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fixed filter issues

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2025-12-28 00:21:44 -06:00
parent b36d68ae99
commit bfcdd189f7
8 changed files with 167 additions and 31 deletions
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9
src/synth/Synth.cpp
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@@ -87,8 +87,9 @@ void Synth::process(float* out, uint32_t nFrames, uint32_t sampleRate) {
gainEnvelope_.set(getParam(ParamId::Osc1VolumeEnvA), getParam(ParamId::Osc1VolumeEnvD), getParam(ParamId::Osc1VolumeEnvS), getParam(ParamId::Osc1VolumeEnvR));
cutoffEnvelope_.set(getParam(ParamId::FilterCutoffEnvA), getParam(ParamId::FilterCutoffEnvD), getParam(ParamId::FilterCutoffEnvS), getParam(ParamId::FilterCutoffEnvR));
resonanceEnvelope_.set(getParam(ParamId::FilterResonanceEnvA), getParam(ParamId::FilterResonanceEnvD), getParam(ParamId::FilterResonanceEnvS), getParam(ParamId::FilterResonanceEnvR));
float gain = gainEnvelope_.process();
filter_.setParams(Filter::Type::BiquadLowpass, cutoffEnvelope_.process(), resonanceEnvelope_.process());
float gainEnv = gainEnvelope_.process();
float cutoffEnv = cutoffEnvelope_.process();
float resonanceEnv = resonanceEnvelope_.process();
// TODO: envelope is shared between all notes so this sequence involves a note change but only one envelope attack:
// NOTE_A_ON > NOTE_B_ON > NOTE_A_OFF and note B starts playing part-way through note A's envelope
@@ -106,6 +107,8 @@ void Synth::process(float* out, uint32_t nFrames, uint32_t sampleRate) {
float pitchOffset = 0.5f;
float phaseInc = pitchOffset * 2.0f * M_PI * frequency_ / static_cast<float>(sampleRate);
float gain = gainEnv * getParam(ParamId::Osc1Volume);
// sample generation
// TODO: wavetables
// TODO: wavetables should be scaled by their RMS for equal loudness (prelim standard = 0.707)
@@ -132,6 +135,8 @@ void Synth::process(float* out, uint32_t nFrames, uint32_t sampleRate) {
}
// filter sample
float cutoffFreq = cutoffEnv * pow(2.0f, getParam(ParamId::FilterCutoff)) * frequency_;
filter_.setParams(Filter::Type::BiquadLowpass, cutoffFreq, resonanceEnv * getParam(ParamId::FilterResonance));
sampleOut = filter_.biquadProcess(sampleOut);
// write to buffer