Constant beamwidth beamforming

Authors:
Michael M. Goodwin;Gary W. Elko
Affiliations:
Acoustics Research Department, AT&T Bell Laboratories, Murray Hill, NJ;Acoustics Research Department, AT&T Bell Laboratories, Murray Hill, NJ
Venue:
ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: plenary, special, audio, underwater acoustics, VLSI, neural networks - Volume I
Year:
1993

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Fast communication: Subband design of fixed wideband beamformers based on the least squares approach

Signal Processing

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Abstract

The beamwidth of a linear array decreases as frequency increases. For wideband beamformers such as microphone arrays intended for teleconferencing, this frequency dependence implies that signals incident on the outer portions of the main beam are subject to the undesirable effects of lowpass filtering. In this paper we discuss several ways of attaining beamwidth constancy and present a novel method based on superimposing several marginally steered beams to form a constant beamwidth multi-beam. This method provides an analytically tractable framework for designing constant beamwidth beamformers.