View my previous post for playing any PCM amplitude array.
Generate Sine wave of a particular frequency :
private static byte[] generateSineWavefreq(int frequencyOfSignal, int seconds) {
// total samples = (duration in second) * (samples per second)
byte[] sin = new byte[seconds * sampleRate];
double samplingInterval = (double) (sampleRate / frequencyOfSignal);
System.out.println("Sampling Frequency : "+sampleRate);
System.out.println("Frequency of Signal : "+frequencyOfSignal);
System.out.println("Sampling Interval : "+samplingInterval);
for (int i = 0; i < sin.length; i++) {
double angle = (2.0 * Math.PI * i) / samplingInterval;
sin[i] = (byte) (Math.sin(angle) * 127);
System.out.println("" + sin[i]);
}