This paper is concerned with experimental validation of a recently proposed method of controlling sound fields with a circular double-layer array of loudspeakers [Chang and Jacobsen, J. Acoust. Soc. Am. 131(6), 4518–4525 (2012)]. The double-layer of loudspeakers is realized with 20 pairs of closed-box loudspeakers mounted back-to-back. Source strengths are obtained with several solution methods by modeling loudspeakers as a weighted combination of monopoles and dipoles. Sound pressure levels of the controlled sound fields are measured inside and outside the array in an anechoic room, and performance indices are calculated. The experimental results show that a method of combining pure contrast maximization with a pressure matching technique provides only a small error in the listening zone between the desired and the reproduced fields, and at the same time reduces the sound level in the quiet zone as expected in the simulation studies well above the spatial Nyquist frequency except at a few frequencies. It is also shown that errors in the positions of the loudspeakers can be critical to the results at frequencies where the distance between the inner and the outer array is close to half a wavelength.
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April 2013
April 03 2013
Experimental validation of sound field control with a circular double-layer array of loudspeakers
Ji-Ho Chang;
Ji-Ho Chang
a)
Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark
, Building 352, DK-2800 Kongens Lyngby, Denmark
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Finn Jacobsen
Finn Jacobsen
Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark
, Building 352, DK-2800 Kongens Lyngby, Denmark
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a)
Author to whom correspondence should be addressed. Current address: Center for Applied Hearing Research, Department of Electrical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark. Electronic mail: chang.jiho@gmail.com
J. Acoust. Soc. Am. 133, 2046–2054 (2013)
Article history
Received:
September 24 2012
Accepted:
February 04 2013
Citation
Ji-Ho Chang, Finn Jacobsen; Experimental validation of sound field control with a circular double-layer array of loudspeakers. J. Acoust. Soc. Am. 1 April 2013; 133 (4): 2046–2054. https://doi.org/10.1121/1.4792486
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