import jm.audio.AudioObject;
import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;
/**
* A sawtooth waveform instrument implementation
* which iincludes a low pass filter that is swept by
* a three filters - two forming a band pass anf
* one as the low pass.
*
* @author Andrew Brown
*/
public final class ResSawInst extends Instrument {
//----------------------------------------------
// Attributes
//----------------------------------------------
private int sampleRate;
private int filterCutoff;
private int channels;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate
*
* @param sampleRate
*/
public ResSawInst(int sampleRate) {
this(sampleRate, 2500, 1);
}
/**
* Constructor that sets sample rate and filter cutoff
*
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
*/
public ResSawInst(int sampleRate, int filterCutoff) {
this(sampleRate, filterCutoff, 1);
}
/**
* Constructor that sets sample rate , cutoff and channels
*
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
* @param channels 1 for Mono or 2 for Stereo
*/
public ResSawInst(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() {
// filter mod source 1
Value modfreq = new Value(this, this.sampleRate, this.channels, (float) 0.5);
Oscillator sineMod = new Oscillator(modfreq, Oscillator.COSINE_WAVE, Oscillator.FREQUENCY);
Splitter lfo = new Splitter(sineMod);
sineMod.setAmp((float) 2000.0);
Oscillator wt = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
Filter filt = new Filter(new AudioObject[]{wt, lfo}, this.filterCutoff, Filter.LOW_PASS);
// filter mod source 2
Filter filt2 = new Filter(new AudioObject[]{filt, lfo}, this.filterCutoff, Filter.HIGH_PASS);
Volume vol2 = new Volume(filt2, (float) 10.0); // amount of resonance
// filter mod source 3
Oscillator wt3 = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
Filter filt3 = new Filter(new AudioObject[]{wt3, lfo}, this.filterCutoff, Filter.LOW_PASS);
Volume vol3 = new Volume(filt3);
// add and pocess everythning
Add add = new Add(new AudioObject[]{vol2, vol3});
Envelope env = new Envelope(add,
new double[]{0.0, 0.0, 0.05, 1.0, 0.2, 0.4, 0.8, 0.3, 1.0, 0.0});
StereoPan span = new StereoPan(env);
SampleOut sout = new SampleOut(span);
}
}