waveinfo
Purpose
Wavelets information
Syntax
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
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