IMPORTANT WAVELETS FOR SPEECH COMPRESSION


In the  GUI you need to enter a valid wavelet. Here is a quick reference to the wavelets and their notations . You just need to type in the notation mentioned in the sequel.

1. The Haar wavelet.

           Any discussion of wavelets begins with Haar wavelet, the first and simplest. Haar wavelet is discontinuous, and resembles a step function. It represents the same wavelet as Daubechies db1.

    notation :  haar 

2. Daubechies
Ingrid Daubechies, one of the brightest stars in the world of wavelet research,invented what are called compactly supported orthonormal wavelets -- thus making discrete wavelet analysis practicable.

Notation :The names of the Daubechies family wavelets are written dbN, where N is the order,and db the "surname" of the wavelet. The db1 wavelet, as mentioned above, is the same as Haar wavelet. 

      eg: db1, db2, db3.......db10 are all valid wavelets recognized by MATLABŪ


3. Symlets
The symlets are nearly symmetrical wavelets proposed by Daubechies as
modifications to the db family. The properties of the two wavelet families are similar.
   

Notation : sym2, sym3.....,sym8  are all valid wavelets recognized by MATLABŪ