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arXiv · 1109.6313

A Reduced Multiple Gabor Frame for Local Time Adaptation of the Spectrogram

M. Liuni·A. Röbel·M. Romito·X. Rodet
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Abstract

In this paper we propose a method for automatic local time adap- tation 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.

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M. Liuni, A. Röbel, M. Romito, X. Rodet. 2011-09-27. A Reduced Multiple Gabor Frame for Local Time Adaptation of the Spectrogram. https://arxiv.org/abs/1109.6313

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