//==========================================================
// File: FractalInst.java
// Package: inst
// Function: Implementation of a fractal noise generator
// Author: Andrew Brown
// Environment: JDK1.1
//==========================================================
import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;
/**
* A basic fractal noise synthesis instrument implementation
* which implements envelope, pan, and volume control
*
* @author Andrew Brown
*/
public class FractalInst extends Instrument {
//----------------------------------------------
// Attributes
//----------------------------------------------
/**
* The points to use in the construction of Envelopes
*/
private EnvPoint[] pointArray = new EnvPoint[10];
private int channels;
private int sampleRate;
private int resolution;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate.
*
* @param sampleRate
*/
public FractalInst(int sampleRate) {
this(sampleRate, 1);
}
/**
* A second constructor to set an initial
* sampling rate and number of channels.
*
* @param sampleRate
* @param channels (i.e., 1 = mono, 2 = stereo)
*/
public FractalInst(int sampleRate, int channels) {
this(sampleRate, channels, 1);
}
/**
* A second constructor to set an initial
* sampling rate and number of channels.
*
* @param sampleRate
* @param channels (i.e., 1 = mono, 2 = stereo)
* @param resolution the graininess of the fractal curve
*/
public FractalInst(int sampleRate, int channels, int res) {
this.sampleRate = sampleRate;
this.channels = channels;
this.resolution = res;
EnvPoint[] tempArray = {
new EnvPoint((float) 0.0, (float) 0.0),
new EnvPoint((float) 0.05, (float) 1.0),
new EnvPoint((float) 0.15, (float) 0.4),
new EnvPoint((float) 0.9, (float) 0.3),
new EnvPoint((float) 1.0, (float) 0.0)
};
pointArray = tempArray;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build a chain of the objects that
* this instrument will use.
*/
public void createChain() {
Noise noise = new Noise(this, Noise.FRACTAL_NOISE, this.sampleRate);
Envelope env = new Envelope(noise, pointArray);
Volume vol = new Volume(env, (float) 1.0);
StereoPan span = new StereoPan(vol);
SampleOut sout = new SampleOut(span);
}
}