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Pré-publication, Document de travail

Synthesis-based time-scale transforms for non-stationary signals

Abstract : This paper deals with the modeling of non-stationary signals, from the point of view of signal synthesis. A class of random, non-stationary signals, generated by synthesis from a random timescale representation, is introduced and studied. Non-stationarity is implemented in the timescale representation through a prior distribution which models the action of time warping on a stationary signal. A main originality of the approach is that models directly a timescale representation from which signals can be synthesized, instead of post-processing a pre-computed timescale transform. A maximum a posteriori estimator is proposed for the time warping parameters and the power spectrum of an underlying stationary signal, together with an iterative algorithm, called JEFAS-S, for the estimation, based upon the Expectation Maximization approach. Numerical results show the ability of JEFAS-S to estimate accurately time warping and power spectrum. This is in particular true when time warping involves fast variations, where a similar approach called JEFAS, proposed earlier, fails. In addition, as a by-product, the approach is able to yield extremely sharp timescale representations, also in the case of fast varying non-stationarity, where standard approaches such as synchrosqueezing fail.
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Pré-publication, Document de travail
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https://hal.archives-ouvertes.fr/hal-03669280
Contributeur : Bruno Torrésani Connectez-vous pour contacter le contributeur
Soumis le : lundi 16 mai 2022 - 15:00:22
Dernière modification le : mardi 17 mai 2022 - 03:51:45

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ACHA_MT.pdf
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  • HAL Id : hal-03669280, version 1

Citation

Adrien Meynard, Bruno Torrésani. Synthesis-based time-scale transforms for non-stationary signals. 2022. ⟨hal-03669280⟩

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