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
* It has an envelope in reverse shape to normal.
*
* @author Andrew Brown and Andrew Sorensen
*/
public final class SquareBackwardsInst extends Instrument {
//----------------------------------------------
// Attributes
//----------------------------------------------
/**
* The points to use in the construction of Envelopes
*/
private EnvPoint[] pointArray = new EnvPoint[10];
private int sampleRate;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate and buffersize in addition
* to the neccessary frequency relationships
* and volumes for each frequency to be added
* the instrument
*
* @param sampleRate
* @param buffersize
* @param frequencies the relative freqencies to use
* @param volumes the volumes to use for the frequencies
*/
public SquareBackwardsInst(int sampleRate) {
this.sampleRate = sampleRate;
EnvPoint[] tempArray = {
new EnvPoint((float) 0.0, (float) 0.0),
new EnvPoint((float) 0.05, (float) 0.2),
new EnvPoint((float) 0.85, (float) 0.6),
new EnvPoint((float) 0.98, (float) 1.0),
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);
Envelope env = new Envelope(wt, pointArray);
Volume vol = new Volume(env);
StereoPan span = new StereoPan(vol);
SampleOut sout = new SampleOut(span);
}
}