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kuba
2025-01-23 10:03:39 +01:00
parent 43521d90a8
commit 7096a6e572
13 changed files with 106 additions and 300 deletions
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src/polar_stereo_coder.c
+14 -14
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@@ -33,7 +33,7 @@
volatile sig_atomic_t to_run = 1;
float clip(float sample) {
float hard_clip(float sample) {
if (sample > CLIPPER_THRESHOLD) {
return CLIPPER_THRESHOLD; // Clip to the upper threshold
} else if (sample < -CLIPPER_THRESHOLD) {
@@ -122,11 +122,11 @@ int main() {
init_oscillator(&stereo_osc, 31250.0, SAMPLE_RATE);
#ifdef PREEMPHASIS
ResistorCapacitor preemp_l, preemp_r;
init_rc(&preemp_l, PREEMPHASIS_TAU, SAMPLE_RATE);
init_rc(&preemp_r, PREEMPHASIS_TAU, SAMPLE_RATE);
init_rc_tau(&preemp_l, PREEMPHASIS_TAU, SAMPLE_RATE);
init_rc_tau(&preemp_r, PREEMPHASIS_TAU, SAMPLE_RATE);
#endif
#ifdef LPF
LowPassFilter lpf_l, lpf_r;
ResistorCapacitor lpf_l, lpf_r;
init_low_pass_filter(&lpf_l, LPF_CUTOFF, SAMPLE_RATE);
init_low_pass_filter(&lpf_r, LPF_CUTOFF, SAMPLE_RATE);
#endif
@@ -156,23 +156,23 @@ int main() {
float lowpassed_right = apply_low_pass_filter(&lpf_r, r_in);
float preemphasized_left = apply_pre_emphasis(&preemp_l, lowpassed_left);
float preemphasized_right = apply_pre_emphasis(&preemp_r, lowpassed_right);
float current_left_input = clip(preemphasized_left);
float current_right_input = clip(preemphasized_right);
float current_left_input = hard_clip(preemphasized_left);
float current_right_input = hard_clip(preemphasized_right);
#else
float preemphasized_left = apply_pre_emphasis(&preemp_l, l_in);
float preemphasized_right = apply_pre_emphasis(&preemp_r, r_in);
float current_left_input = clip(preemphasized_left);
float current_right_input = clip(preemphasized_right);
float current_left_input = hard_clip(preemphasized_left);
float current_right_input = hard_clip(preemphasized_right);
#endif
#else
#ifdef LPF
float lowpassed_left = apply_low_pass_filter(&lpf_l, l_in);
float lowpassed_right = apply_low_pass_filter(&lpf_r, r_in);
float current_left_input = clip(lowpassed_left);
float current_right_input = clip(lowpassed_right);
float current_left_input = hard_clip(lowpassed_left);
float current_right_input = hard_clip(lowpassed_right);
#else
float current_left_input = clip(l_in);
float current_right_input = clip(r_in);
float current_left_input = hard_clip(l_in);
float current_right_input = hard_clip(r_in);
#endif
#endif
@@ -180,10 +180,10 @@ int main() {
float stereo = (current_left_input - current_right_input) / 2.0f; // Also Stereo to Mono but a bit diffrent
float stereo_carrier = get_oscillator_sin_sample(&stereo_osc);
// 14 db is somewhere around 20% of a 1 volt signal
// -14 db is somewhere around 20% of a 1 volt signal
mpx[i] = mono * MONO_VOLUME +
((stereo+0.2) * stereo_carrier)*STEREO_VOLUME;
((stereo+0.2) * stereo_carrier)*STEREO_VOLUME; // the 0.2 add DC, you know what happens then? Carrier wave
}
if (pa_simple_write(output_device, mpx, sizeof(mpx), &pulse_error) < 0) {