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Communication dans un congrès

Odontocete click train deinterleaving using a single hydrophone and rhythm analysis

Olivier Le Bot 1 Julien Bonnel 2 Jerome Mars 3 Cedric Gervaise 3
1 AP
STIC - Pôle STIC [Brest]
STIC - Pôle STIC [Brest], Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
3 GIPSA-SIGMAPHY - GIPSA - Signal Images Physique
GIPSA-DIS - Département Images et Signal
Abstract : Most odontocetes live in pods of several individuals, resulting in an overlapping of click trains recorded by passive acoustic monitoring systems. Localization algorithms and click classifiers are usually used for train separation. However, their performances fall down if individuals are too close to each other or if acoustical parameters vary greatly from click to click, respectively. Assuming odontocete clicks follow rhythmic patterns, we propose to use a rhythm analysis to separate mixed click trains from a single hydrophone. The proposed algorithm is based only on inter-click-intervals (ICI) to cluster clicks into trains. It uses information given by complex-valued autocorrelation to compute a histogram which will exhibit peaks at ICIs corresponding to interleaved trains. By this technique, subharmonics corresponding to multiples of ICIs are automatically suppressed. The algorithm is then extended by a time-period analysis leading to a time-varying ICI spectrum. A threshold can be applied on this spectrum to detect the different interleaved trains. The final result is a binary time-ICI map on which trains can be fully and easily distinguished and extracted. We validate it on simulated and experimental data and we show that the algorithm is particularly suitable as a preprocessing tool prior to localization and classification schemes.
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Contributeur : Annick Billon-Coat <>
Soumis le : mercredi 10 juillet 2013 - 17:55:49
Dernière modification le : jeudi 10 décembre 2020 - 08:52:09

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Olivier Le Bot, Julien Bonnel, Jerome Mars, Cedric Gervaise. Odontocete click train deinterleaving using a single hydrophone and rhythm analysis. 21st International Congress on Acoustics (ICA 2013) - 165th Meeting of the Acoustical Society of America, Jun 2013, Montreal, Canada. ⟨10.1121/1.4800655⟩. ⟨hal-00843208⟩



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