Wave field synthesis of a virtual source located in proximity to a loudspeaker array

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For the derivation of 2.5-dimensional operator in wave field synthesis, a virtual source is assumed to be positioned far from a loudspeaker array. However, such far-field approximation inevitably results in a reproduction error when the virtual source is placed adjacent to an array. In this paper, a method is proposed to generate a virtual source close to and behind a continuous line array of loudspeakers. A driving function is derived by reducing a surface integral (Rayleigh integral) to a line integral based on the near-field assumption. The solution is then combined with the far-field formula of wave field synthesis by introducing a weighting function that can adjust the near- and far-field contribution of each driving function. This enables production of a virtual source anywhere in relation to the array. Simulations show the proposed method can reduce the reproduction error to below -18 dB, regardless of the virtual source position. (C) 2013 Acoustical Society of America.
Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
Issue Date
2013-09
Language
English
Article Type
Article
Keywords

REPRODUCTION

Citation

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, v.134, no.3, pp.2106 - 2117

ISSN
0001-4966
DOI
10.1121/1.4817876
URI
http://hdl.handle.net/10203/187152
Appears in Collection
EE-Journal Papers(저널논문)ME-Journal Papers(저널논문)
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