Multichannel equalisation for high-order spherical microphone arrays using beamformed channels

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Title: Multichannel equalisation for high-order spherical microphone arrays using beamformed channels
Authors: Moore, AH
Evers, C
Naylor, PA
Item Type: Conference Paper
Abstract: High-order spherical microphone arrays offer many practical benefits including relatively fine spatial resolution in all directions and rotation invariant processing using eigenbeams. Spatial filtering can reduce interference from noise and reverberation but in even moderately reverberant environments the beam pattern fails to suppress reverberation to a level adequate for typical applications. In this paper we investigate the feasibility of applying dereverberation by considering multiple beamformer outputs as channels to be dereverberated. In one realisation we process directly in the spherical harmonic domain where the beampatterns are mutually orthogonal. In a second realisation, which is not limited to spherical microphone arrays, beams are pointed in the direction of dominant reflections. Simulations demonstrate that in both cases reverberation is significantly reduced and, in the best case, clarity index is improved by 15 dB.
Issue Date: 21-Jul-2015
Date of Acceptance: 20-Apr-2015
ISSN: 1546-1874
Publisher: IEEE
Start Page: 1211
End Page: 1215
Journal / Book Title: Proceedings of the 2015 IEEE International Conference on Digital Signal Processing (DSP)
Copyright Statement: © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: 609465
Conference Name: 2015 IEEE International Conference on Digital Signal Processing (DSP)
Publication Status: Published
Start Date: 2015-07-21
Finish Date: 2015-07-24
Conference Place: Singapore
Appears in Collections:Faculty of Engineering
Electrical and Electronic Engineering

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