Experimental validation of sound field control with a circular double-layer array of loudspeakers.

Jiho Chang, Finn Jacobsen

Research output: Contribution to journalJournal articleResearchpeer-review

373 Downloads (Pure)

Abstract

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.
Original languageEnglish
JournalAcoustical Society of America. Journal
Volume133
Issue number4
Pages (from-to)2046
ISSN0001-4966
DOIs
Publication statusPublished - 2013

Keywords

  • Acoustic field
  • Architectural acoustics
  • Loudspeakers
  • Nyquist criterion

Fingerprint Dive into the research topics of 'Experimental validation of sound field control with a circular double-layer array of loudspeakers.'. Together they form a unique fingerprint.

Cite this