Microphone Array Source Localization Using Realizable Delay Vectors

Scott M. Griebel and Michael S. Brandstein

To appear at Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA01), Mohonk Mountain Resort, NY, 21-24 October 2001


This paper presents an alternative approach to acoustic source localization which modifies the traditional two-step localization procedure to not require explicit time-delay estimates. Instead, the cross-correlation functions derived from various microphone pairs are simultaneously maximized over a set of potential delay combinations consistent with candidate source locations. The result is a procedure that combines the advantages offered by the PHAT weighting (or any reasonable cross-correlation type function) and a more robust localization procedure without dramatically increasing computational load. Simulations are performed across a range of reverberation conditions to illustrate the utility of the proposed method relative to conventional GCC filtering approaches and a more modern eigenvalue-based technique.

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