radio95/fm95
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Code Issues Activity

try to add a lpf

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KubaPro010
2025-03-27 18:00:05 +01:00
parent 66ca7317d5
commit 7ff33aa5a7
4 changed files with 56 additions and 4 deletions
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8
src/fm95.c
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@@ -404,7 +404,6 @@ int main(int argc, char **argv) {
return 0;
}
// #region Setup Filters/Modulaltors/Oscillators
Oscillator osc;
init_oscillator(&osc, polar_stereo ? 31250.0 : 4750, sample_rate);
@@ -414,7 +413,10 @@ int main(int argc, char **argv) {
ResistorCapacitor preemp_l, preemp_r;
init_preemphasis(&preemp_l, preemphasis_tau, sample_rate);
init_preemphasis(&preemp_r, preemphasis_tau, sample_rate);
// #endregion
Biquad lpf_l, lpf_r;
init_butterworth_lpf(&lpf_l, 15000, 192000);
init_butterworth_lpf(&lpf_r, 15000, 192000);
signal(SIGINT, stop);
signal(SIGTERM, stop);
@@ -471,6 +473,8 @@ int main(int argc, char **argv) {
float ready_l = apply_preemphasis(&preemp_l, l_in);
float ready_r = apply_preemphasis(&preemp_r, r_in);
ready_l = biquad(&lpf_l, ready_l);
ready_l = biquad(&lpf_r, ready_r);
ready_l = hard_clip(ready_l*audio_volume, clipper_threshold);
ready_r = hard_clip(ready_r*audio_volume, clipper_threshold);