radio95/fm95
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do the preemp gain properly, set a refrence freq (+0db) sligthly above the LPF cutoff, thus we avoid clipping

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KubaPro010
2025-06-09 20:03:44 +02:00
parent bcb9559d59
commit cad6080c07
3 changed files with 14 additions and 8 deletions
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4
src/fm95.c
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@@ -392,8 +392,8 @@ int main(int argc, char **argv) {
iirfilt_rrrf mpx_lpf = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_BUTTER, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, 1, (polar_stereo ? (46250.0f/sample_rate) : (53000.0f/sample_rate)), 0.0f, 1.0f, 1.0f);
ResistorCapacitor preemp_l, preemp_r;
init_preemphasis(&preemp_l, preemphasis_tau, sample_rate);
init_preemphasis(&preemp_r, preemphasis_tau, sample_rate);
init_preemphasis(&preemp_l, preemphasis_tau, sample_rate, 15100.0f);
init_preemphasis(&preemp_r, preemphasis_tau, sample_rate, 15100.0f);
MPXPowerMeasurement power;
init_modulation_power_measure(&power, sample_rate);