wprcoef

Reconstruct wavelet packet coefficients

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Syntax

X = wprcoef(T)
X = wprcoef(T,N)

Description

X = wprcoef(T) reconstructs coefficients of the node 0 of the wavelet packet tree T.

wprcoef is a one- or two-dimensional wavelet packet analysis function.

X = wprcoef(T,N) reconstructs coefficients of the node N of the wavelet packet tree T.

example

Examples

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Open Live Script

Load and plot a signal.

load noisdopp
plot(noisdopp)
title("Original Signal")

Figure contains an axes object. The axes object with title Original Signal contains an object of type line.

Decompose the original signals at depth 3 with db1 wavelet packets using Shannon entropy. To handle the problem of border distortion, the wpdec function uses zero padding as the extension mode. For more information, see dwtmode.

T = wpdec(noisdopp,3,"db1","shannon");

Plot the wavelet packet tree. 

plot(T)

Figure contains 2 axes objects and other objects of type uimenu. Axes object 1 with title Tree Decomposition contains 29 objects of type line, text. Axes object 2 with title data for node: 0 or (0,0). contains an object of type line.

Reconstruct the packet at node (2,1).

X = wprcoef(T,[2 1]);

Plot the reconstructed packet.

plot(X)
title("Reconstructed Packet (2,1)")

Figure contains an axes object. The axes object with title Reconstructed Packet (2,1) contains an object of type line.

Input Arguments

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Wavelet packet tree, specified as a wptree object.

Node in the wavelet packet tree T, specified as a nonnegative integer or as a pair of nonnegative integers.

Output Arguments

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Reconstructed coefficients of the wavelet packet, returned as a row vector.

Version History

Introduced before R2006a

See Also

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