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/*
* Copyright 2010 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.instruments;
import com.jsyn.ports.UnitInputPort;
import com.jsyn.ports.UnitOutputPort;
import com.jsyn.unitgen.Add;
import com.jsyn.unitgen.Circuit;
import com.jsyn.unitgen.EnvelopeDAHDSR;
import com.jsyn.unitgen.FilterLowPass;
import com.jsyn.unitgen.Multiply;
import com.jsyn.unitgen.SawtoothOscillatorBL;
import com.jsyn.unitgen.UnitOscillator;
import com.jsyn.unitgen.UnitVoice;
import com.jsyn.util.VoiceDescription;
import com.softsynth.shared.time.TimeStamp;
/**
* Typical synthesizer voice with one oscillator and a biquad resonant filter. Modulate the amplitude and
* filter using DAHDSR envelopes.
*
* @author Phil Burk (C) 2010 Mobileer Inc
*/
public class SubtractiveSynthVoice extends Circuit implements UnitVoice {
private UnitOscillator osc;
private FilterLowPass filter;
private EnvelopeDAHDSR ampEnv;
private EnvelopeDAHDSR filterEnv;
private Add cutoffAdder;
private Multiply frequencyScaler;
public UnitInputPort amplitude;
public UnitInputPort frequency;
/**
* This scales the frequency value. You can use this to modulate a group of instruments using a
* shared LFO and they will stay in tune.
*/
public UnitInputPort pitchModulation;
public UnitInputPort cutoff;
public UnitInputPort cutoffRange;
public UnitInputPort Q;
public SubtractiveSynthVoice() {
add(frequencyScaler = new Multiply());
// Add a tone generator.
add(osc = new SawtoothOscillatorBL());
// Use an envelope to control the amplitude.
add(ampEnv = new EnvelopeDAHDSR());
// Use an envelope to control the filter cutoff.
add(filterEnv = new EnvelopeDAHDSR());
add(filter = new FilterLowPass());
add(cutoffAdder = new Add());
filterEnv.output.connect(cutoffAdder.inputA);
cutoffAdder.output.connect(filter.frequency);
frequencyScaler.output.connect(osc.frequency);
osc.output.connect(filter.input);
filter.output.connect(ampEnv.amplitude);
addPort(amplitude = osc.amplitude, "Amplitude");
addPort(frequency = frequencyScaler.inputA, "Frequency");
addPort(pitchModulation = frequencyScaler.inputB, "PitchMod");
addPort(cutoff = cutoffAdder.inputB, "Cutoff");
addPort(cutoffRange = filterEnv.amplitude, "CutoffRange");
addPort(Q = filter.Q);
ampEnv.export(this, "Amp");
filterEnv.export(this, "Filter");
frequency.setup(osc.frequency);
pitchModulation.setup(0.2, 1.0, 4.0);
cutoff.setup(filter.frequency);
cutoffRange.setup(filter.frequency);
// Make the circuit turn off when the envelope finishes to reduce CPU load.
ampEnv.setupAutoDisable(this);
usePreset(0);
}
@Override
public void noteOff(TimeStamp timeStamp) {
ampEnv.input.off(timeStamp);
filterEnv.input.off(timeStamp);
}
@Override
public void noteOn(double freq, double ampl, TimeStamp timeStamp) {
frequency.set(freq, timeStamp);
amplitude.set(ampl, timeStamp);
ampEnv.input.on(timeStamp);
filterEnv.input.on(timeStamp);
}
@Override
public UnitOutputPort getOutput() {
return ampEnv.output;
}
@Override
public void usePreset(int presetIndex) {
int n = presetIndex % presetNames.length;
switch (n) {
case 0:
ampEnv.attack.set(0.01);
ampEnv.decay.set(0.2);
ampEnv.release.set(1.0);
cutoff.set(500.0);
cutoffRange.set(500.0);
filter.Q.set(1.0);
break;
case 1:
ampEnv.attack.set(0.5);
ampEnv.decay.set(0.3);
ampEnv.release.set(0.2);
cutoff.set(500.0);
cutoffRange.set(500.0);
filter.Q.set(3.0);
break;
case 2:
default:
ampEnv.attack.set(0.1);
ampEnv.decay.set(0.3);
ampEnv.release.set(0.5);
cutoff.set(2000.0);
cutoffRange.set(500.0);
filter.Q.set(2.0);
break;
}
}
static String[] presetNames = {
"FastSaw", "SlowSaw", "BrightSaw"
};
static class MyVoiceDescription extends VoiceDescription {
String[] tags = {
"electronic", "filter", "clean"
};
public MyVoiceDescription() {
super("SubtractiveSynth", presetNames);
}
@Override
public UnitVoice createUnitVoice() {
return new SubtractiveSynthVoice();
}
@Override
public String[] getTags(int presetIndex) {
return tags;
}
@Override
public String getVoiceClassName() {
return SubtractiveSynthVoice.class.getName();
}
}
public static VoiceDescription getVoiceDescription() {
return new MyVoiceDescription();
}
}
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