~ajb

FFT

FFT
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br.usp.ime.dspbenchmarking.algorithms

Class FFT

  • java.lang.Object
    • br.usp.ime.dspbenchmarking.algorithms.FFT

  • public class FFT
extends java.lang.Object

    • Field Summary

      Fields 
      Modifier and Type Field and Description
      private int[] bitreverse 
      private int bits 
      private static int LOG2_MAXFFTSIZE 
      private static int MAXFFTSIZE 
      private static double TWOPI
      A Java implementation of the fast Fourier transform written by Jef Poskanzer.

    • Constructor Summary

      Constructors 
      Constructor and Description
      FFT(int bits)
      FFT class constructor Initializes code for doing a fast Fourier transform

    • Method Summary

      Methods 
      Modifier and Type Method and Description
      void doFFT(double[] xr, double[] xi, boolean invFlag)
      A fast Fourier transform routine
      void setBits(int bits) 

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • TWOPI

        private static final double TWOPI
        A Java implementation of the fast Fourier transform written by Jef Poskanzer. The copyright appears above.
        See Also:
        Constant Field Values

      • bits

        private int bits

      • bitreverse

        private int[] bitreverse

    • Constructor Detail

      • FFT

        public FFT(int bits)
        FFT class constructor Initializes code for doing a fast Fourier transform
        Parameters:
        int - bits is a power of two such that 2^b is the number of samples.

    • Method Detail

      • setBits

        public void setBits(int bits)
        Parameters:
        bits -

      • doFFT

        public void doFFT(double[] xr,
         double[] xi,
         boolean invFlag)
        A fast Fourier transform routine
        Parameters:
        double - [] xr is the real part of the data to be transformed
        double - [] xi is the imaginary part of the data to be transformed (normally zero unless inverse transofrm is effect).
        boolean - invFlag which is true if inverse transform is being applied. false for a forward transform.