Sound field reproduction as an equivalent acoustical scattering problem


Fazi, Filippo Maria and Nelson, Philip A. (2013) Sound field reproduction as an equivalent acoustical scattering problem Journal of the Acoustical Society of America, 134, (5), pp. 3721-3729. (doi:10.1121/1.4824343).

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Description/Abstract

Given a continuous distribution of acoustic sources, the determination of the source strength that ensures the synthesis of a desired sound field is shown to be identical to the solution of an equivalent acoustic scattering problem. The paper begins with the presentation of the general theory that under-pins sound field reproduction with secondary sources continuously arranged on the boundary of the reproduction region. The process of reproduction by a continuous source distribution is modeled by means of an integral operator (the single layer potential). It is then shown how the solution of the sound reproduction problem corresponds to that of an equivalent scattering problem. Analytical solutions are computed for two specific instances of this problem, involving, respectively, the use of a secondary source distribution in spherical and planar geometries. The results are shown to be the same as those obtained with analyses based on High Order Ambisonics and Wave Field Synthesis, respectively, thus bringing to light a fundamental analogy between these two methods of sound reproduction. Finally, it is shown how the physical optics (Kirchhoff) approximation enables the derivation of a high-frequency simplification for the problem under consideration, this in turn being related to the secondary source selection criterion reported in the literature on Wave Field Synthesis.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1121/1.4824343
ISSNs: 0001-4966 (print)
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Organisations: Inst. Sound & Vibration Research
ePrint ID: 359103
Date :
Date Event
2013Published
Date Deposited: 25 Oct 2013 16:15
Last Modified: 23 Feb 2017 02:16
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/359103

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