art.jmusic.1.6.4.1.source-code.ResSawInst Maven / Gradle / Ivy

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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);
    }
}