radio95/fm95
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add compressor

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KubaPro010
2025-03-01 21:00:56 +01:00
parent 8c9f6464b8
commit b513b98a9a
5 changed files with 278 additions and 15 deletions
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11
src/fm95.c
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@@ -34,7 +34,7 @@
#include <pulse/error.h>
#define MASTER_VOLUME 1.0f // Volume of everything combined, for calibration
#define AUDIO_VOLUME 2.0f // Audio volume, before clipper
#define AUDIO_VOLUME 1.0f // Audio volume, before clipper
#define MONO_VOLUME 0.45f // L+R Signal
#define PILOT_VOLUME 0.09f // 19 KHz Pilot
#define STEREO_VOLUME 0.45f // L-R signal, should be same as MONO
@@ -373,6 +373,9 @@ int main(int argc, char **argv) {
BiquadFilter lpf_l, lpf_r;
init_lpf(&lpf_l, LPF_CUTOFF, 1.25f, SAMPLE_RATE);
init_lpf(&lpf_r, LPF_CUTOFF, 1.25f, SAMPLE_RATE);
StereoCompressor comp;
init_compressor_stereo(&comp, -2.0f, 15.0f, 2.0f, 0.0f, 0.015f, 0.25f, 0.01f, SAMPLE_RATE);
// #endregion
signal(SIGINT, stop);
@@ -413,8 +416,10 @@ int main(int argc, char **argv) {
float current_mpx_in = mpx_in[i];
float current_sca_in = sca_in[i];
float ready_l = apply_frequency_filter(&lpf_l, l_in);
float ready_r = apply_frequency_filter(&lpf_r, r_in);
float ready_r;
float ready_l = peak_compress_stereo(&comp, l_in, r_in, &ready_r);
ready_l = apply_frequency_filter(&lpf_l, l_in);
ready_r = apply_frequency_filter(&lpf_r, r_in);
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);