PlayThatTuneDeluxe.java pgm

PlayThatTuneDeluxe.java

public class PlayThatTuneDeluxe 

{

           public static double[] sum(double[] a, double[] b, double awt, double bwt) 

          {

                  assert (a.length == b.length);

        double[] c = new double[a.length];

        for (int i = 0; i < a.length; i++) 

        {

            c[i] = a[i]*awt + b[i]*bwt;

        }

        return c;

    } 

            public static double[] tone(double hz, double duration) 

  { 

        int N = (int) (StdAudio.SAMPLE_RATE * duration);

        double[] a = new double[N+1];

        for (int i = 0; i <= N; i++) 

       {

            a[i] = Math.sin(2 * Math.PI * i * hz / StdAudio.SAMPLE_RATE);

        }

        return a; 

    } 

    public static double[] note(int pitch, double t) 

   {

        double hz = 440.0 * Math.pow(2, pitch / 12.0);

        double[] a  = tone(hz, t);

        double[] hi = tone(2*hz, t);

        double[] lo = tone(hz/2, t);

        double[] h  = sum(hi, lo, .5, .5);

        return sum(a, h, .5, .5);

     }

    public static void main(String[] args) 

    {

               while (!StdIn.isEmpty()) 

    {

            int pitch = StdIn.readInt();

            double duration = StdIn.readDouble();

            double[] a = note(pitch, duration);

            StdAudio.play(a);

        }

        System.exit(0);

    } 

}