radio95/fm95
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make it so bs412 reduces the audio level

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This commit is contained in:
KubaPro010
2025-03-30 20:05:25 +02:00
parent 09049a3a1c
commit b23db0d109
2 changed files with 15 additions and 12 deletions
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2
.vscode/.server-controller-port.log vendored
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@@ -1,5 +1,5 @@
{
"port": 13452,
"time": 1743284210487,
"time": 1743357198315,
"version": "0.0.3"
}

25
src/fm95.c
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@@ -487,6 +487,9 @@ int main(int argc, char **argv) {
}
for (int i = 0; i < BUFFER_SIZE; i++) {
float mpx = 0.0f;
float audio = 0.0f;
float l_in = left[i];
float r_in = right[i];
float current_mpx_in = mpx_in[i];
@@ -500,42 +503,42 @@ int main(int argc, char **argv) {
ready_r = hard_clip(ready_r*audio_volume, clipper_threshold);
float mono = (ready_l + ready_r) / 2.0f;
output[i] = mono*MONO_VOLUME;
audio = mono*MONO_VOLUME;
float stereo_carrier = 0.0f;
if(stereo) {
float stereo = (ready_l - ready_r) / 2.0f;
stereo_carrier = get_oscillator_sin_multiplier_ni(&osc, polar_stereo ? 1 : 8);
if(polar_stereo) {
output[i] += ((stereo+0.2)*stereo_carrier)*STEREO_VOLUME;
audio += ((stereo+0.2)*stereo_carrier)*STEREO_VOLUME;
} else {
float pilot = get_oscillator_sin_multiplier_ni(&osc, 4);
output[i] += pilot*PILOT_VOLUME +
(stereo*stereo_carrier)*STEREO_VOLUME;
mpx += pilot*PILOT_VOLUME;
audio += (stereo*stereo_carrier)*STEREO_VOLUME;
}
}
if(rds_on && polar_stereo == 0) {
float rds_carrier = get_oscillator_cos_multiplier_ni(&osc, 12);
output[i] += (current_rds_in*rds_carrier)*RDS_VOLUME;
mpx += (current_rds_in*rds_carrier)*RDS_VOLUME;
if(!sca_on) {
float rds2_carrier_66 = get_oscillator_cos_multiplier_ni(&osc, 14);
output[i] += (current_rds2_in*rds2_carrier_66)*RDS2_VOLUME;
mpx += (current_rds2_in*rds2_carrier_66)*RDS2_VOLUME;
}
}
if(mpx_on) output[i] += hard_clip(current_mpx_in, MPX_CLIPPER_THRESHOLD)*MPX_VOLUME;
if(sca_on) output[i] += modulate_fm(&sca_mod, hard_clip(current_sca_in, sca_clipper_threshold))*SCA_VOLUME;
if(mpx_on) mpx += hard_clip(current_mpx_in, MPX_CLIPPER_THRESHOLD)*MPX_VOLUME;
if(sca_on) mpx += modulate_fm(&sca_mod, hard_clip(current_sca_in, sca_clipper_threshold))*SCA_VOLUME;
float mpower = measure_mpx(&power, output[i] * 75000);
float mpower = measure_mpx(&power, (audio+mpx) * 75000);
if (mpower > mpx_power) {
float excess_power = mpower - mpx_power;
float reduction_factor_db = excess_power;
float reduction_factor_linear = powf(10.0f, -reduction_factor_db / 20.0f);
output[i] *= reduction_factor_linear;
audio *= reduction_factor_linear;
}
output[i] *= master_volume;
output[i] = (audio+mpx)*master_volume;
if(rds_on || stereo) advance_oscillator(&osc);
}