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C-Netz: SDR now uses zero-crossing to detect level changes.

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This does not work with analog radio, but with SDR it works.
The quality should be better and the process is faster.
This commit is contained in:
Andreas Eversberg
2017-05-17 12:21:19 +02:00
parent 07e45103ef
commit ef7ff26793
7 changed files with 168 additions and 59 deletions
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4
src/cnetz/dsp.c
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@@ -83,7 +83,7 @@ static void dsp_init_ramp(cnetz_t *cnetz)
}
/* Init transceiver instance. */
int dsp_init_sender(cnetz_t *cnetz, int measure_speed, double clock_speed[2])
int dsp_init_sender(cnetz_t *cnetz, int measure_speed, double clock_speed[2], int use_sdr)
{
int rc = 0;
double size;
@@ -136,7 +136,7 @@ int dsp_init_sender(cnetz_t *cnetz, int measure_speed, double clock_speed[2])
/* reinit the sample rate to shrink/expand audio */
init_samplerate(&cnetz->sender.srstate, 8000.0, (double)cnetz->sender.samplerate / 1.1, 3300.0); /* 66 <-> 60 */
rc = fsk_fm_init(&cnetz->fsk_demod, cnetz, cnetz->sender.samplerate, (double)BITRATE / (1.0 + clock_speed[0] / 1000000.0));
rc = fsk_fm_init(&cnetz->fsk_demod, cnetz, cnetz->sender.samplerate, (double)BITRATE / (1.0 + clock_speed[0] / 1000000.0), (use_sdr) ? FSK_DEMOD_LEVEL : FSK_DEMOD_SLOPE);
if (rc < 0)
goto error;