import javax.sound.sampled.*;

/**  http://mindprod.com/jgloss/sound.html
 * Generate a tone mathematically.
 *
 * @author Knute Johnson
 */
// PYL Octobre 05 
 
class tson
   {
   /**
   * Generate a tone
   */
   static double frequence;
   static double seconde;
   
   
   public static void joue ()
      {
      double seconds = 0.25;
      int sampleRate = 8000;//////
      double frequency;// = 440.0;
      double RAD = 2.0 * Math.PI;
	  frequency=frequence/2;
	  System.out.println("frequence="+frequence);
      try
         {
         AudioFormat af = new
                          AudioFormat( (float)sampleRate, 8, 1, true, true );
         DataLine.Info info = new
                              DataLine.Info ( SourceDataLine.class, af );
         SourceDataLine source =
         (SourceDataLine) AudioSystem.getLine( info );
         source.open( af );
         source.start();
         byte[] buf = new byte[(int)(sampleRate * seconds)];
         for ( int i=0; i<buf.length; i++ )
            {
            buf[i] =
            (byte)( Math.sin( RAD * frequency / sampleRate * i ) * 127.0
            *Math.sin( RAD * frequency / sampleRate * i )  );
            }
         source.write( buf, 0, buf.length );
         source.drain();
         source.stop();
         source.close();
         }
      catch ( Exception e )
         {
         System.out.println( e );
         }
     
      }
   }