Package edu.wisc.ssec.mcidasv.adt

Class FFT

java.lang.Object
edu.wisc.ssec.mcidasv.adt.FFT
public class FFT extends Object

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private static int
    FFTBINS
     
    private static double[]
    fftComplex
     
    private static double[]
    fftMagnitude
     
    private static double[]
    fftReal
     

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    private
    FFT()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static int
    calculateFFT(double[] inputArray)
     
    private static double
    complexAbs(double realValue, double imaginaryValue)
     
    private static int
    dfft()
    A Duhamel-Hollman split-radix dif FFT.

    Methods inherited from class java.lang.Object

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

  • Field Details

    • FFTBINS

      private static int FFTBINS

    • fftReal

      private static double[] fftReal

    • fftComplex

      private static double[] fftComplex

    • fftMagnitude

      private static double[] fftMagnitude

  • Constructor Details

    • FFT

      private FFT()

  • Method Details

    • dfft

      private static int dfft()
      A Duhamel-Hollman split-radix dif FFT. Ref: Electronics Letters, Jan. 5, 1984 Complex input and output data in arrays x and y Length is n. Inputs : RealArray_Input - Input data array to perform FFT analysis CmplxArray_Input - Empty on input NumBins - Number of histogram bins in input array Outputs : RealArray_Input - Real part of FFT Analysis CmplxArray_Input - Complex part of FFT Analysis
      Returns:
      Values <= 0 are errors, while anything > 0 is ok.

    • complexAbs

      private static double complexAbs(double realValue, double imaginaryValue)

    • calculateFFT

      public static int calculateFFT(double[] inputArray)