radio95/fm95
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that didn't work

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This commit is contained in:
KubaPro010
2025-01-01 02:40:44 +01:00
parent f28dc739d1
commit 8674c8bd80
1 changed files with 2 additions and 4 deletions
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6
src/ssb_stereo_coder.c
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@@ -126,8 +126,6 @@ int main() {
init_hilbert(&hilbert); init_hilbert(&hilbert);
DelayLine monoDelay; DelayLine monoDelay;
init_delay_line(&monoDelay, 99); init_delay_line(&monoDelay, 99);
LowPassFilter ssb_lpf;
init_low_pass_filter(&ssb_lpf, 38150, SAMPLE_RATE);
#ifdef PREEMPHASIS #ifdef PREEMPHASIS
Emphasis preemp_l, preemp_r; Emphasis preemp_l, preemp_r;
init_emphasis(&preemp_l, PREEMPHASIS_TAU, SAMPLE_RATE); init_emphasis(&preemp_l, PREEMPHASIS_TAU, SAMPLE_RATE);
@@ -190,11 +188,11 @@ int main() {
float stereo = (current_left_input - current_right_input) / 2.0f; // Also Stereo to Mono but a bit diffrent float stereo = (current_left_input - current_right_input) / 2.0f; // Also Stereo to Mono but a bit diffrent
float stereo_i, stereo_q; float stereo_i, stereo_q;
apply_hilbert(&hilbert, stereo, &stereo_i, &stereo_q); // I/Q, the Quadrature data is 90 degrees apart from the In-phase data apply_hilbert(&hilbert, stereo, &stereo_i, &stereo_q); // I/Q, the Quadrature data is 90 degrees apart from the In-phase data
float lsb = (stereo_i*cos38-stereo_q*(sin38*0.75f)); // Compute LSB, as the Hilbert isn't perfect, i'll have to a bit silence down the Q carrier in order to make it better, also, it is just perfect as FM Stereo LSB shouldn't be fully LSB float lsb = (stereo_i*cos38-stereo_q*(sin38*0.73f)); // Compute LSB, as the Hilbert isn't perfect, i'll have to a bit silence down the Q carrier in order to make it better, also, it is just perfect as FM Stereo LSB shouldn't be fully LSB
mpx[i] = delay_line(&monoDelay, mono) * MONO_VOLUME + mpx[i] = delay_line(&monoDelay, mono) * MONO_VOLUME +
pilot * PILOT_VOLUME + pilot * PILOT_VOLUME +
apply_low_pass_filter(&ssb_lpf, lsb)/6 *STEREO_VOLUME; lsb *STEREO_VOLUME;
} }
if (pa_simple_write(output_device, mpx, sizeof(mpx), NULL) < 0) { if (pa_simple_write(output_device, mpx, sizeof(mpx), NULL) < 0) {