radio95/fm95
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Code Issues Activity

bug is 100% related to bs412

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This commit is contained in:
KubaPro010
2025-05-31 11:51:26 +02:00
parent 82a74db8b1
commit 4fdb2dff0d
2 changed files with 2 additions and 9 deletions
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4
dsp/bs412.c
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@@ -3,12 +3,12 @@
#define LOG2_19000 log2f(19000.0f)
inline float dbr_to_deviation(float dbr) {
return 19000.0f * powf(10.0f, dbr / 20.0f);
return 19000.0f * powf(2.0f, dbr * 0.332193f);
}
inline float deviation_to_dbr(float deviation) {
if(deviation == 0.0f) return -100.0f;
return 20.0f * (log2f(deviation) - LOG2_19000) * 0.30103f;
return 10.0f * (log2f(deviation) - LOG2_19000) * 0.30103f;
}
void init_modulation_power_measure(MPXPowerMeasurement* mpx, int sample_rate) {

7
src/fm95.c
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@@ -578,13 +578,6 @@ int main(int argc, char **argv) {
float target_gain = dbr_to_deviation(-excess_power)/mpx_deviation;
bs412_audio_gain = 0.9f * bs412_audio_gain + 0.1f * target_gain;
audio *= bs412_audio_gain;
} else if (peak_mpower > (mpx_power + 0.1f)) {
float excess_power = peak_mpower - mpx_power - 0.1f;
excess_power = deviation_to_dbr(dbr_to_deviation(excess_power) - dbr_to_deviation(peak_mpx_only));
float target_gain = dbr_to_deviation(-excess_power)/mpx_deviation;
bs412_audio_gain = 0.8f * bs412_audio_gain + 0.2f * target_gain;
audio *= bs412_audio_gain;
}
iirfilt_rrrf_execute(mpx_lpf, audio, &audio); // Should have no effect, as audio should be 0-15, and 23-53, this is a filter for 53, assuming the filter is good, this is precaution and recomendation