An acoustic vector sensor provides measurements of both the pressure and particle velocity of a sound field in which it is placed. These measurements are vectorial in nature and can be used for the purpose of source localization. A straightforward approach towards determining the direction of arrival (DOA) utilizes the acoustic intensity vector, which is the product of pressure and particle velocity. The accuracy of an intensity vector based DOA estimator in the presence of noise has been analyzed previously. In this paper, the effects of reverberation upon the accuracy of such a DOA estimator are examined. It is shown that particular realizations of reverberation differ from an ideal isotropically diffuse field, and induce an estimation bias which is dependant upon the room impulse responses (RIRs). The limited knowledge available pertaining the RIRs is expressed statistically by employing the diffuse qualities of reverberation to extend Polack’s statistical RIR model. Expressions for evaluating the typical bias magnitude as well as its probability distribution are derived.
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October 2010
October 18 2010
On the angular error of intensity vector based direction of arrival estimation in reverberant sound fields
Dovid Levin;
Dovid Levin
School of Engineering,
Bar-Ilan University
, Ramat-Gan 52900, Israel
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Emanuël A. P. Habets;
Emanuël A. P. Habets
a)
Department of Electrical and Electronic Engineering,
Imperial College London
, Exhibition Road, SW7 2AZ London, United Kingdom
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Sharon Gannot
Sharon Gannot
School of Engineering,
Bar-Ilan University
, Ramat-Gan 52900, Israel
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a)
Author to whom correspondence should be addressed. Electronic mail: e.habets@imperial.ac.uk.
J. Acoust. Soc. Am. 128, 1800–1811 (2010)
Article history
Received:
April 30 2010
Accepted:
July 24 2010
Citation
Dovid Levin, Emanuël A. P. Habets, Sharon Gannot; On the angular error of intensity vector based direction of arrival estimation in reverberant sound fields. J. Acoust. Soc. Am. 1 October 2010; 128 (4): 1800–1811. https://doi.org/10.1121/1.3479542
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