A superdirective array of phase shift sources

Simón Gálvez, Marcos F., Elliott, Stephen J. and Cheer, Jordan (2012) A superdirective array of phase shift sources Journal of the Acoustical Society of America, 132, (2), pp. 746-756. (doi:10.1121/1.4733556).


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A superdirective array of audio drivers is described, which is compact compared with the acoustic wavelength over some of its frequency range. In order to minimize the overall sound power output, and hence reduce the excitation of the reverberant field when used in an enclosed space, the individual drivers are made directional by using phase shift enclosures. The motivating application for the array is the enhancement of sound from a television, in a particular region of space, to aid hearing impaired listeners. The design is initially investigated, using free-field simulations, by comparing the performance of 8 monopoles, 8 phase shift loudspeakers, and a double array of 16 monopoles, with a contrast maximization formulation. The construction and testing of an array of 8 drivers is then discussed, together with its measured response in an anechoic environment. The result of using acoustic contrast maximization is then compared with a least squares formulation, which demonstrates that the performance of the least squares solution can be made similar to that given by acoustic contrast maximization in this application, with a suitable choice of the target field.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1121/1.4733556
ISSNs: 0001-4966 (print)
Organisations: Signal Processing & Control Grp
ePrint ID: 342200
Date :
Date Event
June 2012Published
Date Deposited: 15 Aug 2012 11:01
Last Modified: 17 Apr 2017 16:41
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/342200

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