ocvolume.dsp
Class fft

java.lang.Object
  |
  +--ocvolume.dsp.fft

public class fft

extends java.lang.Object

last updated on June 15, 2002
description: FFT class for real signals. Upon entry, N contains the numbers of points in the DFT, real[] and imaginary[] contain the real and imaginary parts of the input. Upon return, real[] and imaginary[] contain the DFT output. All signals run from 0 to N - 1
calls: none
called by: featureExtraction
input: speech signal
output: real and imaginary part of DFT output

Field Summary

static double[]	imag imaginary part
protected static int	numPoints number of points
static double[]	real real part

Constructor Summary

fft()

Method Summary

static void

computeFFT(double[] signal) performs Fast Fourier Transformation calls: none called by: featureExtraction

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

numPoints

protected static int numPoints

number of points

real

public static double[] real

real part

imag

public static double[] imag

imaginary part

Constructor Detail

fft

public fft()

Method Detail

computeFFT

public static void computeFFT(double[] signal)

performs Fast Fourier Transformation
calls: none
called by: featureExtraction

Parameters:

signal -