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

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

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.

beamforming, speech dereverberation, spherical microphone array
1211-1215
Institute of Electrical and Electronics Engineers Inc.
Moore, Alastair H.
58d011fd-6a02-449a-9b77-651e8c86166e
Evers, Christine
93090c84-e984-4cc3-9363-fbf3f3639c4b
Naylor, Patrick A.
13079486-664a-414c-a1a2-01a30bf0997b
Moore, Alastair H.
58d011fd-6a02-449a-9b77-651e8c86166e
Evers, Christine
93090c84-e984-4cc3-9363-fbf3f3639c4b
Naylor, Patrick A.
13079486-664a-414c-a1a2-01a30bf0997b

Moore, Alastair H., Evers, Christine and Naylor, Patrick A. (2015) Multichannel equalisation for high-order spherical microphone arrays using beamformed channels. In 2015 IEEE International Conference on Digital Signal Processing, DSP 2015. vol. 2015-September, Institute of Electrical and Electronics Engineers Inc. pp. 1211-1215 . (doi:10.1109/ICDSP.2015.7252072).

Record type: Conference or Workshop Item (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.

Full text not available from this repository.

More information

Published date: 9 September 2015
Venue - Dates: IEEE International Conference on Digital Signal Processing, DSP 2015, , Singapore, Singapore, 2015-07-20 - 2015-07-23
Keywords: beamforming, speech dereverberation, spherical microphone array

Identifiers

Local EPrints ID: 446043
URI: http://eprints.soton.ac.uk/id/eprint/446043
PURE UUID: 17053ee8-c7de-4459-9d42-ce899beae83b
ORCID for Christine Evers: ORCID iD orcid.org/0000-0003-0757-5504

Catalogue record

Date deposited: 19 Jan 2021 17:33
Last modified: 18 Feb 2021 17:41

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