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This paper discusses principles of microphone array beamforming, specifically   the use of LMS algorithm with training sequence. The problem of wideband   nature of acoustical signals and its impact on the techniques of beamforming   are discussed. Detailed explanation of classic narrowband and wideband LMS   beamformers is presented, as well as the modification of narrowband algorithm   with pre-steering. Experimental testing and comparison of algorithm   performances was conducted and measurement results are presented. The used   microphone array is part of Brüel & Kjær acoustical camera, and is comprised   of 18 omnidirectional non-uniformly spaced microphones

Comparison of LMS adaptive beamforming techniques in microphone arrays