PlayPartials.java

package com.jsyn.examples;

import com.jsyn.JSyn;
import com.jsyn.Synthesizer;
import com.jsyn.unitgen.LineOut;
import com.jsyn.unitgen.LinearRamp;
import com.jsyn.unitgen.Multiply;
import com.jsyn.unitgen.SineOscillator;
import com.jsyn.unitgen.UnitOscillator;

/**
 * Play a enharmonic sine tones using JSyn oscillators.
 * 
 * @author Phil Burk (C) 2010 Mobileer Inc
 * 
 */
public class PlayPartials
{
	private Synthesizer synth;
	private UnitOscillator[] osc;
	private Multiply[] multipliers;
	private LinearRamp ramp;
	private LineOut lineOut;
	private double[] amps = { 0.2, 0.1, 0.3, 0.4 };
	private double[] ratios = { 1.0, Math.sqrt( 2.0 ), Math.E, Math.PI };

	private void test()
	{
		// Create a context for the synthesizer.
		synth = JSyn.createSynthesizer();

		// Start synthesizer using default stereo output at 44100 Hz.
		synth.start();

		// Add a stereo audio output unit.
		synth.add( lineOut = new LineOut() );
		synth.add( ramp = new LinearRamp() );

		// Add a tone generator.
		osc = new SineOscillator[amps.length];
		multipliers = new Multiply[ratios.length];
		
		
		for( int i = 0; i < osc.length; i++ )
		{
			// Create unit generators and store them in arrays.
			synth.add( osc[i] = new SineOscillator() );
			synth.add( multipliers[i] = new Multiply() );
			
			// Connect each oscillator to both channels of the output.
			// They will be mixed automatically.
			osc[i].output.connect( 0, lineOut.input, 0 );
			osc[i].output.connect( 0, lineOut.input, 1 );

			// Use a multiplier to scale the output of the ramp.
			// output = inputA * inputB
			ramp.output.connect( multipliers[i].inputA );
			multipliers[i].output.connect( osc[i].frequency );
			multipliers[i].inputB.set( ratios[i] );
			
			osc[i].amplitude.set( amps[i] );
		}

		// start ramping up
		ramp.current.set( 100.0);
		ramp.time.set(3.0);
		ramp.input.set( 700.0 );
		
		// We only need to start the LineOut. It will pull data from the
		// oscillator.
		lineOut.start();

		System.out.println( "You should now be hearing a sine wave. ---------" );

		// Sleep while the sound is generated in the background.
		try
		{
			// Sleep for a few seconds.
			synth.sleepFor( 4.0 );
			// ramp down
			ramp.input.set( 100.0 );
			synth.sleepFor( 4.0 );
		} catch( InterruptedException e )
		{
			e.printStackTrace();
		}

		System.out.println( "Stop playing. -------------------" );
		// Stop everything.
		synth.stop();
	}

	public static void main( String[] args )
	{
		System.out.println("Java version = " + System.getProperty( "java.version" ));
		new PlayPartials().test();
	}
}