radio95/fm95
0
1
Fork 0
mirror of https://github.com/radio95-rnt/fm95.git synced 2026-02-26 19:23:51 +01:00
Code Issues Activity

optimize a bit the stereo encoder and in case of read error from the rds or mpx devices just disable them

Browse Source
This commit is contained in:
KubaPro010
2025-06-27 10:42:02 +02:00
parent ee1a6f5c14
commit 9c7018132f
3 changed files with 23 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
modulation/stereo_encoder.c
View File

@@ -13,14 +13,15 @@ void init_stereo_encoder(StereoEncoder* st, uint8_t multiplier, Oscillator* osc,
float stereo_encode(StereoEncoder* st, uint8_t enabled, float left, float right) {
float mid = (left+right) * 0.5f;
if(!enabled) return mid * st->mono_volume;
float side = (left-right) * 0.5f;
float signalx1 = get_oscillator_sin_multiplier_ni(st->osc, st->multiplier);
if(!st->polar) {
float pilot = get_oscillator_sin_multiplier_ni(st->osc, st->multiplier);
float carrier = get_oscillator_sin_multiplier_ni(st->osc, st->multiplier * 2.0f);
return (mid*st->mono_volume) + (pilot*st->pilot_volume) + ((side*carrier) * st->stereo_volume);
float signalx2 = get_oscillator_sin_multiplier_ni(st->osc, st->multiplier * 2.0f);
return (mid*st->mono_volume) + (signalx1*st->pilot_volume) + ((side*signalx2) * st->stereo_volume);
} else {
float carrier = get_oscillator_sin_multiplier_ni(st->osc, st->multiplier);
return (mid*st->mono_volume) + (((side+0.2f)*carrier) * st->stereo_volume); // Polar stereo does not contain a pilot, but it contains a -14 db carrier wave on the stereo subcarrier
return (mid*st->mono_volume) + (((side+0.2f)*signalx1) * st->stereo_volume); // Polar stereo does not contain a pilot, but it contains a -14 db carrier wave on the stereo subcarrier
}
}