Sine Wave Sound Generator in Java

Question

What\'s the simplest way to generate a sine wave sound at any frequency in Java? A sample size more than 2 bytes would help, but it doesn\'t really matter.

Answer 1

If you want some easy code to get you started, this should help

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;

public class SinSynth {
    //
   protected static final int SAMPLE_RATE = 16 * 1024;


   public static byte[] createSinWaveBuffer(double freq, int ms) {
       int samples = (int)((ms * SAMPLE_RATE) / 1000);
       byte[] output = new byte[samples];
           //
       double period = (double)SAMPLE_RATE / freq;
       for (int i = 0; i < output.length; i++) {
           double angle = 2.0 * Math.PI * i / period;
           output[i] = (byte)(Math.sin(angle) * 127f);  }

       return output;
   }



   public static void main(String[] args) throws LineUnavailableException {
       final AudioFormat af = new AudioFormat(SAMPLE_RATE, 8, 1, true, true);
       SourceDataLine line = AudioSystem.getSourceDataLine(af);
       line.open(af, SAMPLE_RATE);
       line.start();

       boolean forwardNotBack = true;

       for(double freq = 400; freq <= 800;)  {
           byte [] toneBuffer = createSinWaveBuffer(freq, 50);
           int count = line.write(toneBuffer, 0, toneBuffer.length);

           if(forwardNotBack)  {
               freq += 20;  
               forwardNotBack = false;  }
           else  {
               freq -= 10;
               forwardNotBack = true;  
       }   }

       line.drain();
       line.close();
    }

}