Interior and exterior sound field control using two dimensional higher-order variable-directivity sources

The Journal of the Acoustical Society of America
M A PolettiP Samarasinghe

Abstract

Spatial sound reproduction systems aim to produce a desired sound field over a volume of space. At high frequencies, the number of loudspeakers required is prohibitive. This paper shows that the use of loudspeakers with up to Nth order directivity allows reproduction over N times the bandwidth and produces a significantly attenuated exterior sound field. If the constraint on exterior cancellation of the field is removed, reproduction is possible over approximately 2N times the bandwidth. The use of higher order loudspeakers thus allows a significant reduction in the number of loudspeaker units, at the expense of increased complexity in each unit. For completeness, results are included for the generation of an exterior field with or without cancellation of the interior field.

References

Mar 12, 2005·The Journal of the Acoustical Society of America·Philippe-Aubert GauthierWieslaw Woszczyk
May 19, 2005·The Journal of the Acoustical Society of America·Terence Betlehem, Thushara D Abhayapala
Jul 7, 2007·The Journal of the Acoustical Society of America·Sascha SporsWolfgang Herbordt
May 12, 2009·The Journal of the Acoustical Society of America·Boaz Rafaely
Aug 18, 2009·Disasters·Jozsef Betlehem, Jurgen Schaefer
Jun 17, 2010·The Journal of the Acoustical Society of America·M PolettiP A Nelson
Feb 10, 2011·The Journal of the Acoustical Society of America·M A Poletti, T D Abhayapala
Mar 25, 2011·The Journal of the Acoustical Society of America·M A PolettiP A Nelson

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Citations

Sep 23, 2014·The Journal of the Acoustical Society of America·Terence Betlehem, Mark A Poletti
Apr 6, 2013·The Journal of the Acoustical Society of America·Ji-Ho Chang, Finn Jacobsen
Jul 6, 2014·The Journal of the Acoustical Society of America·Mark A PolettiThushara D Abhayapala
Nov 15, 2018·The Journal of the Acoustical Society of America·Prasanga N SamarasingheGlenn Dickins
Nov 3, 2017·The Journal of the Acoustical Society of America·Prasanga SamarasingheWalter Kellermann
Nov 4, 2020·The Journal of the Acoustical Society of America·Yi Ren, Yoichi Haneda

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