import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;
/**
* A basic square wave instrument implementation
* which implements envelope , pan, and volume control
*
* @author Andrew Brown and Andrew Sorensen
*/
public final class SquareLPFInst extends Instrument {
//----------------------------------------------
// Attributes
//----------------------------------------------
/**
* The points to use in the construction of Envelopes
*/
private EnvPoint[] pointArray = new EnvPoint[10];
private int sampleRate;
private int cutoff;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate.
*
* @param sampleRate
*/
public SquareLPFInst(int sampleRate) {
this(sampleRate, 500);
}
/**
* Basic default constructor to set an initial
* sampling rate.
*
* @param sampleRate
* @param cuttoff Filter cuttoff frequency in hertz
*/
public SquareLPFInst(int sampleRate, int cutoff) {
this.sampleRate = sampleRate;
this.cutoff = cutoff;
EnvPoint[] tempArray = {
new EnvPoint((float) 0.0, (float) 0.0),
new EnvPoint((float) 0.02, (float) 1.0),
new EnvPoint((float) 0.15, (float) 0.6),
new EnvPoint((float) 0.95, (float) 0.4),
new EnvPoint((float) 1.0, (float) 0.0)
};
pointArray = tempArray;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build the objects that
* this instrument will use
*/
public void createChain() {
Oscillator wt = new Oscillator(this, Oscillator.SQUARE_WAVE,
this.sampleRate, 2);
Filter filt = new Filter(wt, cutoff, Filter.LOW_PASS);
Envelope env = new Envelope(filt, pointArray);
Volume vol = new Volume(env);
StereoPan span = new StereoPan(vol);
SampleOut sout = new SampleOut(span);
}
}