Wavelet Toolbox™

Recompose wavelet packet

Syntax

• T = wpjoin(T,N)
  [T,X] = wpjoin(T,N)
  T = wpjoin(T)
  [T,X] = wpjoin(T)
  

Description

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

wpjoin updates the wavelet packet tree after the recomposition of a node.

The nodes are numbered from left to right and from top to bottom. The root index is 0.

T = wpjoin(T,N) returns the modified wavelet packet tree T corresponding to a recomposition of the node N.

[T,X] = wpjoin(T,N) also returns the coefficients of the node.

T = wpjoin(T) is equivalent to T = wpjoin(T,0).

[T,X] = wpjoin(T) is equivalent to [T,X] = wpjoin(T,0).

Examples

• % The current extension mode is zero-padding (see dwtmode).
  
  % Load signal. 
  load noisdopp; x = noisdopp;
  
  % Decompose x at depth 3 with db1 wavelet packets. 
  wpt = wpdec(x,3,'db1');
  
  % Plot wavelet packet tree wpt. 
  plot(wpt)
  
  
  % Recompose packet (1,1) or 2 
  wpt = wpjoin(wpt,[1 1]);
  
  % Plot wavelet packet tree wpt. 
  plot(wpt)
  
  
  

See Also
wpdec, wpdec2, wpsplt

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