B-Netz / NMT: minor changes at signal detection
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@ -505,11 +505,11 @@ void bnetz_receive_telegramm(bnetz_t *bnetz, uint16_t telegramm, double quality,
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{
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int digit = 0;
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int i;
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int quality_percent = quality * 100;
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int level_percent = level * 100;
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PDEBUG(DFRAME, DEBUG_INFO, "RX Level: %.0f%% Quality=%.0f\n", level * 100.0 + 0.5, quality * 100.0 + 0.5);
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/* drop any telegramm that is too bad */
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if (quality_percent < 20)
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if (quality < 0.2)
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return;
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for (i = 0; impulstelegramme[i].digit; i++) {
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@ -519,9 +519,9 @@ void bnetz_receive_telegramm(bnetz_t *bnetz, uint16_t telegramm, double quality,
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}
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}
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if (digit == 0)
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PDEBUG(DBNETZ, DEBUG_DEBUG, "Received unknown telegramm '0x%04x'. (quality=%d%% level=%d%%)\n", telegramm, quality_percent, level_percent);
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PDEBUG(DBNETZ, DEBUG_DEBUG, "Received unknown telegramm '0x%04x'.\n", telegramm);
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else
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PDEBUG(DBNETZ, (bnetz->sender.loopback) ? DEBUG_NOTICE : DEBUG_DEBUG, "Received telegramm '%s'. (quality=%d%% level=%d%%)\n", impulstelegramme[i].description, quality_percent, level_percent);
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PDEBUG(DBNETZ, (bnetz->sender.loopback) ? DEBUG_NOTICE : DEBUG_DEBUG, "Received telegramm '%s'.\n", impulstelegramme[i].description);
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if (bnetz->sender.loopback) {
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if (digit >= '0' && digit <= '9') {
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@ -661,7 +661,7 @@ void bnetz_receive_telegramm(bnetz_t *bnetz, uint16_t telegramm, double quality,
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break;
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case BNETZ_GESPRAECH:
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/* only good telegramms shall pass */
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if (quality_percent < 70)
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if (quality < 0.7)
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return;
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if (digit == 't') {
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PDEBUG(DBNETZ, DEBUG_NOTICE, "Received 'Schlusssignal' from mobile station\n");
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@ -303,41 +303,45 @@ static inline void fsk_decode_step(nmt_t *nmt, int pos)
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nmt->rx_sample_count += nmt->fsk_filter_step;
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level = audio_level(spl, max);
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/* limit level to prevent division by zero */
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if (level < 0.01)
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level = 0.01;
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// level = 0.63662 / 2.0;
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audio_goertzel(spl, max, pos, nmt->fsk_coeff, result, 2);
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/* calculate soft bit from both frequencies */
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softbit = (result[1] / level - result[0] / level + 1.0) / 2.0;
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//printf("%.3f: %.3f\n", level, softbit);
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/* scale it, since both filters overlap by some percent */
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#define MIN_QUALITY 0.33
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softbit = (softbit - MIN_QUALITY) / (1.0 - MIN_QUALITY - MIN_QUALITY);
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if (softbit > 1)
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softbit = 1;
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if (softbit < 0)
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softbit = 0;
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#ifdef DEBUG_FILTER
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// printf("|%s", show_level(result[0]/level*100));
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// printf("|%s| low=%.3f high=%.3f level=%d\n", show_level(result[1]/level*100), result[0]/level, result[1]/level, (int)level);
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printf("|%s| softbit=%.3f\n", show_level(softbit * 100), softbit);
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#endif
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if (softbit > 1)
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softbit = 1;
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if (softbit < 0)
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softbit = 0;
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if (softbit > 0.5)
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bit = 1;
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else
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bit = 0;
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if (nmt->fsk_filter_bit != bit) {
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/* if we have a bit change, reset sample counter to one half bit duration */
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#ifdef DEBUG_FILTER
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puts("bit change");
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#endif
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/* if we have a bit change, reset sample counter to one half bit duration */
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nmt->fsk_filter_bit = bit;
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nmt->fsk_filter_sample = 5;
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} else if (--nmt->fsk_filter_sample == 0) {
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/* if sample counter bit reaches 0, we reset sample counter to one bit duration */
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#ifdef DEBUG_FILTER
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puts("sample");
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#endif
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/* if sample counter bit reaches 0, we reset sample counter to one bit duration */
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// quality = result[bit] / level;
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if (softbit > 0.5)
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quality = softbit * 2.0 - 1.0;
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@ -1124,9 +1124,10 @@ void nmt_receive_frame(nmt_t *nmt, const char *bits, double quality, double leve
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frame_t frame;
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int rc;
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PDEBUG(DFRAME, DEBUG_INFO, "RX Level: %.0f%% Quality=%.0f\n", level * 100.0 + 0.5, quality * 100.0 + 0.5);
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rc = decode_frame(&frame, bits, (nmt->sender.loopback) ? MTX_TO_XX : XX_TO_MTX, (nmt->state == STATE_MT_PAGING));
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if (rc < 0) {
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PDEBUG(DFRAME, DEBUG_INFO, "RX Level: %.0f%% Quality=%.0f\n", level * 100.0, quality * 100.0);
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PDEBUG(DNMT, (nmt->sender.loopback) ? DEBUG_NOTICE : DEBUG_DEBUG, "Received invalid frame.\n");
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return;
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}
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@ -1134,7 +1135,6 @@ void nmt_receive_frame(nmt_t *nmt, const char *bits, double quality, double leve
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/* frame counter */
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nmt->rx_frame_count += (int)(frames_elapsed + 0.5);
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PDEBUG(DFRAME, DEBUG_INFO, "RX Level: %.0f%% Quality=%.0f\n", level * 100.0, quality * 100.0);
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PDEBUG(DNMT, (nmt->sender.loopback) ? DEBUG_NOTICE : DEBUG_DEBUG, "Received frame %s\n", nmt_frame_name(frame.index));
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if (nmt->sender.loopback)
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