radio95/fm95
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minor changes and optimizations

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KubaPro010
2026-02-19 16:33:05 +01:00
parent eb4ec561ec
commit 9a1352febc
3 changed files with 7 additions and 8 deletions
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7
filter/bs412.c
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@@ -1,6 +1,7 @@
#include "bs412.h"
#define BS412_TIME 60
#define CLAMP(x, lo, hi) (((x) < (lo)) ? (lo) : ((x) > (hi) ? (hi) : (x)))
#define SQRT19000 180499999.99999997f // (19000 / sqrt(2)) * 19000 / sqrt(2)
@@ -71,14 +72,14 @@ float bs412_compress(BS412Compressor* comp, float audio, float sample_mpx) {
return combined;
}
float target_gain = powf(10.0f, (comp->target - modulation_power) / 10.0f);
float target_gain = expf((comp->target - modulation_power) * 0.2302585093f); // 1/10 * ln(10)
if (modulation_power > comp->target) comp->gain = comp->attack * comp->gain + (1.0f - comp->attack) * target_gain;
else comp->gain = comp->release * comp->gain + (1.0f - comp->release) * target_gain;
comp->gain = fmaxf(0.0f, fminf(2.0f, comp->gain));
comp->gain = CLAMP(comp->gain, 0.0f, comp->max_gain);
float output_sample = (audio * comp->gain) + sample_mpx;
if(deviation_to_dbr(avg_deviation * comp->gain) > comp->target && deviation_to_dbr(avg_deviation) < comp->target) {
if(deviation_to_dbr(avg_deviation * comp->gain) > comp->target && modulation_power < comp->target) {
// Gain is too much, reduce
float overshoot_dbr = deviation_to_dbr(avg_deviation * comp->gain) - comp->target;
float reduction_factor = powf(10.0f, -overshoot_dbr / 10.0f);