math.jwave.transforms

Class WaveletPacketTransform

java.lang.Object

math.jwave.transforms.BasicTransform

math.jwave.transforms.WaveletTransform

math.jwave.transforms.WaveletPacketTransform

public class WaveletPacketTransform
extends WaveletTransform

Base class for the forward and reverse Wavelet Packet Transform (WPT) also called Wavelet Packet Decomposition (WPD) using a specified Wavelet by inheriting class.

Constructor Summary

Constructors

Constructor and Description
WaveletPacketTransform(Wavelet wavelet) Constructor receiving a Wavelet object.
WaveletPacketTransform(Wavelet wavelet, int steps) Constructor receiving a Wavelet object.

Method Summary

Modifier and Type	Method and Description
double[]	forward(double[] arrTime) Implementation of the 1-D forward wavelet packet transform for arrays of dim N by filtering with the longest wavelet first and then always with both sub bands -- low and high (approximation and details) -- by the next smaller wavelet.
double[]	reverse(double[] arrHilb) Implementation of the 1-D reverse wavelet packet transform for arrays of dim N by filtering with the smallest wavelet for all sub bands -- low and high bands (approximation and details) -- and the by the next greater wavelet combining two smaller and all other sub bands.

Methods inherited from class math.jwave.transforms.BasicTransform

forward, forward, forward, reverse, reverse, reverse

Methods inherited from class java.lang.Object

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

Constructor Detail

WaveletPacketTransform

public WaveletPacketTransform(Wavelet wavelet)

Constructor receiving a Wavelet object.

Parameters:

wavelet - object of type Wavelet; Haar02, Daub02, Coif06, ...

Throws:

JWaveException

WaveletPacketTransform

public WaveletPacketTransform(Wavelet wavelet,
                              int steps)

Constructor receiving a Wavelet object.

Parameters:

wavelet - object of type Wavelet; Haar02, Daub02, Coif06, ...

steps - how many steps the algorithm should perform

Throws:

JWaveException

Method Detail

forward

public double[] forward(double[] arrTime)

Implementation of the 1-D forward wavelet packet transform for arrays of dim N by filtering with the longest wavelet first and then always with both sub bands -- low and high (approximation and details) -- by the next smaller wavelet.

Specified by:

forward in class BasicTransform

Parameters:

arrTime - coefficients of 1-D time domain

Returns:

coefficients of 1-D frequency or Hilbert domain

See Also:

BasicTransform.forward(double[])

reverse

public double[] reverse(double[] arrHilb)

Implementation of the 1-D reverse wavelet packet transform for arrays of dim N by filtering with the smallest wavelet for all sub bands -- low and high bands (approximation and details) -- and the by the next greater wavelet combining two smaller and all other sub bands.

Specified by:

reverse in class BasicTransform

Parameters:

arrHilb - coefficients of 1-D frequency or Hilbert domain

Returns:

coefficients of 1-D time domain

See Also:

BasicTransform.reverse(double[])