Personal audio with multiple dark zones

Jones, Matthew and Elliott, Stephen J. (2008) Personal audio with multiple dark zones. Journal of the Acoustical Society of America, 124, (6), 3497-3506. (doi:10.1121/1.2996325).


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This work considers providing personal audio for a listener by use of a local array of acoustic sources driven in such a way as to maintain the reproduced levels in one seat, in the so-called “bright zone,” while minimizing the levels experienced by others sitting close by, in the so-called “dark zones.” Multiple dark zones are considered both adjacent to and in front of the listener, initially using monopole simulations to investigate three different control strategies, and it is shown that a particular orientation of two sources is able to provide good control over the dark zones in these directions. It is shown that minimizing the sound power radiated by the local array while constraining the reproduced level in the bright zone is an effective method of achieving isolation when the dark zones are numerous. The findings of the investigations are used to design an optimal source arrangement, for which the isolation performance is improved by about 20 dB up to 1 kHz, which is verified with Boundary Element Method (BEM) models and predictions based on measured responses.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1121/1.2996325
ISSNs: 0001-4966 (print)
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions : University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Signal Processing and Control
ePrint ID: 65366
Accepted Date and Publication Date:
December 2008Published
Date Deposited: 05 Feb 2009
Last Modified: 31 Mar 2016 12:50
Near field acoustic arrays for personal audio
Funded by: EPSRC (GR/S63915/01)
1 October 2004 to 30 September 2007

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