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A REDUCED MULTIPLE GABOR FRAME FOR LOCAL TIME ADAPTATION OF THE SPECTROGRAM

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text
 

Genre(s)

article
 

Forme(s)

document numérique
 

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Titre

A REDUCED MULTIPLE GABOR FRAME FOR LOCAL TIME ADAPTATION OF THE SPECTROGRAM
 

Nom(s)

Liuni, Marco (auteur)
 
Roebel, Axel (auteur)
 
Romito, Marco (auteur)
 
Rodet, Xavier (auteur)
 

Publication

Graz, Austria , 2010
 

Description

Sujet(s)

adaptive spectrogram   sound representation   sound analysis   sound synthesis   Rényi entropies   sparsity measures   frame theory.
 

Résumé

In this paper we propose a method for automatic local time adaptation of the spectrogram of an audio signal, based on its decomposition within a Gabor multi-frame. The sparsity of the analyses within each individual frame is evaluated through the Rényi entropies measures. According to the sparsity of the decompositions, an optimal resolution and a reduced multi-frame are determined, defining an adapted spectrogram with variable resolution and hop size. The composition of such a reduced multi-frame allows an immediate definition of a dual frame: re-synthesis techniques for this adapted analysis are easily derived by the traditional phase vocoder scheme.
 

Note(s)

Contribution au colloque ou congrès : Digital Audio Effects
 

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Date de la notice

2010-07-02 02:00:00
 

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