Wavelet Toolbox™

Wavelet center frequency

Syntax

• FREQ = centfrq('wname')
  FREQ = centfrq('wname',ITER)
  [FREQ,XVAL,RECFREQ] = centfrq('wname',ITER,'plot')
  

Description

FREQ = centfrq('wname') returns the center frequency in herz of the wavelet function, 'wname' (see wavefun for more information).

For FREQ = centfrq('wname',ITER), ITER is the number of iterations performed by the function wavefun, which is used to compute the wavelet.

[FREQ,XVAL,RECFREQ] = centfrq('wname',ITER,'plot') returns, in addition, the associated center frequency based approximation RECFREQ on the 2^ITER points grid XVAL and plots the wavelet function and RECFREQ.

Examples

• % Example 1: a real wavelet 
  wname = 'db2';
  
  % Compute the center frequency and display
  % the wavelet function and the associated 
  % center frequency based approximation.
  iter = 8;
  cfreq = centfrq(wname,8,'plot')
  
  cfreq =
      0.6667
  
  
  % Example 2: a complex wavelet 
  wname = 'cgau6';
  
  % Compute the center frequency and display 
  % the wavelet function and the associated 
  % center frequency based approximation.
  cfreq = centfrq(wname,8,'plot')
  
  cfreq =
  
      0.6000
  
  
  

See Also
scal2frq, wavefun

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