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

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import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;

/**
 * A basic square wave instrument implementation
 * which implements envelope , pan, and volume control
 *
 * @author Andrew Brown and Andrew Sorensen
 */

public final class SquareLPFInst extends Instrument {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------

    /**
     * The points to use in the construction of Envelopes
     */
    private EnvPoint[] pointArray = new EnvPoint[10];

    private int sampleRate;
    private int cutoff;

    //----------------------------------------------
    // Constructor
    //----------------------------------------------

    /**
     * Basic default constructor to set an initial
     * sampling rate.
     *
     * @param sampleRate
     */
    public SquareLPFInst(int sampleRate) {
        this(sampleRate, 500);
    }

    /**
     * Basic default constructor to set an initial
     * sampling rate.
     *
     * @param sampleRate
     * @param cuttoff    Filter cuttoff frequency in hertz
     */
    public SquareLPFInst(int sampleRate, int cutoff) {
        this.sampleRate = sampleRate;
        this.cutoff = cutoff;
        EnvPoint[] tempArray = {
                new EnvPoint((float) 0.0, (float) 0.0),
                new EnvPoint((float) 0.02, (float) 1.0),
                new EnvPoint((float) 0.15, (float) 0.6),
                new EnvPoint((float) 0.95, (float) 0.4),
                new EnvPoint((float) 1.0, (float) 0.0)
        };
        pointArray = tempArray;
    }

    //----------------------------------------------
    // Methods
    //----------------------------------------------

    /**
     * Initialisation method used to build the objects that
     * this instrument will use
     */
    public void createChain() {
        Oscillator wt = new Oscillator(this, Oscillator.SQUARE_WAVE,
                this.sampleRate, 2);
        Filter filt = new Filter(wt, cutoff, Filter.LOW_PASS);
        Envelope env = new Envelope(filt, pointArray);
        Volume vol = new Volume(env);
        StereoPan span = new StereoPan(vol);
        SampleOut sout = new SampleOut(span);
    }
}