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).


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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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.jsv.2014.03.025
ISSNs: 0022-460X (print)
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Organisations: Acoustics Group
ePrint ID: 365408
Date :
Date Event
21 April 2014e-pub ahead of print
4 August 2014Published
Date Deposited: 03 Jun 2014 16:22
Last Modified: 17 Apr 2017 13:43
Further Information:Google Scholar

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