Sound reproduction systems using variable-directivity
loudspeakers
Sound reproduction systems using variable-directivity
loudspeakers
Sound reproduction systems using omnidirectional loudspeakers produce reflections from room surfaces which interfere with the desired sound field within the array. While active compensation systems can reduce the reverberant level, they require calibration in each room and are processor-intensive. Directional loudspeakers allow the direct to reverberant level to be improved within the array, but still produce a finite exterior field which reflects from the room surfaces. The use of variable directivity loudspeakers allows the exterior field to be eliminated at low frequencies by implementing the Kirchhoff–Helmholtz integral equation. This paper investigates the performance of variable-directivity arrays in reducing reverberant levels and compares the results with those derived in a previous paper for fixed-directivity arrays. The results presented may have some impact on the design of commercial multi-channel systems for sound reproduction.
architectural acoustics, loudspeakers, reverberation, sound reproduction
1429-1438
Poletti, M.A.
712a0d5a-7209-4785-8e13-b1ad0edf1fd2
Fazi, F.M.
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Nelson, P.A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
9 March 2011
Poletti, M.A.
712a0d5a-7209-4785-8e13-b1ad0edf1fd2
Fazi, F.M.
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Nelson, P.A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Poletti, M.A., Fazi, F.M. and Nelson, P.A.
(2011)
Sound reproduction systems using variable-directivity
loudspeakers.
Journal of the Acoustical Society of America, 129 (3), .
(doi:10.1121/1.3533689).
Abstract
Sound reproduction systems using omnidirectional loudspeakers produce reflections from room surfaces which interfere with the desired sound field within the array. While active compensation systems can reduce the reverberant level, they require calibration in each room and are processor-intensive. Directional loudspeakers allow the direct to reverberant level to be improved within the array, but still produce a finite exterior field which reflects from the room surfaces. The use of variable directivity loudspeakers allows the exterior field to be eliminated at low frequencies by implementing the Kirchhoff–Helmholtz integral equation. This paper investigates the performance of variable-directivity arrays in reducing reverberant levels and compares the results with those derived in a previous paper for fixed-directivity arrays. The results presented may have some impact on the design of commercial multi-channel systems for sound reproduction.
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Published date: 9 March 2011
Keywords:
architectural acoustics, loudspeakers, reverberation, sound reproduction
Organisations:
Fluid Dynamics & Acoustics Group
Identifiers
Local EPrints ID: 179027
URI: http://eprints.soton.ac.uk/id/eprint/179027
ISSN: 0001-4966
PURE UUID: c82a63cb-3562-413d-bcc5-9bc213989c28
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Date deposited: 31 Mar 2011 11:05
Last modified: 15 Mar 2024 02:32
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Author:
M.A. Poletti
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