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Controlled sound field with a dual layer loudspeaker array

Shin, Mincheol, Fazi, Filippo Maria, Nelson, Philip Arthur and Casagrande Hirono, Fabio (2014) Controlled sound field with a dual layer loudspeaker array Journal of Sound and Vibration, 333, (16), pp. 3794-3817. (doi:10.1016/j.jsv.2014.03.025).

Record type: Article


Controlled sound interference has been extensively investigated using a prototype dual layer loudspeaker array comprised of 16 loudspeakers. Results are presented for measures of array performance such as input signal power, directivity of sound radiation and accuracy of sound reproduction resulting from the application of conventional control methods such as minimization of error in mean squared pressure, maximization of energy difference and minimization of weighted pressure error and energy. Procedures for selecting the tuning parameters have also been introduced. With these conventional concepts aimed at the production of acoustically bright and dark zones, all the control methods used require a trade-off between radiation directivity and reproduction accuracy in the bright zone. An alternative solution is proposed which can achieve better performance based on the measures presented simultaneously by inserting a low priority zone named as the “gray” zone. This involves the weighted minimization of mean-squared errors in both bright and dark zones together with the gray zone in which the minimization error is given less importance. This results in the production of directional bright zone in which the accuracy of sound reproduction is maintained with less required input power. The results of simulations and experiments are shown to be in excellent agreement.

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e-pub ahead of print date: 21 April 2014
Published date: 4 August 2014
Organisations: Acoustics Group


Local EPrints ID: 365408
ISSN: 0022-460X
PURE UUID: 836ba858-07ea-4af6-b903-ef2a138c3588
ORCID for Fabio Casagrande Hirono: ORCID iD

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Date deposited: 03 Jun 2014 16:22
Last modified: 18 Jul 2017 02:21

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Author: Mincheol Shin

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