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One channel spatio-temporal inversion of acoustic wave in reverberant cavities

Abstract : It has been recently shown that it was possible to optimally recover the Green functions from a complex wave field despite of a non-isotropic distribution of the noise sources. The method used is based on a particular use of the inverse filter (IF) formalism which is called the passive IF. Based on this formalism, we have investigated the possibility to control the spatio-temporal degrees of freedom in a reverberant cavity for the focusing of waves (active processes). The understanding of this phenomenon can be very useful in a lot of different applications like in acoustical imaging, seismology, or telecommunications. In the present work, the spatio-temporal focalization of ultrasounds in reverberant cavities is studied using medical arrays and water tanks. Through experiments, a complete spatio-temporal inversion is realized to synthesize optimized emitting signals. The result generalizes the focalization control over a spatial vector and during an arbitrary time window.
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https://hal-insu.archives-ouvertes.fr/insu-00681671
Contributor : Pascale Talour <>
Submitted on : Thursday, March 22, 2012 - 9:39:17 AM
Last modification on : Monday, July 20, 2020 - 10:46:02 AM

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Matthieu Rupin, Stefan Catheline, Philippe Roux. One channel spatio-temporal inversion of acoustic wave in reverberant cavities. Journal of the Acoustical Society of America, Acoustical Society of America, 2011, 130 (4), p.2515. ⟨10.1121/1.3655026⟩. ⟨insu-00681671⟩

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