public static void convert(InputStream in, OutputStream out) throws IOException, UnsupportedAudioFileException
	{

		// get an AudioInputStream of the desired format for playback
		AudioFormat.Encoding encoding = AudioFormat.Encoding.PCM_SIGNED;
		float rate = 8000f;
		int targetSampleSize = 16;
		boolean bigEndian = true;
		int channels = 1;
//		AudioFormat sourceFormat = new AudioFormat(encoding, rate, sourceSampleSize, channels, (sourceSampleSize / 8)
//				* channels, rate, bigEndian);
		AudioFormat targetFormat = new AudioFormat(encoding, rate, targetSampleSize, channels, (targetSampleSize / 8)
				* channels, rate, bigEndian);

		AudioInputStream lowResAIS = AudioSystem.getAudioInputStream(in); 
		AudioFormat sourceFormat = lowResAIS.getFormat();
		if (AudioSystem.isConversionSupported(targetFormat, sourceFormat))
		{
			lowResAIS = AudioSystem.getAudioInputStream(targetFormat, lowResAIS);
		}
		else
		{
			throw new UnsupportedAudioFileException("not supported!");
		}

		AudioSystem.write(lowResAIS, AudioFileFormat.Type.WAVE, out);
	}