Concept

Impédance acoustique

Publications associées (37)

Acoustic tomography for estimating temperature and wind flow

Martin Vetterli, Luciano Sbaiz, Ivana Jovanovic

We consider the problem of reconstructing superimposed temperature and wind flow fields from acoustic measurements. A new technique based solely on acoustic wave propagation is presented. In contrast to the usual straight ray assumption, a bent ray model i ...

2006

Étude des fondements physiques possibles des concepts numériques utilisés dans les méthodes d'acoustique géométrique

Thomas Guignard

The subject of the work presented here is the study of the acoustical ray method, which aims at describing a pressure field by an analogy with light rays. The concept of a wave is therefore replaced by the concept of "acoustical rays", whose paths through ...

EPFL2006

Spatio-Temporal Analysis of Spontaneous Speech with Microphone Arrays

Guillaume Lathoud

Accurate detection, localization and tracking of multiple moving speakers permits a wide spectrum of applications. Techniques are required that are versatile, robust to environmental variations, and not constraining for non-technical end-users. Based on di ...

IDIAP2006

Spatio-Temporal Analysis of Spontaneous Speech with Microphone Arrays

Guillaume Lathoud

École Polytechnique Fédérale de Lausanne2006

Acoustic and visual study of bubble formation processes in bubble columns staged with fibrous catalytic layers

Albert Renken, Lioubov Kiwi, Volker Höller

High-speed images of bubbly flow coupled with simultaneous passive acoustic measurements were carried out in a bubble column staged with structured fibrous catalysts. Local observations made with a high-speed camera system allow a detailed understanding of ...

2003

Les Matériaux Actifs à Propriétés Acoustiques Variables

Hervé Lissek

This work deals with the concept of active materials with variable acoustic properties, dedicated to room acoustics applications. This concept is based on an acoustic impedance active control principle by hybrid motionnal feedback, applied on an electroaco ...

Université du Maine2002

Contribution à l'étude des modes de rayonnement acoustique d'une structure

Olivier Schevin

Noise radiated by different industrial structures that surround us in daily life are more and more considered as environmental pollution. Standards defining a tolerable sound level for each of these noise sources are regularly called into question and resp ...

EPFL2001

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