package vafusion.inst;
import jm.audio.Instrument;
import jm.audio.io.*;
import jm.audio.synth.*;
import jm.music.data.Note;
import jm.audio.AudioObject;
/**
* A triangle waveform instrument implementation
* which iincludes a low pass filter that is swept by
* an envelope.
* @author Andrew Brown
*/
public final class LPFilterEnvInst extends Instrument{
//----------------------------------------------
// Attributes
//----------------------------------------------
private int sampleRate;
private int filterCutoff;
private int channels;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor
* @param sampleRate
*/
public LPFilterEnvInst(int sampleRate){
this(sampleRate, (int)(sampleRate * 0.02), 1);
}
/**
* Constructor that sets sample rate and filter cutoff centre frequency
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
*/
public LPFilterEnvInst(int sampleRate, int filterCutoff){
this(sampleRate, filterCutoff, 1);
}
/**
* Constructor that sets all attributes
* @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 LPFilterEnvInst(int sampleRate, int filterCutoff, int channels){
this.sampleRate = sampleRate;
this.filterCutoff = filterCutoff;
this.channels = channels;
}
/**
* Initialisation method used to build the objects that
* this instrument will use and specify thier interconnections.
*/
@Override
public void createChain(){
// filter envelope
Envelope filtEnv = new Envelope(this, this.sampleRate, this.channels,
new double[] {0.0, 0.0, 0.2, (this.sampleRate * 0.4), 0.4, 0.0, 0.6, (this.sampleRate * 0.3), 1.0,
(this.filterCutoff * 0.1)});
// oscilator
Oscillator osc = new Oscillator(this, Oscillator.TRIANGLE_WAVE, this.sampleRate, this.channels);
// filter
Filter filt = new Filter(new AudioObject[] {osc, filtEnv}, this.filterCutoff, Filter.LOW_PASS);
Envelope env = new Envelope(filt,
new double[] {0.0, 0.0, 0.05, 1.0, 1.0, 0.0});
Volume vol = new Volume(env);
StereoPan pan = new StereoPan(vol);
SampleOut sout = new SampleOut(pan);
}
}