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%0 Conference Proceedings
%A Liuni, Marco
%A Roebel, Axel
%A Romito, Marco
%A Rodet, Xavier
%T A REDUCED MULTIPLE GABOR FRAME FOR LOCAL TIME ADAPTATION OF THE SPECTROGRAM
%D 2010
%B Digital Audio Effects
%C Graz
%F Liuni10c
%K adaptive spectrogram
%K sound representation
%K sound analysis
%K sound synthesis
%K Rényi entropies
%K sparsity measures
%K frame theory.
%X 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.
%1 6
%2 2
%U http://articles.ircam.fr/textes/Liuni10c/