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com.sun.media.sound

public final Class FFT

Class Inheritance

extends Object

java.lang.Object
com.sun.media.sound.FFT

Fast Fourier Transformer.

Author: Karl Helgason

Field Summary

Modifier and Type	Field and Description
private final int[]	bitm_array
private final int	fftFrameSize
private final int	fftFrameSize2
private final int	sign
private final double[]	w

Constructor Summary

Access	Constructor and Description
public	FFT(int fftFrameSize, int sign)

Method Summary

Modifier and Type	Method and Description
private void	bitreversal(double[] data)
private static void	calc(int fftFrameSize, double[] data, int sign, double[] w)
private static void	calcF2E(int fftFrameSize, double[] data, int i, int nstep, double[] w)
private static void	calcF4F(int fftFrameSize, double[] data, int i, int nstep, double[] w)
private static void	calcF4FE(int fftFrameSize, double[] data, int i, int nstep, double[] w)
private static void	calcF4I(int fftFrameSize, double[] data, int i, int nstep, double[] w)
private static void	calcF4IE(int fftFrameSize, double[] data, int i, int nstep, double[] w)
private static double[]	computeTwiddleFactors(int fftFrameSize, int sign)
public void	transform(double[] data)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

bitm_array	back to summary
private final int[] bitm_array

fftFrameSize	back to summary
private final int fftFrameSize

fftFrameSize2	back to summary
private final int fftFrameSize2

sign	back to summary
private final int sign

w	back to summary
private final double[] w

Constructor Detail

FFT	back to summary
public FFT(int fftFrameSize, int sign)

Method Detail

bitreversal	back to summary
private void bitreversal(double[] data)

calc	back to summary
private static void calc(int fftFrameSize, double[] data, int sign, double[] w)

calcF2E	back to summary
private static void calcF2E(int fftFrameSize, double[] data, int i, int nstep, double[] w)

calcF4F	back to summary
private static void calcF4F(int fftFrameSize, double[] data, int i, int nstep, double[] w)

calcF4FE	back to summary
private static void calcF4FE(int fftFrameSize, double[] data, int i, int nstep, double[] w)

calcF4I	back to summary
private static void calcF4I(int fftFrameSize, double[] data, int i, int nstep, double[] w)

calcF4IE	back to summary
private static void calcF4IE(int fftFrameSize, double[] data, int i, int nstep, double[] w)

computeTwiddleFactors	back to summary
private static double[] computeTwiddleFactors(int fftFrameSize, int sign)

transform	back to summary
public void transform(double[] data)