radio95/fm95
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Code Issues Activity

tilt correction? (yes, ai wrote it, you hate me because of that? find a tilt filter yourself then that you can copy the code of)

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KubaPro010
2025-07-08 19:54:15 +02:00
parent 8932a9a24d
commit 52f2f61a9a
3 changed files with 64 additions and 1 deletions
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9
src/fm95.c
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@@ -65,6 +65,7 @@ typedef struct
float clipper_threshold;
float preemphasis;
float tilt;
uint8_t calibration;
float mpx_power;
float mpx_deviation;
@@ -168,6 +169,9 @@ int run_fm95(const FM95_Config config, FM95_Runtime* runtime) {
MPXPowerMeasurement power;
init_modulation_power_measure(&power, config.sample_rate);
TiltCorrectionFilter tilter;
tilt_init(&tilter, config.tilt);
StereoEncoder stencode;
init_stereo_encoder(&stencode, 4.0f, &osc, (config.stereo == 2), config.volumes.mono, config.volumes.pilot, config.volumes.stereo);
@@ -248,7 +252,7 @@ int run_fm95(const FM95_Config config, FM95_Runtime* runtime) {
mpx *= bs412_audio_gain;
output[i] = hard_clip((mpx_in[i]+mpx)*config.master_volume, 1.0); // Ensure peak deviation of 75 khz, assuming we're calibrated correctly (lower)
output[i] = hard_clip(tilt(&tilter, (mpx_in[i]+mpx))*config.master_volume, 1.0); // Ensure peak deviation of 75 khz, assuming we're calibrated correctly (lower)
advance_oscillator(&osc);
}
@@ -365,6 +369,8 @@ static int config_handler(void* user, const char* section, const char* name, con
pconfig->volumes.rds = strtof(value, NULL);
} else if(MATCH("volumes", "rds_step")) {
pconfig->volumes.rds_step = strtof(value, NULL);
} else if(MATCH("fm95", "tilt")) {
pconfig->tilt = strtof(value, NULL);
} else {
return 0; // Unknown section/name
}
@@ -452,6 +458,7 @@ int main(int argc, char **argv) {
.clipper_threshold = DEFAULT_CLIPPER_THRESHOLD,
.preemphasis = DEFAULT_PREEMPHASIS_TAU,
.tilt = 0,
.calibration = 0,
.mpx_power = DEFAULT_MPX_POWER,
.mpx_deviation = DEFAULT_MPX_DEVIATION,