Re: How to generate sound of given frequency?

Gonzo wrote:


package com.knutejohnson.classes;

import java.util.*;
import javax.sound.sampled.*;

public class Tone {
     public static float SAMPLE_RATE = 8000f;

     public static void sound(int hz, int msecs, double vol)
      throws LineUnavailableException {

         if (hz <= 0)
             throw new IllegalArgumentException("Frequency <= 0 hz");

         if (msecs <= 0)
             throw new IllegalArgumentException("Duration <= 0 msecs");

         if (vol > 1.0 || vol < 0.0)
             throw new IllegalArgumentException("Volume out of range 0.0
- 1.0");

         byte[] buf = new byte[(int)SAMPLE_RATE * msecs / 1000];

         for (int i=0; i<buf.length; i++) {
             double angle = i / (SAMPLE_RATE / hz) * 2.0 * Math.PI;
             buf[i] = (byte)(Math.sin(angle) * 127.0 * vol);
         }

         // shape the front and back 10ms of the wave form
         for (int i=0; i < SAMPLE_RATE / 100.0 && i < buf.length / 2; i++) {
             buf[i] = (byte)(buf[i] * i / (SAMPLE_RATE / 100.0));
             buf[buf.length-1-i] =
              (byte)(buf[buf.length-1-i] * i / (SAMPLE_RATE / 100.0));
         }

         AudioFormat af = new AudioFormat(SAMPLE_RATE,8,1,true,false);
         SourceDataLine sdl = AudioSystem.getSourceDataLine(af);
         sdl.open(af);
         sdl.start();
         sdl.write(buf,0,buf.length);
         sdl.drain();
         sdl.close();
     }

     public static void main(String[] args) throws
LineUnavailableException {
         Tone.sound(800,1000,0.8);
     }
}

--

Knute Johnson
email s/nospam/knute2009/

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