An implementation of Analog cellular networks like A-Netz, B-Netz, C-Netz, NMT, AMPS, TACS, JTACS, Radiocom 2000, IMTS, MPT1327, Eurosignal and more http://osmocom-analog.eversberg.eu/
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osmocom-analog/src/anetz/anetz.h

47 lines
1.8 KiB

#include "../common/sender.h"
enum dsp_mode {
DSP_MODE_SILENCE, /* send silence to transmitter, block audio from receiver */
DSP_MODE_AUDIO, /* stream audio */
DSP_MODE_TONE, /* send 2280 Hz tone 0 */
DSP_MODE_PAGING, /* send four paging tones */
};
enum anetz_state {
ANETZ_FREI, /* sending 2280 Hz tone */
ANETZ_GESPRAECH, /* during conversation */
ANETZ_ANRUF, /* phone is paged */
};
typedef struct anetz {
sender_t sender;
/* sender's states */
enum anetz_state state; /* current sender's state */
char station_id[8]; /* current station ID */
struct timer timer;
/* dsp states */
enum dsp_mode dsp_mode; /* current mode: audio, durable tone 0 or 1, paging */
int fsk_tone_coeff; /* coefficient k = 2*cos(2*PI*f/samplerate), k << 15 */
int samples_per_chunk; /* how many samples lasts one chunk */
int16_t *fsk_filter_spl; /* array with samples_per_chunk */
int fsk_filter_pos; /* current sample position in filter_spl */
int tone_detected; /* what tone has been detected */
int tone_count; /* how long has that tone been detected */
double tone_phaseshift256; /* how much the phase of sine wave changes per sample */
double tone_phase256; /* current phase */
double paging_phaseshift256[4];/* how much the phase of sine wave changes per sample */
double paging_phase256[4]; /* current phase */
int paging_tone; /* current tone (0..3) in sequenced mode */
int paging_count; /* current sample count of tone in seq. mode */
} anetz_t;
double anetz_kanal2freq(int kanal, int unterband);
int anetz_init(void);
int anetz_create(const char *sounddev, int samplerate, int kanal, int loopback, double loss_volume);
void anetz_destroy(sender_t *sender);
void anetz_loss_indication(anetz_t *anetz);
void anetz_receive_tone(anetz_t *anetz, int bit);