import jm.audio.AudioObject;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;
/**
* An amplitude modulation synthesis instrument
* which uses a noise modulation source
*
* @author Andrew Brown
*/
public final class AMNoiseInst 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;
/**
* the amount of noise modulation (0 - 1)
*/
private float depth = (float) 0.0;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate.
*
* @param sampleRate
* @param depth
*/
public AMNoiseInst(int sampleRate, double depth) {
this.sampleRate = sampleRate;
this.channels = 1;
this.depth = (float) depth;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build the objects that
* this instrument will use.
*/
public void createChain() {
// modulator
Noise noise = new Noise(this, Noise.FRACTAL_NOISE, this.sampleRate, this.channels);
Envelope modEnv = new Envelope(noise,
new double[]{0.0, 0.0, 0.5, 1.0, 1.0, 1.0});
Volume modVol = new Volume(modEnv, (float) this.depth); // respond to note dynamic
// constant
Value offsetAmp = new Value(this, this.sampleRate, this.channels, (float) 0.5);
AudioObject[] grp1 = {modVol, offsetAmp};
Add add = new Add(grp1);
// carrier
Oscillator carrier = new Oscillator(add,
Oscillator.SINE_WAVE, WaveTable.AMPLITUDE);
Envelope env = new Envelope(carrier,
new double[]{0.0, 0.0, 0.5, 1.0, 1.0, 0.0});
Volume vol = new Volume(env, (float) 1.0);
StereoPan span = new StereoPan(vol);
SampleOut sout = new SampleOut(span);
}
}