This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.


Reconstruct wavelet packet coefficients


X = wprcoef(T,N)
X = wprcoef(T)
X = wprcoef(T,0)


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

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

X = wprcoef(T) is equivalent to X = wprcoef(T,0).


% The current extension mode is zero-padding (see dwtmode)

% Load signal. 
load noisdopp; x = noisdopp;

figure(1); subplot(211); 
plot(x); title('Original signal');

% Decompose x at depth 3 with db1 wavelet packets 
% using Shannon entropy. 
t = wpdec(x,3,'db1','shannon');

% Plot wavelet packet tree. 

% Reconstruct packet (2,1). 
rcfs = wprcoef(t,[2 1]);

figure(1); subplot(212); 
plot(rcfs); title('Reconstructed packet (2,1)');

Introduced before R2006a

Was this topic helpful?