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C-Netz: Make demodulation algorithm (slope or leve) slectable via option

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By default (auto), the algorithm is selected, depending on sound card
or SDR usage. For testing and debugging purpose, the algorithm can be
forced.
This commit is contained in:
Andreas Eversberg
2017-05-19 19:11:59 +02:00
parent c086e66b7c
commit 76a3484c5c
7 changed files with 55 additions and 12 deletions
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15
src/cnetz/fsk_demod.c
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@@ -135,7 +135,7 @@
#include "dsp.h"
#include "telegramm.h"
int fsk_fm_init(fsk_fm_demod_t *fsk, cnetz_t *cnetz, int samplerate, double bitrate, enum demod_type demod_type)
int fsk_fm_init(fsk_fm_demod_t *fsk, cnetz_t *cnetz, int samplerate, double bitrate, enum demod_type demod)
{
int len, half;
@@ -146,12 +146,19 @@ int fsk_fm_init(fsk_fm_demod_t *fsk, cnetz_t *cnetz, int samplerate, double bitr
}
fsk->cnetz = cnetz;
fsk->demod_type = demod_type;
fsk->demod_type = demod;
if (demod_type == FSK_DEMOD_SLOPE)
switch (demod) {
case FSK_DEMOD_SLOPE:
PDEBUG(DDSP, DEBUG_INFO, "Detecting level change by looking at slope (good for sound cards)\n");
if (demod_type == FSK_DEMOD_LEVEL)
break;
case FSK_DEMOD_LEVEL:
PDEBUG(DDSP, DEBUG_INFO, "Detecting level change by looking zero crosssing (good for SDR)\n");
break;
default:
PDEBUG(DDSP, DEBUG_ERROR, "Wrong demod type, please fix!\n");
abort();
}
len = (int)((double)samplerate / bitrate + 0.5);
half = (int)((double)samplerate / bitrate / 2.0 + 0.5);