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An Adaptive Beam-Steering Microphone Array Implemented on the Motorola DSP56000 Digital Signal Processor

It has been suggested that beam-steering microphone arrays may provide considerable improvements over conventional directional microphones. This paper describes some of the relevant acoustic factors, and relates them to two basic methodologies of array beam-forming: source isolation/tracking and interference null steering. The basic theory of beam-forming is then reviewed, and methods of predicting array performance suggested. Results from practical work implementing an adaptive source isolation system in anechoic conditions are described, strongly validating proposed theory. Finally, deteriorated array performance in a real-room environment is presented, confirming the acoustic problems highlighted.

Authors: Angus, James A.; Kershaw, Simon; Lewis, Alwyn
Affiliations: The University of York, Heslington, York, UK ; Kings College, London, UK ; BT Labs, Martlesham Heath, Ipswich, UK(See document for exact affiliation information.)
AES Convention:95 (October 1993) Paper Number:3761 Import into BibTeX
Subject:Microphones and Loudspeakers

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