Wavelet Toolbox

waveinfo

Information on wavelets

Syntax

• waveinfo
  waveinfo('wname')
  

Description

waveinfo provides information on all wavelets within the toolbox.

waveinfo('wname') provides information on the wavelet family whose short name is specified by the string 'wname'. Available family short names are listed in the table below.

Wavelet Family Short Name	Wavelet Family Name
'haar'	Haar wavelet.
'db'	Daubechies wavelets.
'sym'	Symlets.
'coif'	Coiflets.
'bior'	Biorthogonal wavelets.
'rbio'	Reverse biorthogonal wavelets.
'meyr'	Meyer wavelet.
'dmey'	Discrete approximation of Meyer wavelet.
'gaus'	Gaussian wavelets.
'mexh'	Mexican hat wavelet.
'morl'	Morlet wavelet.
'cgau'	Complex Gaussian wavelets.
'shan'	Shannon wavelets.
'fbsp'	Frequency B-Spline wavelets.
'cmor'	Complex Morlet wavelets.

The family short names can also be user-defined ones (see wavemngr for more information).

waveinfo('wsys') provides information on wavelet packets.

Examples

• waveinfo('db')
  
  DBINFO Information on Daubechies wavelets. 
  Daubechies Wavelets 
  General characteristics: Compactly supported 
  wavelets with extremal phase and highest 
  number of vanishing moments for a given 
  support width. Associated scaling filters are 
  minimum-phase filters. 
  
  Family          Daubechies 
  Short name      db 
  Order N         N strictly positive integer 
  Examples        db1 or haar, db4, db15 
  
  Orthogonal      yes 
  Biorthogonal    yes 
  Compact support yes 
  DWT             possible 
  CWT             possible 
      
  Support width   2N-1 
  Filters length  2N 
  Regularity      about 0.2 N for large N 
  Symmetry        far from 
  Number of vanishing moments for psi     N 
  
  Reference:   I. Daubechies, 
  Ten lectures on wavelets CBMS, SIAM, 61, 1994, 194-202.
  

See Also
wavemngr

wavefun2

wavemenu