radio95/fm95
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cascade 2 lpfs

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KubaPro010
2025-03-08 21:28:09 +01:00
parent 2b720500de
commit 2e89aa4457
1 changed files with 9 additions and 5 deletions
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14
src/fm95.c
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@@ -372,9 +372,11 @@ int main(int argc, char **argv) {
init_preemphasis(&preemp_r, preemphasis_tau, SAMPLE_RATE);
// Use https://www.earlevel.com/main/2021/09/02/biquad-calculator-v3/
BiquadFilter lpf_l, lpf_r;
init_lpf(&lpf_l, LPF_CUTOFF, 0.70710678f, SAMPLE_RATE);
init_lpf(&lpf_r, LPF_CUTOFF, 0.70710678f, SAMPLE_RATE);
BiquadFilter lpf_l1, lpf_r1, lpf_l2, lpf_r2;
init_lpf(&lpf_l1, LPF_CUTOFF, 0.70710678f, SAMPLE_RATE);
init_lpf(&lpf_r1, LPF_CUTOFF, 0.70710678f, SAMPLE_RATE);
init_lpf(&lpf_l2, LPF_CUTOFF, 0.70710678f, SAMPLE_RATE);
init_lpf(&lpf_r2, LPF_CUTOFF, 0.70710678f, SAMPLE_RATE);
// #endregion
signal(SIGINT, stop);
@@ -415,8 +417,10 @@ int main(int argc, char **argv) {
float current_mpx_in = mpx_in[i];
float current_sca_in = sca_in[i];
float ready_l = apply_biquad(&lpf_l, l_in);
float ready_r = apply_biquad(&lpf_r, r_in);
float ready_l = apply_biquad(&lpf_l1, l_in);
float ready_r = apply_biquad(&lpf_r1, r_in);
ready_l = apply_biquad(&lpf_l2, ready_l);
ready_r = apply_biquad(&lpf_r2, ready_r);
ready_l = apply_preemphasis(&preemp_l, ready_l)*2;
ready_r = apply_preemphasis(&preemp_r, ready_r)*2;
ready_l = hard_clip(ready_l*audio_volume, clipper_threshold);