Sound Analysis and Synthesis Adaptive in Time and Two Frequency Bands

Details Sound Analysis and Synthesis Adaptive in Time and Two Frequency Bands Sound Analysis and Synthesis Adaptive in Time and Two Frequency Bands

2011-09-29

arxiv.org/abs/1109.6651v1

Proc. of the 14th Int. Conference on Digital Audio Effects (DAFx-11), Paris, France, September 19-23, 2011

Computer Science

Sound

Scientific paper

We present an algorithm for sound analysis and resynthesis with local automatic adaptation of time-frequency resolution. There exists several algorithms allowing to adapt the analysis window depending on its time or frequency location; in what follows we propose a method which select the optimal resolution depending on both time and frequency. We consider an approach that we denote as analysis-weighting, from the point of view of Gabor frame theory. We analyze in particular the case of different adaptive time-varying resolutions within two complementary frequency bands; this is a typical case where perfect signal reconstruction cannot in general be achieved with fast algorithms, causing a certain error to be minimized. We provide examples of adaptive analyses of a music sound, and outline several possibilities that this work opens.

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