wprcoef (Wavelet Toolbox)

Reconstruct wavelet packet coefficients.

X = wprcoef(T,D,N)

Description

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

X = wprcoef(T,D,N) computes reconstructed coefficients of the node N. T is the tree structure and D the data structure (see maketree).

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

Examples

% 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,d] = wpdec(x,3,'db1','shannon');

% Plot tree structure. 
    plottree(t)




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

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