import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;
/**
* A monophonic sawtooth waveform instrument implementation
* which includes a static low pass filter.
*
* @author Andrew Brown
*/
public class SawLPFInst extends Instrument {
//----------------------------------------------
// Attributes
//----------------------------------------------
private int sampleRate;
private int filterCutoff;
private int channels;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate and use a default cutoff.
*
* @param sampleRate
*/
public SawLPFInst(int sampleRate) {
this(sampleRate, 1000);
}
/**
* Constructor that sets sample rate and the filter cutoff frequency.
*
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
*/
public SawLPFInst(int sampleRate, int filterCutoff) {
this.sampleRate = sampleRate;
this.filterCutoff = filterCutoff;
this.channels = 1;
}
/**
* Constructor that sets sample rate and the filter cutoff frequency.
*
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
* @param channels The numbers of channels, 1 = mono, 2 = stereo
*/
public SawLPFInst(int sampleRate, int filterCutoff, int channels) {
this.sampleRate = sampleRate;
this.filterCutoff = filterCutoff;
this.channels = channels;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build the objects that
* this instrument will use and specify thier interconnections.
*/
public void createChain() {
Oscillator osc = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
Filter filt = new Filter(osc, this.filterCutoff, Filter.LOW_PASS);
//Envelope env = new Envelope(filt,
//new double[] {0.0, 0.0, 0.1, 1.0, 0.2, 0.6, 0.8, 0.4, 1.0, 0.0});
ADSR env = new ADSR(filt, 20, 100, 0.6, 400);
Volume vol = new Volume(env);
StereoPan span = new StereoPan(vol);
SampleOut sout = new SampleOut(span);
}
}