void processAudio(AudioBuffer &buffer) {
float tune = getParameterValue(PARAMETER_A)*10.0 - 6.0;
float fc = getParameterValue(PARAMETER_B)*10.0 - 4.0;
float q = getParameterValue(PARAMETER_C)*3+0.75;
float shape = getParameterValue(PARAMETER_E)*2;
float pw = 0.5;
if(shape > 1.0){
pw += 0.49*(shape-1.0); // pw 0.5 to 0.99
shape = 1.0; // square wave
}
float df = getParameterValue(PARAMETER_D)*4;
int di = (int)df;
float gain = 0.0f;
switch(di){
// a/d
case 0: // l/s
env.setAttack(1.0-df);
env.setRelease(0.0);
break;
case 1: // s/s
env.setAttack(0.0);
env.setRelease(df-1);
break;
case 2: // s/l
env.setAttack(df-2);
env.setRelease(1.0);
break;
case 3: // l/l
env.setAttack(1.0);
env.setRelease(1.0);
gain = df-3;
break;
}
env.trigger(isButtonPressed(PUSHBUTTON), getSamplesSinceButtonPressed(PUSHBUTTON));
FloatArray left = buffer.getSamples(LEFT_CHANNEL);
FloatArray right = buffer.getSamples(RIGHT_CHANNEL);
// vco
hz.setTune(tune);
float lfreq = hz.getFrequency(left[0]);
osc.setFrequency(lfreq);
osc.setShape(shape);
osc.setPulseWidth(pw);
osc.getSamples(left);
// vcf
hz.setTune(fc);
fc = hz.getFrequency(right[0]);
fc = min(0.999, max(0.01, fc/(getSampleRate()*2))); // normalised and bounded
filter->setLowPass(fc, q);
right.copyFrom(left);
filter->process(right);
right.multiply(0.8-q*0.2); // gain compensation for high q
// vca
env.getEnvelope(envelope);
envelope.add(gain);
left.multiply(envelope);
right.multiply(envelope);
}
void processAudio(AudioBuffer &buffer){
float cutoff=getParameterValue(PARAMETER_A);
float resonance=10*getParameterValue(PARAMETER_B);
FloatArray fa=buffer.getSamples(0);
// fa.noise();
filter->setLowPass(cutoff, resonance);
filter->process(fa, fa, fa.getSize());
buffer.getSamples(1).copyFrom(fa);
}
BiquadFilterTestPatch(){
registerParameter(PARAMETER_A, "Cutoff");
registerParameter(PARAMETER_B, "Resonance");
int stages=3;
filter=BiquadFilter::create(stages);
float cutoff=0.2;
float resonance=2;
//test setLowPass
FloatArray coefficients=FloatArray::create(5*stages);
FloatArray states=FloatArray::create(2*stages);
FilterStage stage(coefficients, states);
filter->setLowPass(cutoff, resonance);
stage.setLowPass(cutoff, resonance);
for(int k=0; k<stages; k++){
for(int n=0; n<5; n++){
float filterC=filter->getFilterStage(k).getCoefficients()[n];
float stageC=stage.getCoefficients()[n];
ASSERT(filterC==stageC, "Coefficients not initialized"); //check that filter coefficients are properly initialized
}
}
int signalLength=100;
FloatArray x=FloatArray::create(signalLength);
FloatArray x1=FloatArray::create(signalLength);
FloatArray y=FloatArray::create(signalLength);
FloatArray y1=FloatArray::create(signalLength);
x.noise();
x1.copyFrom(x);
filter->process(x1, y1, x1.getSize());
//manually compute the filter
float b0=filter->getFilterStage(0).getCoefficients()[0];
float b1=filter->getFilterStage(0).getCoefficients()[1];
float b2=filter->getFilterStage(0).getCoefficients()[2];
float a1=filter->getFilterStage(0).getCoefficients()[3];
float a2=filter->getFilterStage(0).getCoefficients()[4];
for(int n=0; n<stages; n++){
float d1=0;
float d2=0;
for(int n=0; n<x.getSize(); n++){ //manually apply filter, one stage
y[n] = b0 * x[n] + d1;
d1 = b1 * x[n] + a1 * y[n] + d2;
d2 = b2 * x[n] + a2 * y[n];
}
x.copyFrom(y); //copy the output to the input for the next iteration. INEFFICIENT
}
//done with the filter
for(int n=0; n<x.getSize(); n++){
// ASSERT(abs(y[n]-y1[n])<0.0001, "");//BiquadFilter.process(FloatArray, FloatArray) result"); //TODO: fails for non-arm
}
FloatArray::destroy(x);
FloatArray::destroy(x1);
FloatArray::destroy(y);
FloatArray::destroy(y1);
debugMessage("All tests passed");
}
DrumVoice(float sr) : fs(sr) {
// env = new AdsrEnvelope(sr);
// env = FloatArray::create(1024);
// for(int i=0; i<env.getSize(); ++i)
// env[i] = expf(-M_E*i/env.getSize());
snare = 0;
balance = 0.2;
sine = new SineOscillator(sr);
chirp = new ChirpOscillator(sr);
impulse = new ImpulseOscillator();
env1 = new ExponentialDecayEnvelope(sr);
env2 = new ExponentialDecayEnvelope(sr);
noise = new PinkNoiseOscillator();
filter = BiquadFilter::create(1);
filter->setLowPass(0.6, FilterStage::BUTTERWORTH_Q);
}
void setSnap(float s){
snare = s;
balance = s*0.5;
filter->setLowPass(0.25+balance, FilterStage::BUTTERWORTH_Q);
}