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 squarewave instrument implementation which includes
* a low pass filter that is swept by a cosine wave.
* @author Andrew Brown
*/
public final class LFOFilteredSquareInst extends Instrument{
//----------------------------------------------
// Attributes
//----------------------------------------------
private int sampleRate;
private int filterCutoff;
private int channels;
private int modAmount;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial sampling rate
* @param sampleRate Integer in Hertz
*/
public LFOFilteredSquareInst(int sampleRate){
this(sampleRate, (int)(sampleRate * 0.2));
}
/**
* Constructor that sets sample rate and filter cutoff frequency
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency in hertz above which overtones are cut
*/
public LFOFilteredSquareInst(int sampleRate, int filterCutoff){
this(sampleRate, filterCutoff, (int)(filterCutoff * 0.9));
}
/**
* Constructor that sets sample rate, filter cutoff, and modulation amount
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
* @param modAmount The filter devation above and below the cutoff
*/
public LFOFilteredSquareInst(int sampleRate, int filterCutoff, int modAmount){
this(sampleRate, filterCutoff, modAmount, 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 modAmount The filter devation above and below the cutoff
* @param channels 1 for Mono or 2 for Stereo
*/
public LFOFilteredSquareInst(int sampleRate, int filterCutoff, int modAmount, int channels){
this.sampleRate = sampleRate;
this.filterCutoff = filterCutoff;
this.modAmount = modAmount;
this.channels = channels;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build the objects that
* this instrument will use and specify thier interconnections.
*/
@Override
public void createChain(){
// oscilators
Oscillator osc = new Oscillator(this, Oscillator.SQUARE_WAVE, this.sampleRate, this.channels);
Oscillator osc2 = new Oscillator(this, Oscillator.SQUARE_WAVE, this.sampleRate, this.channels);
osc2.setFrqRatio((float)1.001);
Oscillator osc3 = new Oscillator(this, Oscillator.SQUARE_WAVE, this.sampleRate, this.channels);
osc3.setFrqRatio((float)0.999);
Add add = new Add(new AudioObject[] {osc, osc2, osc3});
// filter mod
Value modfreq = new Value(this, this.sampleRate, this.channels, (float)0.3);
Oscillator sineMod = new Oscillator(modfreq, Oscillator.COSINE_WAVE, Oscillator.FREQUENCY);
sineMod.setAmp(this.modAmount);
// Filter - try changing this to a high pass filter
Filter filt = new Filter(new AudioObject[] {add, sineMod}, this.filterCutoff, Filter.LOW_PASS);
Envelope env = new Envelope(filt,
new double[] {0.0, 0.0, 0.05, 1.0, 0.2, 0.3, 0.8, 0.2, 1.0, 0.0});
Volume vol = new Volume(env);
SampleOut sout = new SampleOut(vol);
}
}