# Re: How to generate sound of given frequency?

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.help
Date:
Fri, 13 Mar 2009 11:39:24 -0700
Message-ID:
<49baa85b\$0\$25637\$b9f67a60@news.newsdemon.com>
Gonzo wrote:

I'm looking for something as simple as possible.

Thanks,
G

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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