import jm.audio.AudioObject;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;
/**
* A basic additive synthesis instrument implementation
* which includes sine waves as overtones.
*
* @author Andrew Brown
*/
public final class OvertoneInst extends jm.audio.Instrument {
//----------------------------------------------
// Attributes
//----------------------------------------------
/**
* The number of channels
*/
private int channels;
/**
* the sample rate passed to the instrument
*/
private int sampleRate;
/**
* A constructor to set an initial
* sampling rate and number of channels.
*
* @param sampleRate
*/
public OvertoneInst(int sampleRate) {
this.sampleRate = sampleRate;
this.channels = 2;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build the objects that
* this instrument will use
*/
public void createChain() {
// fundamental
Oscillator osc0 = new Oscillator(this, Oscillator.SINE_WAVE,
this.sampleRate, this.channels);
Volume vol0 = new Volume(osc0, (float) 1.0);
// 1st harmonic
Oscillator osc1 = new Oscillator(this, Oscillator.SINE_WAVE,
this.sampleRate, this.channels);
osc1.setFrqRatio((float) 2.0);
Volume vol1 = new Volume(osc1, (float) 0.5);
// 2nd harmonic
Oscillator osc2 = new Oscillator(this, Oscillator.SINE_WAVE,
this.sampleRate, this.channels);
osc2.setFrqRatio((float) 3.0);
Volume vol2 = new Volume(osc2, (float) 0.25);
// 3nd harmonic
Oscillator osc3 = new Oscillator(this, Oscillator.SINE_WAVE,
this.sampleRate, this.channels);
osc3.setFrqRatio((float) 3.0);
Volume vol3 = new Volume(osc3, (float) 0.025);
// add them together
AudioObject[] overtones = {vol0, vol1, vol2, vol3};
Add adder = new Add(overtones);
Envelope env = new Envelope(adder, new double[]{0.0, 0.0, 0.1,
1.0, 1.0, 0.0});
StereoPan span = new StereoPan(env);
SampleOut sout = new SampleOut(span);
}
}