Comparison of LMS adaptive beamforming techniques in microphone arrays | Zendy

Miloš Bjelić | Zendy; Miodrag Stanojević | Zendy

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Comparison of LMS adaptive beamforming techniques in microphone arrays

Author(s) -

Miloš Bjelić,

Miodrag Stanojević

Publication year - 2015

Publication title -

serbian journal of electrical engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.133

H-Index - 5

eISSN - 2217-7183

pISSN - 1451-4869

DOI - 10.2298/sjee1501001b

Subject(s) - narrowband , beamforming , microphone array , wideband , microphone , adaptive beamformer , omnidirectional antenna , acoustics , computer science , noise canceling microphone , least mean squares filter , electronic engineering , adaptive filter , engineering , algorithm , telecommunications , physics , antenna (radio) , sound pressure

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

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