Sound reproduction systems using variable-directivity loudspeakers

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), 1429-1438. (doi:10.1121/1.3533689).


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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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1121/1.3533689
ISSNs: 0001-4966 (print)
1520-8524 (electronic)
Keywords: architectural acoustics, loudspeakers, reverberation, sound reproduction
Subjects: Q Science > QC Physics
R Medicine > R Medicine (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions : University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Fluid Dynamics and Acoustics
ePrint ID: 179027
Accepted Date and Publication Date:
9 March 2011Published
Date Deposited: 31 Mar 2011 11:05
Last Modified: 31 Mar 2016 13:34

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