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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).

Record type: Article


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.

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Published date: June 2012
Organisations: Signal Processing & Control Grp


Local EPrints ID: 342200
ISSN: 0001-4966
PURE UUID: c138eeb6-3109-44a7-87ba-edc68a0bcb03
ORCID for Jordan Cheer: ORCID iD

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Date deposited: 15 Aug 2012 11:01
Last modified: 18 Jul 2017 05:30

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Author: Marcos F. Simón Gálvez
Author: Jordan Cheer ORCID iD

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