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small tweaks (second stage filter

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2026-01-03 19:18:51 -06:00
parent c0c914b40d
commit 539e63f4af
3 changed files with 12 additions and 7 deletions
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1
src/KeyboardController.cpp
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@@ -7,6 +7,7 @@ KeyboardController::KeyboardController(NoteQueue& queue) : queue_(queue) {
// TODO: also configurable via a yml // TODO: also configurable via a yml
keymap_ = { keymap_ = {
{ Qt::Key_Shift, 47 }, // B 2
{ Qt::Key_Z, 48 }, // C 3 { Qt::Key_Z, 48 }, // C 3
{ Qt::Key_S, 49 }, // C# { Qt::Key_S, 49 }, // C#
{ Qt::Key_X, 50 }, // D { Qt::Key_X, 50 }, // D

14
src/synth/Synth.cpp
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@@ -9,7 +9,7 @@
#endif #endif
// TODO: you get it, also in a yml config // TODO: you get it, also in a yml config
#define SYNTH_PITCH_STANDARD 440.0f // frequency of home pitch #define SYNTH_PITCH_STANDARD 432.0f // frequency of home pitch
#define SYNTH_MIDI_HOME 69 // midi note index of home pitch #define SYNTH_MIDI_HOME 69 // midi note index of home pitch
#define SYNTH_NOTES_PER_OCTAVE 12 #define SYNTH_NOTES_PER_OCTAVE 12
@@ -25,7 +25,8 @@ void Synth::updateParams() {
void Synth::setSampleRate(uint32_t sampleRate) { void Synth::setSampleRate(uint32_t sampleRate) {
sampleRate_ = sampleRate; sampleRate_ = sampleRate;
filter_.setSampleRate(static_cast<float>(sampleRate)); filter1_.setSampleRate(static_cast<float>(sampleRate));
filter2_.setSampleRate(static_cast<float>(sampleRate));
} }
inline float Synth::getParam(ParamId id) { inline float Synth::getParam(ParamId id) {
@@ -104,7 +105,7 @@ void Synth::process(float* out, uint32_t nFrames, uint32_t sampleRate) {
} }
// TODO: make pitchOffset variable for each oscillator (maybe three values like octave, semitone offset, and pitch offset in cents) // TODO: make pitchOffset variable for each oscillator (maybe three values like octave, semitone offset, and pitch offset in cents)
float pitchOffset = 1.0f; float pitchOffset = 0.5f;
float phaseInc = pitchOffset * 2.0f * M_PI * frequency_ / static_cast<float>(sampleRate); float phaseInc = pitchOffset * 2.0f * M_PI * frequency_ / static_cast<float>(sampleRate);
float gain = gainEnv * getParam(ParamId::Osc1VolumeDepth); float gain = gainEnv * getParam(ParamId::Osc1VolumeDepth);
@@ -136,8 +137,11 @@ void Synth::process(float* out, uint32_t nFrames, uint32_t sampleRate) {
// filter sample // filter sample
float cutoffFreq = cutoffEnv * pow(2.0f, getParam(ParamId::FilterCutoffDepth)) * frequency_; float cutoffFreq = cutoffEnv * pow(2.0f, getParam(ParamId::FilterCutoffDepth)) * frequency_;
filter_.setParams(Filter::Type::BiquadLowpass, cutoffFreq, resonanceEnv * getParam(ParamId::FilterResonanceDepth)); filter1_.setParams(Filter::Type::BiquadLowpass, cutoffFreq, resonanceEnv * getParam(ParamId::FilterResonanceDepth));
sampleOut = filter_.biquadProcess(sampleOut); filter2_.setParams(Filter::Type::BiquadLowpass, cutoffFreq, resonanceEnv * getParam(ParamId::FilterResonanceDepth));
float filterSample = filter1_.biquadProcess(sampleOut);
filterSample = filter2_.biquadProcess(filterSample);
sampleOut = filterSample;
// write to buffer // write to buffer
out[2*i] = sampleOut; // left out[2*i] = sampleOut; // left

4
src/synth/Synth.h
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@@ -70,7 +70,7 @@ private:
Envelope cutoffEnvelope_; Envelope cutoffEnvelope_;
Envelope resonanceEnvelope_; Envelope resonanceEnvelope_;
// filters, just one for now Filter filter1_;
Filter filter_; Filter filter2_;
}; };