art.jmusic.1.6.4.1.source-code.SawLPFInstG 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
 * an envelope and uses the multiply object to scale
 * the filter envelope depth. A second oscillator is added
 * and detuned slightly to give a fat chorused effect.
 *
 * @author Andrew Brown
 */

public final class SawLPFInstG extends Instrument {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------
    private int sampleRate;
    private int filterCutoff;
    private int channels;

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

    /**
     * Basic default constructor to set an initial
     * sampling rate and buffersize in addition
     * to the neccessary frequency relationships
     * and volumes for each frequency to be added
     * the instrument
     *
     * @param sampleRate
     */
    public SawLPFInstG(int sampleRate) {
        this(sampleRate, 1000, 1);
    }

    /**
     * Constructor that sets sample rate and the number of channels
     *
     * @param sampleRate   The number of samples per second (quality)
     * @param filterCutoff The frequency above which overtones are cut
     */
    public SawLPFInstG(int sampleRate, int filterCutoff) {
        this(sampleRate, filterCutoff, 1);
    }

    /**
     * Constructor that sets sample rate and the number of 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 SawLPFInstG(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() {
        // modulating LFO
        Value freq = new Value(this, this.sampleRate, this.channels, (float) 6.0);
        Oscillator LFO = new Oscillator(freq, Oscillator.SINE_WAVE, Oscillator.FREQUENCY);
        LFO.setAmp((float) 3.0);
        Envelope LFOenv = new Envelope(LFO,
                new double[]{0.0, 0.0, 0.2, 0.4, 0.4, 1.0, 0.8, 1.0, 1.0, 0.0});
        // constant
        Value offsetFrequency = new Value(this, this.sampleRate, this.channels, Value.NOTE_PITCH);
        AudioObject[] grp1 = {LFOenv, offsetFrequency};
        Add add = new Add(grp1);
        // Filter cutoff envelope control
        Envelope filtEnv = new Envelope(this, this.sampleRate, this.channels,
                new double[]{0.0, 0.0, 0.5, 1.0, 1.0, 0.0});
        Value scalefactor = new Value(this, this.sampleRate, this.channels, (float) 2000.0);
        Multiply mult = new Multiply(new AudioObject[]{filtEnv, scalefactor});
        // Waveform 1
        Oscillator wave = new Oscillator(add, Oscillator.SAWTOOTH_WAVE, Oscillator.FREQUENCY);
        // Filter
        Filter filt = new Filter(new AudioObject[]{wave, mult}, this.filterCutoff, Filter.LOW_PASS);
        // Envelope gnerator
        Envelope env = new Envelope(filt,
                new double[]{0.0, 0.0, 0.05, 1.0, 0.2, 0.4, 0.8, 0.3, 1.0, 0.0});
        // respond to note dynamics
        Volume vol = new Volume(env);
        // save to a file
        SampleOut sout = new SampleOut(vol);
    }
}