On the angular error of intensity vector based direction of arrival estimation in reverberant sound fields.

Dovid Levin, Emanuël A.P. Habets, Sharon Gannot

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46 Scopus citations

Abstract

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 dependent 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.

Original languageEnglish
Pages (from-to)1800-1811
Number of pages12
JournalJournal of the Acoustical Society of America
Volume128
Issue number4
DOIs
StatePublished - Oct 2010

Bibliographical note

Funding Information:
This research was supported by the Marie Curie Intra European Fellowship within the 7th European Community Framework Programme under Contract No. PIEF-GA-2009-237246.

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