org.oc.ocvolume.dsp
クラス fft

java.lang.Object
  上位を拡張 org.oc.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

作成者:
Danny Su

フィールドの概要
static double[] imag
          imaginary part
protected static int numPoints
          number of points
static double[] real
          real part
 
コンストラクタの概要
fft()
           
 
メソッドの概要
static void computeFFT(double[] signal)
          performs Fast Fourier Transformation
calls: none
called by: featureExtraction
 
クラス java.lang.Object から継承されたメソッド
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

フィールドの詳細

numPoints

protected static int numPoints
number of points


real

public static double[] real
real part


imag

public static double[] imag
imaginary part

コンストラクタの詳細

fft

public fft()
メソッドの詳細

computeFFT

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

パラメータ:
signal -