radio95/fm95
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Code Issues Activity

what the fuck is the problem (also aveRAGE)

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This commit is contained in:
kuba
2025-07-08 23:12:16 +02:00
parent f937bd81b7
commit de8a36e431
2 changed files with 11 additions and 12 deletions
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filter/bs412.c
+9 -10
View File
@@ -13,8 +13,8 @@ inline float deviation_to_dbr(float deviation) {
void init_bs412(BS412Compressor* mpx, float mpx_deviation, float target_power, float attack, float release, int sample_rate) { void init_bs412(BS412Compressor* mpx, float mpx_deviation, float target_power, float attack, float release, int sample_rate) {
mpx->mpx_deviation = mpx_deviation; mpx->mpx_deviation = mpx_deviation;
mpx->sample_counter = 0; mpx->average_counter = 0;
mpx->sample = 0; mpx->average = 0;
mpx->sample_rate = sample_rate; mpx->sample_rate = sample_rate;
mpx->attack = expf(-1.0f / (attack * sample_rate)); mpx->attack = expf(-1.0f / (attack * sample_rate));
mpx->release = expf(-1.0f / (release * sample_rate)); mpx->release = expf(-1.0f / (release * sample_rate));
@@ -26,11 +26,10 @@ void init_bs412(BS412Compressor* mpx, float mpx_deviation, float target_power, f
} }
float bs412_compress(BS412Compressor* mpx, float sample) { float bs412_compress(BS412Compressor* mpx, float sample) {
mpx->sample += sample * sample * mpx->mpx_deviation; // rmS mpx->average += (sample * sample) * mpx->mpx_deviation; // rmS
mpx->sample_counter++; mpx->average_counter++;
float inv_counter = 1.0f / mpx->sample_counter; float avg_deviation = sqrtf(mpx->average / mpx->average_counter); // RMs
float avg_deviation = sqrtf(mpx->sample * inv_counter); // RMs
float modulation_power = deviation_to_dbr(avg_deviation); float modulation_power = deviation_to_dbr(avg_deviation);
#ifdef BS412_DEBUG #ifdef BS412_DEBUG
@@ -39,12 +38,12 @@ float bs412_compress(BS412Compressor* mpx, float sample) {
} }
#endif #endif
if (mpx->sample_counter >= mpx->sample_rate * 60) { if (mpx->average_counter >= mpx->sample_rate * 60) {
#ifdef BS412_DEBUG #ifdef BS412_DEBUG
debug_printf("Resetting MPX power measurement\n"); debug_printf("Resetting MPX power measurement\n");
#endif #endif
mpx->sample = avg_deviation * avg_deviation; mpx->average = avg_deviation * avg_deviation;
mpx->sample_counter = 1; mpx->average_counter = 1;
} }
float gain_target = powf(10.0f, (mpx->target - modulation_power) / 20.0f); // dB to linear float gain_target = powf(10.0f, (mpx->target - modulation_power) / 20.0f); // dB to linear
@@ -53,5 +52,5 @@ float bs412_compress(BS412Compressor* mpx, float sample) {
else else
mpx->gain = mpx->gain * mpx->release + (1.0f - mpx->release) * gain_target; mpx->gain = mpx->gain * mpx->release + (1.0f - mpx->release) * gain_target;
return sample*mpx->gain; return fminf(sample*mpx->gain, dbr_to_deviation(mpx->target*1.1f));
} }
filter/bs412.h
+2 -2
View File
@@ -18,11 +18,11 @@ typedef struct
float attack; float attack;
float release; float release;
float gain; float gain;
double sample; double average;
} BS412Compressor; } BS412Compressor;
float dbr_to_deviation(float dbr); float dbr_to_deviation(float dbr);
float deviation_to_dbr(float deviation); float deviation_to_dbr(float deviation);
void init_bs412(BS412Compressor *mpx, float mpx_deviation, float target_power, float attack, float release, int sample_rate); void init_bs412(BS412Compressor *mpx, float mpx_deviation, float target_power, float attack, float release, int sample_rate);
float bs412_compress(BS412Compressor *mpx, float sample); float bs412_compress(BS412Compressor *mpx, float average);