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FM stereo prototype

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This commit is contained in:
Ryzerth
2021-07-23 06:29:16 +02:00
parent 175e361ccd
commit 8454b40d54
10 changed files with 363 additions and 90 deletions
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40
radio/src/wfm_demod.h
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@ -48,6 +48,7 @@ public:
squelch.init(_vfo->output, squelchLevel);
demod.init(&squelch.out, bbSampRate, bw / 2.0f);
demodStereo.init(&squelch.out, bbSampRate, bw / 2.0f);
float audioBW = std::min<float>(audioSampleRate / 2.0f, 16000.0f);
win.init(audioBW, audioBW, bbSampRate);
@ -63,7 +64,12 @@ public:
void start() {
squelch.start();
demod.start();
if (stereo) {
demodStereo.start();
}
else {
demod.start();
}
resamp.start();
deemp.start();
running = true;
@ -71,7 +77,12 @@ public:
void stop() {
squelch.stop();
demod.stop();
if (stereo) {
demodStereo.stop();
}
else {
demod.stop();
}
resamp.stop();
deemp.stop();
running = false;
@ -176,6 +187,10 @@ public:
_config->conf[uiPrefix]["WFM"]["squelchLevel"] = squelchLevel;
_config->release(true);
}
if (ImGui::Checkbox("Stereo##radio_wfm_demod", &stereo)) {
setStereo(stereo);
}
}
void setDeempIndex(int id) {
@ -197,6 +212,23 @@ public:
bw = bandWidth;
_vfo->setBandwidth(bw, updateWaterfall);
demod.setDeviation(bw / 2.0f);
demodStereo.setDeviation(bw / 2.0f);
}
void setStereo(bool enabled) {
if (running) {
demod.stop();
demodStereo.stop();
}
if (enabled) {
resamp.setInput(demodStereo.out);
if (running) { demodStereo.start(); }
}
else {
resamp.setInput(&demod.out);
if (running) { demod.start(); }
}
}
private:
@ -212,13 +244,17 @@ private:
float audioSampRate = 48000;
float squelchLevel = -100.0f;
float bw = 200000;
bool stereo = false;
int deempId = 0;
float tau = 50e-6;
bool running = false;
VFOManager::VFO* _vfo;
dsp::Squelch squelch;
dsp::FMDemod demod;
dsp::StereoFMDemod demodStereo;
dsp::filter_window::BlackmanWindow win;
dsp::PolyphaseResampler<dsp::stereo_t> resamp;
dsp::BFMDeemp deemp;