Abstract

E. Chassande-Mottin, F. Auger, P. Flandrin,
"Supervised Time-Frequency Reassignment,"
IEEE Int. Symp. on Time-Frequency and Time-Scale Analysis, Paris, Juin 1996.

Supervised time-frequency reassignment

The reassignment method has been proved to improve the time-frequency representation of deterministic signals and especially of "chirp-like" FM signals. Unfortunately, reassignment presents some limitations when broadband noise is present. In this case, the squeezing process yields peaked areas in noise-only regions : this drawback should be avoided, since a rather flat energy distribution should be expected there. We propose in this paper an improvement to the spectrogram reassignment, based on a multi-window procedure, which brings a solution to this kind of problem. The efficiency of the proposed method is illustrated by numerical simulations and supported by quantitative measures.

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