import jm.audio.AudioObject;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;
/**
* A basic amplitude modulation synthesis instrument
* which implements envelope and volume control
*
* @author Andrew Brown
*/
public class AMInst extends jm.audio.Instrument {
//----------------------------------------------
// Attributes
//----------------------------------------------
/**
* the sample rate passed to the instrument
*/
private int sampleRate;
/**
* the sample rate passed to the instrument
*/
private int channels;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate.
*
* @param sampleRate
*/
public AMInst(int sampleRate) {
this.sampleRate = sampleRate;
this.channels = 1;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build the objects that
* this instrument will use.
*/
public void createChain() {
Oscillator mod = new Oscillator(this, Oscillator.SINE_WAVE,
this.sampleRate, this.channels);
mod.setFrqRatio((float) 7.5);
Envelope env = new Envelope(mod,
new double[]{0.0, 0.0, 0.4, 1.0, 1.0, 0.8});
Value offsetAmp = new Value(this, this.sampleRate,
this.channels, (float) 0.7);
Add add = new Add(new AudioObject[]{env, offsetAmp});
Oscillator carr = new Oscillator(add,
Oscillator.SINE_WAVE, WaveTable.AMPLITUDE);
Envelope env2 = new Envelope(carr,
new double[]{0.0, 0.0, 0.5, 1.0, 1.0, 0.0});
SampleOut sout = new SampleOut(env2);
}
}