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import jm.audio.Instrument;
import jm.audio.io.*;
import jm.audio.synth.*;
import jm.music.data.Note;
import jm.audio.AudioObject;
/**
* 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{
private int sampleRate;
private int filterCutoff;
private int channels;
/**
* 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;
}
/**
* 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, 1, (float)0.5);
Oscillator sineMod = new Oscillator(modfreq, Oscillator.COSINE_WAVE,
Oscillator.FREQUENCY);
sineMod.setAmp((float) 2000.0);
Oscillator wt = new Oscillator(this, Oscillator.SAWTOOTH_WAVE,
this.sampleRate, this.channels);
Filter filt = new Filter(new AudioObject[] {wt, sineMod},
this.filterCutoff, Filter.LOW_PASS);
// filter mod source 2
Value modfreq2 = new Value(this, this.sampleRate, 1, (float)0.5);
Oscillator sineMod2 = new Oscillator(modfreq2, Oscillator.COSINE_WAVE,
Oscillator.FREQUENCY);
sineMod2.setAmp((float) 2000.0);
Filter filt2 = new Filter(new AudioObject[] {filt, sineMod2},
this.filterCutoff, Filter.HIGH_PASS);
Volume vol2 = new Volume(filt2, (float)10.0); // amount of resonance
// filter mod source 3
Value modfreq3 = new Value(this, this.sampleRate, 1, (float)0.5);
Oscillator sineMod3 = new Oscillator(modfreq3, Oscillator.COSINE_WAVE,
Oscillator.FREQUENCY);
sineMod3.setAmp((float) 2000.0);
Oscillator wt3 = new Oscillator(this, Oscillator.SAWTOOTH_WAVE,
this.sampleRate, this.channels);
Filter filt3 = new Filter(new AudioObject[] {wt3, sineMod3},
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);
}
}
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More details to come.
Composition Example
More details to come.
import jm.music.data.*;
import jm.music.tools.*;
import jm.JMC;
import jm.audio.*;
import jm.util.*;
public class TextureLoops implements JMC {
public static void main(String[] args) {
new TextureLoops();
}
public TextureLoops() {
Part part = new Part();
Score score = new Score(part);
// increase the texture over time
for(int i = 0; i < 5; i++) {
double currStageET = score.getEndTime();
for (int j = 0; j < i+1; j++) {
part.addPhrase(OnePhrase(currStageET, i));
}
}
// decrease the texture again
for(int i = 4; i >= 0; i--) {
double currStageET = score.getEndTime();
for (int j = 0; j < i+1; j++) {
part.addPhrase(OnePhrase(currStageET, i));
}
}
// add accents
Mod.accents(score, 2.0, new double[] {0.0}, 40);
// see the score
View.show(score);
// render as an audio file
Instrument inst = new ResSawInst(11000);
Write.au(score, "TextureLoops.au", inst);
}
private Phrase OnePhrase(double startTime, int densityFactor) {
double currentST = startTime - (int)(Math.random() * 12) * 0.25;
if (currentST < 0.0) currentST = 0.0;
Phrase phrase = new Phrase(currentST);
double panPos = Math.random();
// get a pitch
int pitch = C4 + (int)(Math.random() * 12 * densityFactor - 6 *
densityFactor);
Note n = new Note(pitch, 1.0);
while (!n.isScale(PENTATONIC_SCALE)) {
n = new Note(pitch, 1.0);
pitch = C2 + (int)(Math.random() * 36);
}
for(int i =0; i < 24 ; i++) {
Note note = new Note(pitch,
DEMI_SEMI_QUAVER * (int)(Math.random() *
(1.5 * densityFactor) + 1),
(int)(Math.random() * 80) + 47);
note.setPan(panPos);
phrase.addNote(note);
}
return phrase;
}
}
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© 2001 Andrew Brown |
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