Open Access

The Fusion of Distributed Microphone Arrays for Sound Localization

EURASIP Journal on Advances in Signal Processing20032003:860465

Received: 1 November 2001

Published: 30 March 2003


This paper presents a general method for the integration of distributed microphone arrays for localization of a sound source. The recently proposed sound localization technique, known as SRP-PHAT, is shown to be a special case of the more general microphone array integration mechanism presented here. The proposed technique utilizes spatial likelihood functions (SLFs) produced by each microphone array and integrates them using a weighted addition of the individual SLFs. This integration strategy accounts for the different levels of access that a microphone array has to different spatial positions, resulting in an intelligent integration strategy that weighs the results of reliable microphone arrays more significantly. Experimental results using 10 2-element microphone arrays show a reduction in the sound localization error from 0.9 m to 0.08 m at a signal-to-noise ratio of 0 dB. The proposed technique also has the advantage of being applicable to multimodal sensor networks.


microphone arrayssound localizationsensor integrationinformation fusionsensor fusion

Authors’ Affiliations

Department of Electrical and Computer Engineering, University of Toronto, Toronto, Canada


© Copyright © 2003 Hindawi Publishing Corporation 2003