 
 		/* sleep interval */
-		sleep = ((double)interval / 1000.0) - (now - begin_time);
+		sleep = (dsp_interval / 1000.0) - (now - begin_time);
 		if (sleep > 0)
 			usleep(sleep * 1000000.0);
 
diff --git a/src/libmobile/main_mobile.h b/src/libmobile/main_mobile.h
index ccbfbae..f5df3a8 100644
--- a/src/libmobile/main_mobile.h
+++ b/src/libmobile/main_mobile.h
@@ -2,13 +2,13 @@
 extern int num_kanal;
 extern const char *kanal[];
 extern int swap_links;
-extern int num_audiodev;
-extern const char *audiodev[];
+extern int num_device;
 extern int allow_sdr;
 extern int use_sdr;
-extern int samplerate;
-extern int interval;
-extern int latency;
+extern const char *dsp_device[];
+extern int dsp_samplerate;
+extern double dsp_interval;
+extern int dsp_buffer;
 extern int uses_emphasis;
 extern int do_pre_emphasis;
 extern int do_de_emphasis;
@@ -42,7 +42,7 @@ int main_mobile_handle_options(int short_option, int argi, char **argv);
 extern int quit;
 void sighandler(int sigset);
 
-void main_mobile(const char *name, int *quit, int latency, int interval, void (*myhandler)(void), const char *station_id, int station_id_digits);
+void main_mobile(const char *name, int *quit, void (*myhandler)(void), const char *station_id, int station_id_digits);
 
 void dump_info(void);
 
diff --git a/src/libmobile/sender.c b/src/libmobile/sender.c
index cc85271..9ec8797 100644
--- a/src/libmobile/sender.c
+++ b/src/libmobile/sender.c
@@ -38,7 +38,7 @@ int cant_recover = 0;
 int check_channel = 1;
 
 /* Init transceiver instance and link to list of transceivers. */
-int sender_create(sender_t *sender, const char *kanal, double sendefrequenz, double empfangsfrequenz, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, enum paging_signal paging_signal)
+int sender_create(sender_t *sender, const char *kanal, double sendefrequenz, double empfangsfrequenz, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, enum paging_signal paging_signal)
 {
 	sender_t *master, *slave;
 	int rc = 0;
@@ -46,7 +46,7 @@ int sender_create(sender_t *sender, const char *kanal, double sendefrequenz, dou
 	sender->kanal = kanal;
 	sender->sendefrequenz = sendefrequenz;
 	sender->empfangsfrequenz = (loopback) ? sendefrequenz : empfangsfrequenz;
-	strncpy(sender->audiodev, audiodev, sizeof(sender->audiodev) - 1);
+	strncpy(sender->device, device, sizeof(sender->device) - 1);
 	sender->samplerate = samplerate;
 	sender->rx_gain = rx_gain;
 	sender->tx_gain = tx_gain;
@@ -90,7 +90,7 @@ int sender_create(sender_t *sender, const char *kanal, double sendefrequenz, dou
 			PDEBUG(DSENDER, DEBUG_NOTICE, "Please use at least one channel distance to avoid that.\n");
 			PDEBUG(DSENDER, DEBUG_NOTICE, "------------------------------------------------------------------------\n");
 		}
-		if (!strcmp(master->audiodev, audiodev))
+		if (!strcmp(master->device, device))
 			break;
 	}
 	if (master) {
@@ -169,7 +169,7 @@ error:
 	return rc;
 }
 
-int sender_open_audio(int latspl)
+int sender_open_audio(int buffer_size, double interval)
 {
 	sender_t *master, *inst;
 	int channels;
@@ -226,7 +226,7 @@ int sender_open_audio(int latspl)
 		}
 
 		/* open device */
-		master->audio = master->audio_open(master->audiodev, tx_f, rx_f, am, channels, paging_frequency, master->samplerate, latspl, (master->max_deviation) ?: 1.0, master->max_modulation, master->modulation_index);
+		master->audio = master->audio_open(master->device, tx_f, rx_f, am, channels, paging_frequency, master->samplerate, buffer_size, interval, (master->max_deviation) ?: 1.0, master->max_modulation, master->modulation_index);
 		if (!master->audio) {
 			PDEBUG(DSENDER, DEBUG_ERROR, "No device for transceiver!\n");
 			return -EIO;
@@ -321,7 +321,7 @@ static void gain_samples(sample_t *samples, int length, double gain)
 }
 
 /* Handle audio streaming of one transceiver. */
-void process_sender_audio(sender_t *sender, int *quit, int latspl)
+void process_sender_audio(sender_t *sender, int *quit, int buffer_size)
 {
 	sender_t *inst;
 	int rc, count;
@@ -332,8 +332,8 @@ void process_sender_audio(sender_t *sender, int *quit, int latspl)
 
 	/* count instances for audio channel */
 	for (num_chan = 0, inst = sender; inst; num_chan++, inst = inst->slave);
-	sample_t buff[num_chan][latspl], *samples[num_chan];
-	uint8_t pbuff[num_chan][latspl], *power[num_chan];
+	sample_t buff[num_chan][buffer_size], *samples[num_chan];
+	uint8_t pbuff[num_chan][buffer_size], *power[num_chan];
 	enum paging_signal paging_signal[num_chan];
 	int on[num_chan];
 	double rf_level_db[num_chan];
@@ -345,7 +345,7 @@ void process_sender_audio(sender_t *sender, int *quit, int latspl)
 #ifdef DEBUG_TIME_CONSUMPTION
 	t1 = get_time();
 #endif
-	count = sender->audio_get_tosend(sender->audio, latspl);
+	count = sender->audio_get_tosend(sender->audio, buffer_size);
 	if (count < 0) {
 		PDEBUG_CHAN(DSENDER, DEBUG_ERROR, "Failed to get number of samples in buffer (rc = %d)!\n", count);
 		if (count == -EPIPE) {
@@ -364,8 +364,8 @@ cant_recover:
 #endif
 	if (count > 0) {
 		/* limit to our buffer */
-		if (count > latspl)
-			count = latspl;
+		if (count > buffer_size)
+			count = buffer_size;
 		/* loop through all channels */
 		for (i = 0, inst = sender; inst; i++, inst = inst->slave) {
 			/* load TX data from audio loop or from sender instance */
@@ -414,7 +414,7 @@ cant_recover:
 	t3 = get_time();
 #endif
 
-	count = sender->audio_read(sender->audio, samples, latspl, num_chan, rf_level_db);
+	count = sender->audio_read(sender->audio, samples, buffer_size, num_chan, rf_level_db);
 	if (count < 0) {
 		/* special case when audio_read wants us to quit */
 		if (count == -EPERM) {
diff --git a/src/libmobile/sender.h b/src/libmobile/sender.h
index 25e68d1..3118516 100644
--- a/src/libmobile/sender.h
+++ b/src/libmobile/sender.h
@@ -43,8 +43,8 @@ typedef struct sender {
 
 	/* audio */
 	void			*audio;
-	char			audiodev[64];		/* audio device name (alsa or sdr) */
-	void			*(*audio_open)(const char *, double *, double *, int *, int, double, int, int, double, double, double);
+	char			device[64];		/* audio device name (alsa or sdr) */
+	void			*(*audio_open)(const char *, double *, double *, int *, int, double, int, int, double, double, double, double);
 	int 			(*audio_start)(void *);
 	void 			(*audio_close)(void *);
 	int			(*audio_write)(void *, sample_t **, uint8_t **, int, enum paging_signal *, int *, int);
@@ -93,13 +93,13 @@ extern sender_t *sender_head;
 extern int cant_recover;
 extern int check_channel;
 
-int sender_create(sender_t *sender, const char *kanal, double sendefrequenz, double empfangsfrequenz, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, enum paging_signal paging_signal);
+int sender_create(sender_t *sender, const char *kanal, double sendefrequenz, double empfangsfrequenz, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, enum paging_signal paging_signal);
 void sender_destroy(sender_t *sender);
 void sender_set_fm(sender_t *sender, double max_deviation, double max_modulation, double speech_deviation, double max_display);
 void sender_set_am(sender_t *sender, double max_modulation, double speech_deviation, double max_display, double modulation_index);
-int sender_open_audio(int latspl);
+int sender_open_audio(int buffer_size, double interval);
 int sender_start_audio(void);
-void process_sender_audio(sender_t *sender, int *quit, int latspl);
+void process_sender_audio(sender_t *sender, int *quit, int buffer_size);
 void sender_send(sender_t *sender, sample_t *samples, uint8_t *power, int count);
 void sender_receive(sender_t *sender, sample_t *samples, int count, double rf_level_db);
 void sender_paging(sender_t *sender, int on);
diff --git a/src/libsdr/sdr.c b/src/libsdr/sdr.c
index e2d3958..17ffa12 100644
--- a/src/libsdr/sdr.c
+++ b/src/libsdr/sdr.c
@@ -93,7 +93,8 @@ typedef struct sdr {
 	int		channels;	/* number of frequencies */
 	double		amplitude;	/* amplitude of each carrier */
 	int		samplerate;	/* sample rate of audio data */
-	int		latspl;		/* latency in audio samples */
+	int		buffer_size;	/* buffer in audio samples */
+	double		interval;	/* how often to process the loop */
 	wave_rec_t	wave_rx_rec;
 	wave_rec_t	wave_tx_rec;
 	wave_play_t	wave_rx_play;
@@ -136,7 +137,7 @@ static void show_spectrum(const char *direction, double halfbandwidth, double ce
 		PDEBUG(DSDR, DEBUG_INFO, "Frequency P = %.4f MHz (Paging Frequency)\n", paging_frequency / 1e6);
 }
 
-void *sdr_open(const char __attribute__((__unused__)) *audiodev, double *tx_frequency, double *rx_frequency, int *am, int channels, double paging_frequency, int samplerate, int latspl, double max_deviation, double max_modulation, double modulation_index)
+void *sdr_open(const char __attribute__((__unused__)) *device, double *tx_frequency, double *rx_frequency, int *am, int channels, double paging_frequency, int samplerate, int buffer_size, double interval, double max_deviation, double max_modulation, double modulation_index)
 {
 	sdr_t *sdr;
 	int threads = 1, oversample = 1; /* always use threads */
@@ -179,13 +180,14 @@ void *sdr_open(const char __attribute__((__unused__)) *audiodev, double *tx_freq
 	sdr->channels = channels;
 	sdr->amplitude = 1.0 / (double)channels;
 	sdr->samplerate = samplerate;
-	sdr->latspl = latspl;
+	sdr->buffer_size = buffer_size;
+	sdr->interval = interval;
 	sdr->threads = threads; /* always required, because write may block */
 	sdr->oversample = oversample;
 
 	if (threads) {
 		memset(&sdr->thread_read, 0, sizeof(sdr->thread_read));
-		sdr->thread_read.buffer_size = sdr->latspl * 2 * sdr->oversample + 2;
+		sdr->thread_read.buffer_size = sdr->buffer_size * 2 * sdr->oversample + 2;
 		sdr->thread_read.buffer = calloc(sdr->thread_read.buffer_size, sizeof(*sdr->thread_read.buffer));
 		if (!sdr->thread_read.buffer) {
 			PDEBUG(DSDR, DEBUG_ERROR, "No mem!\n");
@@ -202,7 +204,7 @@ void *sdr_open(const char __attribute__((__unused__)) *audiodev, double *tx_freq
 			iir_lowpass_init(&sdr->thread_read.lp[1], samplerate / 2.0, sdr_config->samplerate, 2);
 		}
 		memset(&sdr->thread_write, 0, sizeof(sdr->thread_write));
-		sdr->thread_write.buffer_size = sdr->latspl * 2 + 2;
+		sdr->thread_write.buffer_size = sdr->buffer_size * 2 + 2;
 		sdr->thread_write.buffer = calloc(sdr->thread_write.buffer_size, sizeof(*sdr->thread_write.buffer));
 		if (!sdr->thread_write.buffer) {
 			PDEBUG(DSDR, DEBUG_ERROR, "No mem!\n");
@@ -221,32 +223,32 @@ void *sdr_open(const char __attribute__((__unused__)) *audiodev, double *tx_freq
 	}
 
 	/* alloc fm modulation buffers */
-	sdr->modbuff = calloc(sdr->latspl * 2, sizeof(*sdr->modbuff));
+	sdr->modbuff = calloc(sdr->buffer_size * 2, sizeof(*sdr->modbuff));
 	if (!sdr->modbuff) {
 		PDEBUG(DSDR, DEBUG_ERROR, "NO MEM!\n");
 		goto error;
 	}
-	sdr->modbuff_I = calloc(sdr->latspl, sizeof(*sdr->modbuff_I));
+	sdr->modbuff_I = calloc(sdr->buffer_size, sizeof(*sdr->modbuff_I));
 	if (!sdr->modbuff_I) {
 		PDEBUG(DSDR, DEBUG_ERROR, "NO MEM!\n");
 		goto error;
 	}
-	sdr->modbuff_Q = calloc(sdr->latspl, sizeof(*sdr->modbuff_Q));
+	sdr->modbuff_Q = calloc(sdr->buffer_size, sizeof(*sdr->modbuff_Q));
 	if (!sdr->modbuff_Q) {
 		PDEBUG(DSDR, DEBUG_ERROR, "NO MEM!\n");
 		goto error;
 	}
-	sdr->modbuff_carrier = calloc(sdr->latspl, sizeof(*sdr->modbuff_carrier));
+	sdr->modbuff_carrier = calloc(sdr->buffer_size, sizeof(*sdr->modbuff_carrier));
 	if (!sdr->modbuff_carrier) {
 		PDEBUG(DSDR, DEBUG_ERROR, "NO MEM!\n");
 		goto error;
 	}
-	sdr->wavespl0 = calloc(sdr->latspl, sizeof(*sdr->wavespl0));
+	sdr->wavespl0 = calloc(sdr->buffer_size, sizeof(*sdr->wavespl0));
 	if (!sdr->wavespl0) {
 		PDEBUG(DSDR, DEBUG_ERROR, "NO MEM!\n");
 		goto error;
 	}
-	sdr->wavespl1 = calloc(sdr->latspl, sizeof(*sdr->wavespl1));
+	sdr->wavespl1 = calloc(sdr->buffer_size, sizeof(*sdr->wavespl1));
 	if (!sdr->wavespl1) {
 		PDEBUG(DSDR, DEBUG_ERROR, "NO MEM!\n");
 		goto error;
@@ -567,7 +569,7 @@ static void *sdr_write_child(void *arg)
 		}
 
 		/* delay some time */
-		usleep(1000);
+		usleep(sdr->interval * 1000.0);
 	}
 
 	PDEBUG(DSDR, DEBUG_DEBUG, "Thread received exit!\n");
@@ -619,7 +621,7 @@ static void *sdr_read_child(void *arg)
 		}
 
 		/* delay some time */
-		usleep(1000);
+		usleep(sdr->interval * 1000.0);
 	}
 
 	PDEBUG(DSDR, DEBUG_DEBUG, "Thread received exit!\n");
@@ -757,8 +759,8 @@ int sdr_write(void *inst, sample_t **samples, uint8_t **power, int num, enum pag
 	int c, s, ss;
 	int sent = 0;
 
-	if (num > sdr->latspl) {
-		fprintf(stderr, "exceeding maximum size given by sdr_latspl, please fix!\n");
+	if (num > sdr->buffer_size) {
+		fprintf(stderr, "exceeding maximum size given by sdr->buffer_size, please fix!\n");
 		abort();
 	}
 	if (channels != sdr->channels && channels != 0) {
@@ -858,8 +860,8 @@ int sdr_read(void *inst, sample_t **samples, int num, int channels, double *rf_l
 	int count = 0;
 	int c, s, ss;
 
-	if (num > sdr->latspl) {
-		fprintf(stderr, "exceeding maximum size given by sdr_latspl, please fix!\n");
+	if (num > sdr->buffer_size) {
+		fprintf(stderr, "exceeding maximum size given by sdr->buffer_size, please fix!\n");
 		abort();
 	}
 
@@ -981,19 +983,19 @@ int sdr_read(void *inst, sample_t **samples, int num, int channels, double *rf_l
 	return count;
 }
 
-/* how much do we need to send (in audio sample duration) to get the target delay (latspl) */
-int sdr_get_tosend(void *inst, int latspl)
+/* how much do we need to send (in audio sample duration) to get the target delay (buffer size) */
+int sdr_get_tosend(void *inst, int buffer_size)
 {
 	sdr_t *sdr = (sdr_t *)inst;
 	int count = 0;
 
 #ifdef HAVE_UHD
 	if (sdr_config->uhd)
-		count = uhd_get_tosend(latspl * sdr->oversample);
+		count = uhd_get_tosend(buffer_size * sdr->oversample);
 #endif
 #ifdef HAVE_SOAPY
 	if (sdr_config->soapy)
-		count = soapy_get_tosend(latspl * sdr->oversample);
+		count = soapy_get_tosend(buffer_size * sdr->oversample);
 #endif
 	if (count < 0)
 		return count;
diff --git a/src/libsdr/sdr.h b/src/libsdr/sdr.h
index daaed7c..0455200 100644
--- a/src/libsdr/sdr.h
+++ b/src/libsdr/sdr.h
@@ -2,10 +2,10 @@
 enum paging_signal;
 
 int sdr_start(void *inst);
-void *sdr_open(const char *audiodev, double *tx_frequency, double *rx_frequency, int *am, int channels, double paging_frequency, int samplerate, int latspl, double max_deviation, double max_modulation, double modulation_index);
+void *sdr_open(const char *audiodev, double *tx_frequency, double *rx_frequency, int *am, int channels, double paging_frequency, int samplerate, int buffer_size, double interval, double max_deviation, double max_modulation, double modulation_index);
 void sdr_close(void *inst);
 int sdr_write(void *inst, sample_t **samples, uint8_t **power, int num, enum paging_signal *paging_signal, int *on, int channels);
 int sdr_read(void *inst, sample_t **samples, int num, int channels, double *rf_level_db);
-int sdr_get_tosend(void *inst, int latspl);
+int sdr_get_tosend(void *inst, int buffer_size);
 void calibrate_bias(void);
 
diff --git a/src/libsdr/soapy.c b/src/libsdr/soapy.c
index 33dc436..6ae0504 100644
--- a/src/libsdr/soapy.c
+++ b/src/libsdr/soapy.c
@@ -27,9 +27,9 @@
  *
  * If a RX time stamp is valid and first chunk is to be transmitted (tosend()
  * is called), TX time stamp becomes valid and is set to RX time stamp, but
- * advanced by the duration of the latency (latspl). tosend() always returns
+ * advanced by the duration of the buffer size. tosend() always returns
  * the number of samples that are needed, to make TX time stamp advance RX time
- * stamp by given latency.
+ * stamp by given buffer size.
  *
  * If chunk is transmitted to SDR, the TX time stamp is advanced by the
  * duration of the transmitted chunk.
@@ -557,7 +557,7 @@ int soapy_receive(float *buff, int max)
 }
 
 /* estimate number of samples that can be sent */
-int soapy_get_tosend(int latspl)
+int soapy_get_tosend(int buffer_size)
 {
 	int tosend;
 
@@ -567,23 +567,23 @@ int soapy_get_tosend(int latspl)
 
 	/* RX time stamp is valid the first time, set the TX time stamp in advance */
 	if (!tx_valid) {
-		tx_timeNs = rx_timeNs + latspl * Ns_per_sample;
+		tx_timeNs = rx_timeNs + buffer_size * Ns_per_sample;
 		tx_valid = 1;
 		return 0;
 	}
 
 	/* we check how advance our transmitted time stamp is */
 	pthread_mutex_lock(×tamp_mutex);
-	tosend = latspl - (tx_timeNs - rx_timeNs) / Ns_per_sample;
+	tosend = buffer_size - (tx_timeNs - rx_timeNs) / Ns_per_sample;
 	pthread_mutex_unlock(×tamp_mutex);
 
 	/* in case of underrun */
-	if (tosend > latspl) {
+	if (tosend > buffer_size) {
 		PDEBUG(DSOAPY, DEBUG_ERROR, "SDR TX underrun, seems we are too slow. Use lower SDR sample rate.\n");
-		tosend = latspl;
+		tosend = buffer_size;
 	}
 
-	/* race condition and routing errors may cause TX time stamps to be in advance of slightly more than latspl */
+	/* race condition and routing errors may cause TX time stamps to be in advance of slightly more than buffer_size */
 	if (tosend < 0)
 		tosend = 0;
 
diff --git a/src/libsdr/soapy.h b/src/libsdr/soapy.h
index 875de3f..e1bf88b 100644
--- a/src/libsdr/soapy.h
+++ b/src/libsdr/soapy.h
@@ -4,5 +4,5 @@ int soapy_start(void);
 void soapy_close(void);
 int soapy_send(float *buff, int num);
 int soapy_receive(float *buff, int max);
-int soapy_get_tosend(int latspl);
+int soapy_get_tosend(int buffer_size);
 
diff --git a/src/libsdr/uhd.c b/src/libsdr/uhd.c
index e8c1d45..c601828 100644
--- a/src/libsdr/uhd.c
+++ b/src/libsdr/uhd.c
@@ -631,7 +631,7 @@ int uhd_receive(float *buff, int max)
 }
 
 /* estimate number of samples that can be sent */
-int uhd_get_tosend(int latspl)
+int uhd_get_tosend(int buffer_size)
 {
 	double advance;
 	int tosend;
@@ -645,7 +645,7 @@ int uhd_get_tosend(int latspl)
 		tx_time_secs = rx_time_secs;
 		tx_time_fract_sec = rx_time_fract_sec;
 		if (tx_timestamps) {
-			tx_time_fract_sec += (double)latspl / samplerate;
+			tx_time_fract_sec += (double)buffer_size / samplerate;
 			if (tx_time_fract_sec >= 1.0) {
 				tx_time_fract_sec -= 1.0;
 				tx_time_secs++;
@@ -660,7 +660,7 @@ int uhd_get_tosend(int latspl)
 		PDEBUG(DSOAPY, DEBUG_ERROR, "SDR TX underrun, seems we are too slow. Use lower SDR sample rate.\n");
 		advance = 0;
 	}
-	tosend = latspl - (int)(advance * samplerate);
+	tosend = buffer_size - (int)(advance * samplerate);
 	if (tosend < 0)
 		tosend = 0;
 
diff --git a/src/libsdr/uhd.h b/src/libsdr/uhd.h
index b2bd619..1273825 100644
--- a/src/libsdr/uhd.h
+++ b/src/libsdr/uhd.h
@@ -4,5 +4,5 @@ int uhd_start(void);
 void uhd_close(void);
 int uhd_send(float *buff, int num);
 int uhd_receive(float *buff, int max);
-int uhd_get_tosend(int latspl);
+int uhd_get_tosend(int buffer_size);
 
diff --git a/src/libsound/sound.h b/src/libsound/sound.h
index 6440a3c..173dfd3 100644
--- a/src/libsound/sound.h
+++ b/src/libsound/sound.h
@@ -1,10 +1,10 @@
 
 enum paging_signal;
 
-void *sound_open(const char *audiodev, double *tx_frequency, double *rx_frequency, int *am, int channels, double paging_frequency, int samplerate, int latspl, double max_deviation, double max_modulation, double modulation_index);
+void *sound_open(const char *audiodev, double *tx_frequency, double *rx_frequency, int *am, int channels, double paging_frequency, int samplerate, int buffer_size, double interval, double max_deviation, double max_modulation, double modulation_index);
 int sound_start(void *inst);
 void sound_close(void *inst);
 int sound_write(void *inst, sample_t **samples, uint8_t **power, int num, enum paging_signal *paging_signal, int *on, int channels);
 int sound_read(void *inst, sample_t **samples, int num, int channels, double *rf_level_db);
-int sound_get_tosend(void *inst, int latspl);
+int sound_get_tosend(void *inst, int buffer_size);
 
diff --git a/src/libsound/sound_alsa.c b/src/libsound/sound_alsa.c
index 6216b73..20a4a31 100644
--- a/src/libsound/sound_alsa.c
+++ b/src/libsound/sound_alsa.c
@@ -187,7 +187,7 @@ static void dev_close(sound_t *sound)
 		snd_pcm_close(sound->chandle);
 }
 
-void *sound_open(const char *audiodev, double __attribute__((unused)) *tx_frequency, double __attribute__((unused)) *rx_frequency, int __attribute__((unused)) *am, int channels, double __attribute__((unused)) paging_frequency, int samplerate, int __attribute((unused)) latspl, double max_deviation, double __attribute__((unused)) max_modulation, double __attribute__((unused)) modulation_index)
+void *sound_open(const char *audiodev, double __attribute__((unused)) *tx_frequency, double __attribute__((unused)) *rx_frequency, int __attribute__((unused)) *am, int channels, double __attribute__((unused)) paging_frequency, int samplerate, int __attribute((unused)) buffer_size, double __attribute__((unused)) interval, double max_deviation, double __attribute__((unused)) max_modulation, double __attribute__((unused)) modulation_index)
 {
 	sound_t *sound;
 	int rc;
@@ -487,7 +487,7 @@ int sound_read(void *inst, sample_t **samples, int num, int channels, double __a
  * get playback buffer space
  *
  * return number of samples to be sent */
-int sound_get_tosend(void *inst, int latspl)
+int sound_get_tosend(void *inst, int buffer_size)
 {
 	sound_t *sound = (sound_t *)inst;
 	int rc;
@@ -497,7 +497,7 @@ int sound_get_tosend(void *inst, int latspl)
 	rc = snd_pcm_delay(sound->phandle, &delay);
 	if (rc < 0) {
 		if (rc == -32)
-			PDEBUG(DSOUND, DEBUG_ERROR, "Buffer underrun: Please use higher latency and enable real time scheduling\n");
+			PDEBUG(DSOUND, DEBUG_ERROR, "Buffer underrun: Please use higher buffer and enable real time scheduling\n");
 		else
 			PDEBUG(DSOUND, DEBUG_ERROR, "failed to get delay from interface (%s)\n", snd_strerror(rc));
 		if (rc == -EPIPE) {
@@ -511,7 +511,7 @@ int sound_get_tosend(void *inst, int latspl)
 		return rc;
 	}
 
-	tosend = latspl - delay;
+	tosend = buffer_size - delay;
 	return tosend;
 }
 
diff --git a/src/mpt1327/main.c b/src/mpt1327/main.c
index bd90f4d..fd0d1ea 100644
--- a/src/mpt1327/main.c
+++ b/src/mpt1327/main.c
@@ -289,10 +289,10 @@ int main(int argc, char *argv[])
 		mandatory = 1;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 		/* set channel types for more than 1 channel */
 		if (num_kanal > 1 && num_chan_type == 0) {
 			chan_type[0] = CHAN_TYPE_CC;
@@ -302,9 +302,9 @@ int main(int argc, char *argv[])
 		}
 
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
@@ -370,7 +370,7 @@ int main(int argc, char *argv[])
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = mpt1327_create(band, kanal[i], chan_type[i], audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db);
+		rc = mpt1327_create(band, kanal[i], chan_type[i], dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, squelch_db);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create transceiver instance. Quitting!\n");
 			goto fail;
@@ -380,7 +380,7 @@ int main(int argc, char *argv[])
 
 	mpt1327_check_channels();
 
-	main_mobile("mpt1327", &quit, latency, interval, NULL, station_id, 7);
+	main_mobile("mpt1327", &quit, NULL, station_id, 7);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/mpt1327/mpt1327.c b/src/mpt1327/mpt1327.c
index cb11139..24c9103 100755
--- a/src/mpt1327/mpt1327.c
+++ b/src/mpt1327/mpt1327.c
@@ -580,7 +580,7 @@ static void mpt1327_new_state(mpt1327_t *mpt1327, enum mpt1327_state new_state,
 static void mpt1327_timeout(struct timer *timer);
 
 /* Create transceiver instance and link to a list. */
-int mpt1327_create(enum mpt1327_band band, const char *kanal, enum mpt1327_chan_type chan_type, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db)
+int mpt1327_create(enum mpt1327_band band, const char *kanal, enum mpt1327_chan_type chan_type, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db)
 {
 	sender_t *sender;
 	mpt1327_t *mpt1327;
@@ -607,7 +607,7 @@ int mpt1327_create(enum mpt1327_band band, const char *kanal, enum mpt1327_chan_
 	PDEBUG(DMPT1327, DEBUG_DEBUG, "Creating 'MPT1327' instance for Channel %s on Band %s (sample rate %d).\n", kanal, mpt1327_band_def[band].name, samplerate);
 
 	/* init general part of transceiver */
-	rc = sender_create(&mpt1327->sender, kanal, mpt1327_channel2freq(band, atoi(kanal), 0), mpt1327_channel2freq(band, atoi(kanal), 1), audiodev, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&mpt1327->sender, kanal, mpt1327_channel2freq(band, atoi(kanal), 0), mpt1327_channel2freq(band, atoi(kanal), 1), device, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DMPT1327, DEBUG_ERROR, "Failed to init 'Sender' processing!\n");
 		goto error;
diff --git a/src/mpt1327/mpt1327.h b/src/mpt1327/mpt1327.h
index 7878727..ab71970 100755
--- a/src/mpt1327/mpt1327.h
+++ b/src/mpt1327/mpt1327.h
@@ -146,7 +146,7 @@ void mpt1327_channel_list(void);
 int mpt1327_channel_by_short_name(const char *short_name);
 const char *chan_type_short_name(enum mpt1327_chan_type chan_type);
 const char *chan_type_long_name(enum mpt1327_chan_type chan_type);
-int mpt1327_create(enum mpt1327_band band, const char *kanal, enum mpt1327_chan_type chan_type, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db);
+int mpt1327_create(enum mpt1327_band band, const char *kanal, enum mpt1327_chan_type chan_type, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, int loopback, double squelch_db);
 void mpt1327_check_channels(void);
 void mpt1327_destroy(sender_t *sender);
 void mpt1327_receive_codeword(mpt1327_t *mpt1327, uint64_t bits, double quality, double level);
diff --git a/src/nmt/main.c b/src/nmt/main.c
index 7d4c91e..8f4a04a 100644
--- a/src/nmt/main.c
+++ b/src/nmt/main.c
@@ -293,10 +293,10 @@ int main(int argc, char *argv[])
 		mandatory = 1;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 		/* set channel types for more than 1 channel */
 		if (num_kanal > 1 && num_chan_type == 0) {
 			if (loopback)
@@ -318,9 +318,9 @@ int main(int argc, char *argv[])
 			num_supervisory = num_kanal;
 		}
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		return -EINVAL;
 	}
@@ -397,7 +397,7 @@ int main(int argc, char *argv[])
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = nmt_create(nmt_system, country, kanal[i], chan_type[i], audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, ms_power, traffic_area, area_no, compandor, supervisory[i], smsc_number, send_callerid, loopback);
+		rc = nmt_create(nmt_system, country, kanal[i], chan_type[i], dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, ms_power, traffic_area, area_no, compandor, supervisory[i], smsc_number, send_callerid, loopback);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create transceiver instance. Quitting!\n");
 			goto fail;
@@ -407,7 +407,7 @@ int main(int argc, char *argv[])
 
 	nmt_check_channels(nmt_system);
 
-	main_mobile("nmt", &quit, latency, interval, myhandler, station_id, 7);
+	main_mobile("nmt", &quit, myhandler, station_id, 7);
 
 fail:
 	/* fifo */
diff --git a/src/nmt/nmt.c b/src/nmt/nmt.c
index ad22f00..6b89590 100644
--- a/src/nmt/nmt.c
+++ b/src/nmt/nmt.c
@@ -261,7 +261,7 @@ static inline int is_chan_class_tc(enum nmt_chan_type chan_type)
 static void nmt_timeout(struct timer *timer);
 
 /* Create transceiver instance and link to a list. */
-int nmt_create(int nmt_system, const char *country, const char *kanal, enum nmt_chan_type chan_type, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, uint8_t ms_power, uint8_t traffic_area, uint8_t area_no, int compandor, int supervisory, const char *smsc_number, int send_callerid, int loopback)
+int nmt_create(int nmt_system, const char *country, const char *kanal, enum nmt_chan_type chan_type, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, uint8_t ms_power, uint8_t traffic_area, uint8_t area_no, int compandor, int supervisory, const char *smsc_number, int send_callerid, int loopback)
 {
 	nmt_t *nmt;
 	int rc;
@@ -300,7 +300,7 @@ int nmt_create(int nmt_system, const char *country, const char *kanal, enum nmt_
 	PDEBUG(DNMT, DEBUG_DEBUG, "Creating 'NMT' instance for channel = %s (sample rate %d).\n", kanal, samplerate);
 
 	/* init general part of transceiver */
-	rc = sender_create(&nmt->sender, kanal, nmt_channel2freq(nmt_system, country, atoi(kanal), 0, NULL, NULL, NULL), nmt_channel2freq(nmt_system, country, atoi(kanal), 1, NULL, NULL, NULL), audiodev, use_sdr, samplerate, rx_gain, tx_gain, pre_emphasis, de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&nmt->sender, kanal, nmt_channel2freq(nmt_system, country, atoi(kanal), 0, NULL, NULL, NULL), nmt_channel2freq(nmt_system, country, atoi(kanal), 1, NULL, NULL, NULL), device, use_sdr, samplerate, rx_gain, tx_gain, pre_emphasis, de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DNMT, DEBUG_ERROR, "Failed to init transceiver process!\n");
 		goto error;
diff --git a/src/nmt/nmt.h b/src/nmt/nmt.h
index 8c51c4a..06d0629 100644
--- a/src/nmt/nmt.h
+++ b/src/nmt/nmt.h
@@ -143,7 +143,7 @@ void nmt_channel_list(int nmt_system);
 int nmt_channel_by_short_name(int nmt_system, const char *short_name);
 const char *chan_type_short_name(int nmt_system, enum nmt_chan_type chan_type);
 const char *chan_type_long_name(int nmt_system, enum nmt_chan_type chan_type);
-int nmt_create(int nmt_system, const char *country, const char *kanal, enum nmt_chan_type chan_type, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, uint8_t ms_power, uint8_t traffic_area, uint8_t area_no, int compandor, int supervisory, const char *smsc_number, int send_callerid, int loopback);
+int nmt_create(int nmt_system, const char *country, const char *kanal, enum nmt_chan_type chan_type, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, uint8_t ms_power, uint8_t traffic_area, uint8_t area_no, int compandor, int supervisory, const char *smsc_number, int send_callerid, int loopback);
 void nmt_check_channels(int nmt_system);
 void nmt_destroy(sender_t *sender);
 void nmt_go_idle(nmt_t *nmt);
diff --git a/src/r2000/main.c b/src/r2000/main.c
index 01361c4..c895217 100644
--- a/src/r2000/main.c
+++ b/src/r2000/main.c
@@ -281,10 +281,10 @@ int main(int argc, char *argv[])
 		mandatory = 1;
 	}
 	if (use_sdr) {
-		/* set audiodev */
+		/* set device */
 		for (i = 0; i < num_kanal; i++)
-			audiodev[i] = "sdr";
-		num_audiodev = num_kanal;
+			dsp_device[i] = "sdr";
+		num_device = num_kanal;
 		/* set channel types for more than 1 channel */
 		if (num_kanal > 1 && num_chan_type == 0) {
 			chan_type[0] = CHAN_TYPE_CC;
@@ -294,9 +294,9 @@ int main(int argc, char *argv[])
 		}
 
 	}
-	if (num_kanal == 1 && num_audiodev == 0)
-		num_audiodev = 1; /* use default */
-	if (num_kanal != num_audiodev) {
+	if (num_kanal == 1 && num_device == 0)
+		num_device = 1; /* use default */
+	if (num_kanal != num_device) {
 		fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
 		exit(0);
 	}
@@ -352,7 +352,7 @@ int main(int argc, char *argv[])
 
 	/* create transceiver instance */
 	for (i = 0; i < num_kanal; i++) {
-		rc = r2000_create(band, kanal[i], chan_type[i], audiodev[i], use_sdr, samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, relais, deport, agi, sm_power, taxe, crins, destruction, nconv, recall, loopback);
+		rc = r2000_create(band, kanal[i], chan_type[i], dsp_device[i], use_sdr, dsp_samplerate, rx_gain, tx_gain, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, relais, deport, agi, sm_power, taxe, crins, destruction, nconv, recall, loopback);
 		if (rc < 0) {
 			fprintf(stderr, "Failed to create transceiver instance. Quitting!\n");
 			goto fail;
@@ -363,7 +363,7 @@ int main(int argc, char *argv[])
 
 	r2000_check_channels();
 
-	main_mobile("radiocom2000", &quit, latency, interval, NULL, station_id, 9);
+	main_mobile("radiocom2000", &quit, NULL, station_id, 9);
 
 fail:
 	/* destroy transceiver instance */
diff --git a/src/r2000/r2000.c b/src/r2000/r2000.c
index 94c082d..26df685 100644
--- a/src/r2000/r2000.c
+++ b/src/r2000/r2000.c
@@ -409,7 +409,7 @@ uint8_t r2000_encode_super(r2000_t *r2000)
 static void r2000_timeout(struct timer *timer);
 
 /* Create transceiver instance and link to a list. */
-int r2000_create(int band, const char *kanal, enum r2000_chan_type chan_type, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, uint16_t relais, uint8_t deport, uint8_t agi, uint8_t sm_power, uint8_t taxe, uint8_t crins, int destruction, uint8_t nconv, int recall, int loopback)
+int r2000_create(int band, const char *kanal, enum r2000_chan_type chan_type, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, uint16_t relais, uint8_t deport, uint8_t agi, uint8_t sm_power, uint8_t taxe, uint8_t crins, int destruction, uint8_t nconv, int recall, int loopback)
 {
 	sender_t *sender;
 	r2000_t *r2000 = NULL;
@@ -437,7 +437,7 @@ int r2000_create(int band, const char *kanal, enum r2000_chan_type chan_type, co
 	PDEBUG(DR2000, DEBUG_DEBUG, "Creating 'Radiocom 2000' instance for channel = %s (sample rate %d).\n", kanal, samplerate);
 
 	/* init general part of transceiver */
-	rc = sender_create(&r2000->sender, kanal, r2000_channel2freq(band, atoi(kanal), 0), r2000_channel2freq(band, atoi(kanal), 1), audiodev, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
+	rc = sender_create(&r2000->sender, kanal, r2000_channel2freq(band, atoi(kanal), 0), r2000_channel2freq(band, atoi(kanal), 1), device, use_sdr, samplerate, rx_gain, tx_gain, 0, 0, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback, PAGING_SIGNAL_NONE);
 	if (rc < 0) {
 		PDEBUG(DR2000, DEBUG_ERROR, "Failed to init transceiver process!\n");
 		goto error;
diff --git a/src/r2000/r2000.h b/src/r2000/r2000.h
index 5315d57..15f1fe9 100644
--- a/src/r2000/r2000.h
+++ b/src/r2000/r2000.h
@@ -123,7 +123,7 @@ void r2000_channel_list(void);
 int r2000_channel_by_short_name(const char *short_name);
 const char *chan_type_short_name(enum r2000_chan_type chan_type);
 const char *chan_type_long_name(enum r2000_chan_type chan_type);
-int r2000_create(int band, const char *kanal, enum r2000_chan_type chan_type, const char *audiodev, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, uint16_t relais, uint8_t deport, uint8_t agi, uint8_t sm_power, uint8_t taxe, uint8_t crins, int destruction, uint8_t nconv, int recall, int loopback);
+int r2000_create(int band, const char *kanal, enum r2000_chan_type chan_type, const char *device, int use_sdr, int samplerate, double rx_gain, double tx_gain, int pre_emphasis, int de_emphasis, const char *write_rx_wave, const char *write_tx_wave, const char *read_rx_wave, const char *read_tx_wave, uint16_t relais, uint8_t deport, uint8_t agi, uint8_t sm_power, uint8_t taxe, uint8_t crins, int destruction, uint8_t nconv, int recall, int loopback);
 void r2000_check_channels(void);
 void r2000_destroy(sender_t *sender);
 void r2000_go_idle(r2000_t *r2000);
diff --git a/src/radio/main.c b/src/radio/main.c
index 665848b..b45d106 100644
--- a/src/radio/main.c
+++ b/src/radio/main.c
@@ -48,8 +48,8 @@ int fast_math = 0;
 void *get_sender_by_empfangsfrequenz() { return NULL; }
 
 static double frequency = 0.0;
-static int samplerate = 100000;
-static int latency = 30;
+static int dsp_samplerate = 100000;
+static int dsp_buffer = 30;
 static const char *tx_wave_file = NULL;
 static const char *rx_wave_file = NULL;
 static const char *tx_audiodev = NULL;
@@ -114,7 +114,7 @@ void print_help(const char *arg0)
 	printf(" -f --frequency \n");
 	printf("        Give frequency in Hertz.\n");
 	printf(" -s --samplerate \n");
-	printf("        Give signal processing sample rate in Hz. (default = %d)\n", samplerate);
+	printf("        Give signal processing sample rate in Hz. (default = %d)\n", dsp_samplerate);
 	printf("        This sample rate must be high enough for the signal's spectrum to fit.\n");
 	printf("        I will inform you, if this bandwidth is too low.\n");
 	printf(" -r --tx-wave-file \n");
@@ -194,7 +194,7 @@ static int handle_options(int short_option, int argi, char **argv)
 		frequency = atof(argv[argi]);
 		break;
 	case 's':
-		samplerate = atof(argv[argi]);
+		dsp_samplerate = atof(argv[argi]);
 		break;
 	case 'r':
 		tx_wave_file = options_strdup(argv[argi]);
@@ -297,7 +297,7 @@ int main(int argc, char *argv[])
 	radio_t radio;
 	struct termios term, term_orig;
 	int c;
-	int latspl;
+	int buffer_size;
 
 	debuglevel = 0;
 
@@ -322,7 +322,7 @@ int main(int argc, char *argv[])
 	fm_init(fast_math);
 	am_init(fast_math);
 
-	rc = sdr_configure(samplerate);
+	rc = sdr_configure(dsp_samplerate);
 	if (rc < 0)
 		return rc;
 	if (rc == 0) {
@@ -358,10 +358,10 @@ int main(int argc, char *argv[])
 		exit(0);
 	}
 
-	/* now we have latency and sample rate */
-	latspl = samplerate * latency / 1000;
+	/* now we have buffer size and sample rate */
+	buffer_size = dsp_samplerate * dsp_buffer / 1000;
 
-	rc = radio_init(&radio, latspl, samplerate, frequency, tx_wave_file, rx_wave_file, (tx) ? tx_audiodev : NULL, (rx) ? rx_audiodev : NULL, modulation, bandwidth, deviation, modulation_index, time_constant_us, volume, stereo, rds, rds2);
+	rc = radio_init(&radio, buffer_size, dsp_samplerate, frequency, tx_wave_file, rx_wave_file, (tx) ? tx_audiodev : NULL, (rx) ? rx_audiodev : NULL, modulation, bandwidth, deviation, modulation_index, time_constant_us, volume, stereo, rds, rds2);
 	if (rc < 0) {
 		fprintf(stderr, "Failed to initialize radio with given options, exitting!\n");
 		exit(0);
@@ -370,7 +370,7 @@ int main(int argc, char *argv[])
 	void *sdr = NULL;
 	float *sendbuff = NULL;
 
-	sendbuff = calloc(latspl * 2, sizeof(*sendbuff));
+	sendbuff = calloc(buffer_size * 2, sizeof(*sendbuff));
 	if (!sendbuff) {
 		fprintf(stderr, "No mem!\n");
 		goto error;
@@ -393,7 +393,7 @@ int main(int argc, char *argv[])
 	tx_frequencies[0] = frequency;
 	rx_frequencies[0] = frequency;
 	am[0] = 0;
-	sdr = sdr_open(NULL, tx_frequencies, rx_frequencies, am, 1, 0.0, samplerate, latspl, 0.0, 0.0, 0.0);
+	sdr = sdr_open(NULL, tx_frequencies, rx_frequencies, am, 1, 0.0, dsp_samplerate, buffer_size, 1.0, 0.0, 0.0, 0.0);
 	if (!sdr)
 		goto error;
 	sdr_start(sdr);
@@ -422,15 +422,15 @@ int main(int argc, char *argv[])
 	int tosend, got;
 	while (!quit) {
 		usleep(1000);
-		got = sdr_read(sdr, (void *)sendbuff, latspl, 0, NULL);
+		got = sdr_read(sdr, (void *)sendbuff, buffer_size, 0, NULL);
 		if (rx) {
 			got = radio_rx(&radio, sendbuff, got);
 			if (got < 0)
 				break;
 		}
-		tosend = sdr_get_tosend(sdr, latspl);
-		if (tosend > latspl / 10)
-			tosend = latspl / 10;
+		tosend = sdr_get_tosend(sdr, buffer_size);
+		if (tosend > buffer_size / 10)
+			tosend = buffer_size / 10;
 		if (tosend == 0) {
 			continue;
 		}
diff --git a/src/radio/radio.c b/src/radio/radio.c
index e56ea8e..d48e444 100644
--- a/src/radio/radio.c
+++ b/src/radio/radio.c
@@ -38,14 +38,14 @@
 
 static char freq_name[2][64];
 
-int radio_init(radio_t *radio, int latspl, int samplerate, double frequency, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant_us, double volume, int stereo, int rds, int rds2)
+int radio_init(radio_t *radio, int buffer_size, int samplerate, double frequency, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant_us, double volume, int stereo, int rds, int rds2)
 {
 	int rc = -EINVAL;
 
 	clipper_init(CLIP_POINT);
 
 	memset(radio, 0, sizeof(*radio));
-	radio->latspl = latspl;
+	radio->buffer_size = buffer_size;
 	radio->volume = volume;
 	radio->stereo = stereo;
 	radio->rds = rds;
@@ -100,7 +100,7 @@ int radio_init(radio_t *radio, int latspl, int samplerate, double frequency, con
 		/* open audio device */
 		radio->tx_audio_samplerate = 48000;
 		radio->tx_audio_channels = (stereo) ? 2 : 1;
-		radio->tx_sound = sound_open(tx_audiodev, NULL, NULL, NULL, radio->tx_audio_channels, 0.0, radio->tx_audio_samplerate, radio->latspl, 1.0, 0.0, 2.0);
+		radio->tx_sound = sound_open(tx_audiodev, NULL, NULL, NULL, radio->tx_audio_channels, 0.0, radio->tx_audio_samplerate, radio->buffer_size, 1.0, 1.0, 0.0, 2.0);
 		if (!radio->tx_sound) {
 			rc = -EIO;
 			PDEBUG(DRADIO, DEBUG_ERROR, "Failed to open sound device!\n");
@@ -167,7 +167,7 @@ int radio_init(radio_t *radio, int latspl, int samplerate, double frequency, con
 		if (radio->tx_sound && !strcmp(tx_audiodev, rx_audiodev))
 			radio->rx_sound = radio->tx_sound;
 		else
-			radio->rx_sound = sound_open(rx_audiodev, NULL, NULL, NULL, radio->rx_audio_channels, 0.0, radio->rx_audio_samplerate, radio->latspl, 1.0, 0.0, 2.0);
+			radio->rx_sound = sound_open(rx_audiodev, NULL, NULL, NULL, radio->rx_audio_channels, 0.0, radio->rx_audio_samplerate, radio->buffer_size, 1.0, 1.0, 0.0, 2.0);
 		if (!radio->rx_sound) {
 			rc = -EIO;
 			PDEBUG(DRADIO, DEBUG_ERROR, "Failed to open sound device!\n");
@@ -310,8 +310,8 @@ int radio_init(radio_t *radio, int latspl, int samplerate, double frequency, con
 	}
 
 	/* audio buffers: how many sample for audio (rounded down) */
-	int tx_size = (int)((double)latspl / radio->tx_resampler[0].factor);
-	int rx_size = (int)((double)latspl / radio->rx_resampler[0].factor);
+	int tx_size = (int)((double)buffer_size / radio->tx_resampler[0].factor);
+	int rx_size = (int)((double)buffer_size / radio->rx_resampler[0].factor);
 	if (tx_size > rx_size)
 		radio->audio_buffer_size = tx_size;
 	else
@@ -324,7 +324,7 @@ int radio_init(radio_t *radio, int latspl, int samplerate, double frequency, con
 	}
 
 	/* signal buffers */
-	radio->signal_buffer_size = latspl;
+	radio->signal_buffer_size = buffer_size;
 	radio->signal_buffer = calloc(radio->signal_buffer_size * 3, sizeof(*radio->signal_buffer));
 	radio->signal_power_buffer = calloc(radio->signal_buffer_size, sizeof(*radio->signal_power_buffer));
 	if (!radio->signal_buffer || !radio->signal_power_buffer) {
@@ -334,9 +334,9 @@ int radio_init(radio_t *radio, int latspl, int samplerate, double frequency, con
 	}
 
 	/* temporary I/Q/carrier buffers, used while demodulating */
-	radio->I_buffer = calloc(latspl, sizeof(*radio->I_buffer));
-	radio->Q_buffer = calloc(latspl, sizeof(*radio->Q_buffer));
-	radio->carrier_buffer = calloc(latspl, sizeof(*radio->carrier_buffer));
+	radio->I_buffer = calloc(buffer_size, sizeof(*radio->I_buffer));
+	radio->Q_buffer = calloc(buffer_size, sizeof(*radio->Q_buffer));
+	radio->carrier_buffer = calloc(buffer_size, sizeof(*radio->carrier_buffer));
 	if (!radio->I_buffer || !radio->Q_buffer || !radio->carrier_buffer) {
 		PDEBUG(DRADIO, DEBUG_ERROR, "No memory!!\n");
 		rc = -ENOMEM;
@@ -438,8 +438,8 @@ int radio_tx(radio_t *radio, float *baseband, int signal_num)
 	sample_t *signal_samples[3];
 	uint8_t *signal_power;
 
-	if (signal_num > radio->latspl) {
-		PDEBUG(DRADIO, DEBUG_ERROR, "signal_num > latspl, please fix!.\n");
+	if (signal_num > radio->buffer_size) {
+		PDEBUG(DRADIO, DEBUG_ERROR, "signal_num > buffer_size, please fix!.\n");
 		abort();
 	}
 
@@ -611,8 +611,8 @@ int radio_rx(radio_t *radio, float *baseband, int signal_num)
 	sample_t *samples[3];
 	double p;
 
-	if (signal_num > radio->latspl) {
-		PDEBUG(DRADIO, DEBUG_ERROR, "signal_num > latspl, please fix!.\n");
+	if (signal_num > radio->buffer_size) {
+		PDEBUG(DRADIO, DEBUG_ERROR, "signal_num > buffer_size, please fix!.\n");
 		abort();
 	}
 
diff --git a/src/radio/radio.h b/src/radio/radio.h
index f0aeaf2..35c36ee 100644
--- a/src/radio/radio.h
+++ b/src/radio/radio.h
@@ -24,7 +24,7 @@ enum audio_mode {
 
 typedef struct radio {
 	/* modes */
-	int		latspl;			/* maximum number of samples */
+	int		buffer_size;		/* maximum number of samples */
 	enum modulation	modulation;		/* modulation type */
 	enum audio_mode	tx_audio_mode;		/* mode for audio source */
 	enum audio_mode	rx_audio_mode;		/* mode for audio sink */
@@ -81,7 +81,7 @@ typedef struct radio {
 	sample_t	*carrier_buffer;
 } radio_t;
 
-int radio_init(radio_t *radio, int latspl, int samplerate, double frequency, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant, double volume, int stereo, int rds, int rds2);
+int radio_init(radio_t *radio, int buffer_size, int samplerate, double frequency, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant, double volume, int stereo, int rds, int rds2);
 void radio_exit(radio_t *radio);
 int radio_start(radio_t *radio);
 int radio_tx(radio_t *radio, float *baseband, int num);
diff --git a/src/tv/main.c b/src/tv/main.c
index bb3e57e..e8ded74 100644
--- a/src/tv/main.c
+++ b/src/tv/main.c
@@ -61,8 +61,8 @@ static int color_bar = 0;
 static int grid_only = 0;
 static const char *station_id = "Jolly  Roger";
 static int grid_width = 0;
-static int __attribute__((__unused__)) latency = 200;
-static double samplerate = 10e6;
+static int __attribute__((__unused__)) dsp_buffer = 200;
+static double dsp_samplerate = 10e6;
 static const char *wave_file = NULL;
 
 /* global variable to quit main loop */
@@ -186,7 +186,7 @@ static int handle_options(int short_option, int argi, char **argv)
 		printf("Given channel is '%s' (video = %.2f MHz, audio = %.2f MHz)\n", argv[argi], frequency / 1e6, (frequency + audio_offset) / 1e6);
 		break;
 	case 's':
-		samplerate = atof(argv[argi]);
+		dsp_samplerate = atof(argv[argi]);
 		break;
 	case 'w':
 		wave_file = options_strdup(argv[argi]);
@@ -272,7 +272,7 @@ static void tx_bas(sample_t *sample_bas, __attribute__((__unused__)) sample_t *s
 		int rc;
 		sample_t *buffers[1];
 
-		rc = wave_create_record(&rec, wave_file, samplerate, 1, 1.0);
+		rc = wave_create_record(&rec, wave_file, dsp_samplerate, 1, 1.0);
 		if (rc < 0) {
 			// FIXME cleanup
 			exit(0);
@@ -286,7 +286,7 @@ static void tx_bas(sample_t *sample_bas, __attribute__((__unused__)) sample_t *s
 #ifdef HAVE_SDR
 		float *buff = NULL;
 		void *sdr = NULL;
-		int latspl = samplerate * latency / 1000;
+		int buffer_size = dsp_samplerate * dsp_buffer / 1000;
 		float *sendbuff = NULL;
 
 		if ((sdr_config->uhd == 0 && sdr_config->soapy == 0)) {
@@ -294,7 +294,7 @@ static void tx_bas(sample_t *sample_bas, __attribute__((__unused__)) sample_t *s
 			goto error;
 		}
 
-		sendbuff = calloc(latspl * 2, sizeof(*sendbuff));
+		sendbuff = calloc(buffer_size * 2, sizeof(*sendbuff));
 		if (!sendbuff) {
 			fprintf(stderr, "No mem!\n");
 			goto error;
@@ -311,7 +311,7 @@ static void tx_bas(sample_t *sample_bas, __attribute__((__unused__)) sample_t *s
 		if (sample_tone) {
 			/* bandwidth is 2*(deviation + 2*f(sig)) = 2 * (50 + 2*15) = 160khz */
 			fm_mod_t mod;
-			fm_mod_init(&mod, samplerate, audio_offset, modulation * 0.1);
+			fm_mod_init(&mod, dsp_samplerate, audio_offset, modulation * 0.1);
 			mod.state = MOD_STATE_ON; /* do not ramp up */
 			fm_modulate_complex(&mod, sample_tone, power_tone, samples, buff);
 		}
@@ -333,7 +333,7 @@ static void tx_bas(sample_t *sample_bas, __attribute__((__unused__)) sample_t *s
 		tx_frequencies[0] = frequency;
 		rx_frequencies[0] = frequency;
 		am[0] = 0;
-		sdr = sdr_open(NULL, tx_frequencies, rx_frequencies, am, 1, 0.0, samplerate, latspl, 0.0, 0.0, 0.0);
+		sdr = sdr_open(NULL, tx_frequencies, rx_frequencies, am, 1, 0.0, dsp_samplerate, buffer_size, 1.0, 0.0, 0.0, 0.0);
 		if (!sdr)
 			goto error;
 		sdr_start(sdr);
@@ -342,10 +342,10 @@ static void tx_bas(sample_t *sample_bas, __attribute__((__unused__)) sample_t *s
 		int s, ss, tosend;
 		while (!quit) {
 			usleep(1000);
-			sdr_read(sdr, (void *)sendbuff, latspl, 0, NULL);
-			tosend = sdr_get_tosend(sdr, latspl);
-			if (tosend > latspl / 10)
-				tosend = latspl / 10;
+			sdr_read(sdr, (void *)sendbuff, buffer_size, 0, NULL);
+			tosend = sdr_get_tosend(sdr, buffer_size);
+			if (tosend > buffer_size / 10)
+				tosend = buffer_size / 10;
 			if (tosend == 0) {
 				continue;
 			}
@@ -395,12 +395,12 @@ static int tx_test_picture(enum bas_type type)
 	int count;
 
 	/* test image, add some samples in case of overflow due to rounding errors */
-	test_bas = calloc(samplerate / 25.0 * 4.0 + 10.0, sizeof(sample_t));
+	test_bas = calloc(dsp_samplerate / 25.0 * 4.0 + 10.0, sizeof(sample_t));
 	if (!test_bas) {
 		fprintf(stderr, "No mem!\n");
 		goto error;
 	}
-	bas_init(&bas, samplerate, type, fbas, circle_radius, color_bar, grid_only, station_id, grid_width, NULL, 0, 0);
+	bas_init(&bas, dsp_samplerate, type, fbas, circle_radius, color_bar, grid_only, station_id, grid_width, NULL, 0, 0);
 	count = bas_generate(&bas, test_bas);
 	count += bas_generate(&bas, test_bas + count);
 	count += bas_generate(&bas, test_bas + count);
@@ -420,7 +420,7 @@ static int tx_test_picture(enum bas_type type)
 		}
 		/* emphasis 50us, but 1000Hz does not change level */
 		for (i = 0; i < count; i++)
-			test_tone[i] = sin((double)i * 2.0 * M_PI * 1000.0 / samplerate) * 50000;
+			test_tone[i] = sin((double)i * 2.0 * M_PI * 1000.0 / dsp_samplerate) * 50000;
 		memset(test_power, 1, count);
 	}
 
@@ -463,12 +463,12 @@ static int tx_img(const char *filename)
 	}
 
 	/* test image, add some samples in case of overflow due to rounding errors */
-	img_bas = calloc(samplerate / 25.0 * 4.0 + 10.0, sizeof(sample_t));
+	img_bas = calloc(dsp_samplerate / 25.0 * 4.0 + 10.0, sizeof(sample_t));
 	if (!img_bas) {
 		fprintf(stderr, "No mem!\n");
 		goto error;
 	}
-	bas_init(&bas, samplerate, BAS_IMAGE, fbas, circle_radius, color_bar, grid_only, NULL, grid_width, img, width, height);
+	bas_init(&bas, dsp_samplerate, BAS_IMAGE, fbas, circle_radius, color_bar, grid_only, NULL, grid_width, img, width, height);
 	count = bas_generate(&bas, img_bas);
 	count += bas_generate(&bas, img_bas + count);
 	count += bas_generate(&bas, img_bas + count);
@@ -513,7 +513,7 @@ int main(int argc, char *argv[])
 
 	if (!wave_file) {
 #ifdef HAVE_SDR
-		rc = sdr_configure(samplerate);
+		rc = sdr_configure(dsp_samplerate);
 		if (rc < 0)
 			return rc;
 #endif
diff --git a/src/zeitansage/main.c b/src/zeitansage/main.c
index a77d9bd..ede428a 100644
--- a/src/zeitansage/main.c
+++ b/src/zeitansage/main.c
@@ -93,7 +93,7 @@ int main(int argc, char *argv[])
 	fm_init(fast_math);
 	zeit_init(audio_level_dBm, alerting);
 
-	main_mobile("zeitansage", &quit, latency, interval, NULL, "1191", 4);
+	main_mobile("zeitansage", &quit, NULL, "1191", 4);
 
 //fail:
 	/* exits */