Module tagtraum.jipesfft

Package com.tagtraum.jipesfft

Class PureJavaFFT

java.lang.Object

com.tagtraum.jipesfft.AbstractFFT

com.tagtraum.jipesfft.PureJavaFFT

All Implemented Interfaces:

AutoCloseable

public class PureJavaFFT
extends AbstractFFT

Pure Java FFT for a specific number of samples. Used as fallback for certain cases by FFT.

Author:

Hendrik Schreiber

Field Summary

Fields inherited from class com.tagtraum.jipesfft.AbstractFFT

FREQUENCY, IMAGINARY, REAL

Constructor Summary

Constructors

Constructor	Description
PureJavaFFT(int numberOfSamples)	Constructor for a given number of samples.

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	equals(Object o)
int	hashCode()
float[][]	inverseTransform(float[] real, float[] imaginary)	Perform inverse transform.
void	transform(boolean inverse, float[] realIn, float[] imaginaryIn, float[] realOut, float[] imaginaryOut)	Actual fast Fourier transform implementation.
float[][]	transform(float[] real)	Transform for real numbers.
float[][]	transform(float[] real, float[] imaginary)	Transform for complex numbers.

Methods inherited from class com.tagtraum.jipesfft.AbstractFFT

getFrequencies, getFrequencyForBin, getNumberOfSamples, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

PureJavaFFT

public PureJavaFFT(int numberOfSamples)

Constructor for a given number of samples.

Parameters:

numberOfSamples - number of samples you intend to transform, must be a power of two

Method Detail

inverseTransform

public float[][] inverseTransform(float[] real,
                                  float[] imaginary)

Perform inverse transform.

Specified by:

inverseTransform in class AbstractFFT

Parameters:

real - real part

imaginary - imaginary part

Returns:

two-dimensional array for the real and the imaginary parts

transform

public float[][] transform(float[] real)

Transform for real numbers.

Specified by:

transform in class AbstractFFT

Parameters:

real - samples

Returns:

three-dimensional array, consisting of the real part, the imaginary, and the frequencies

transform

public float[][] transform(float[] real,
                           float[] imaginary)

Transform for complex numbers.

Specified by:

transform in class AbstractFFT

Parameters:

real - real part

imaginary - imaginary part

Returns:

three-dimensional array, consisting of the real part, the imaginary, and the frequencies

transform

public void transform(boolean inverse,
                      float[] realIn,
                      float[] imaginaryIn,
                      float[] realOut,
                      float[] imaginaryOut)

Actual fast Fourier transform implementation.

Parameters:

inverse - inverse or not

realIn - real portion input

imaginaryIn - imaginary in

realOut - real out

imaginaryOut - imaginary out

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

close

public void close()