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Generation of half-space sound fields with application to personal sound systems

Generation of half-space sound fields with application to personal sound systems
Generation of half-space sound fields with application to personal sound systems
A method is presented for generating a sound field that is significantly attenuated over half of the reproduction region, which has application to the generation of two independent sound fields for two listeners. The half-space sound field is produced by attenuating the negative or positive modes in the cylindrical or spherical expansion of a plane wave or point source sound field. It is shown that this is equivalent to adding to the original sound field, in quadrature, a second field which is the Hilbert transform of the original field. The resulting analytic field has a small magnitude in one half of the plane. Methods are presented for controlling the attenuation in the unwanted half-space. Finally, a simulation is presented showing the generation of a wideband pulse that propagates across half of the area within a circular array of sources.
0001-4966
1294-1302
Poletti, Mark A.
3f9971e2-dbc5-4b89-bb75-dd94d5352f27
Fazi, Filippo M.
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Poletti, Mark A.
3f9971e2-dbc5-4b89-bb75-dd94d5352f27
Fazi, Filippo M.
e5aefc08-ab45-47c1-ad69-c3f12d07d807

Poletti, Mark A. and Fazi, Filippo M. (2016) Generation of half-space sound fields with application to personal sound systems Journal of the Acoustical Society of America, 139, (3), pp. 1294-1302. (doi:10.1121/1.4944671).

Record type: Article

Abstract

A method is presented for generating a sound field that is significantly attenuated over half of the reproduction region, which has application to the generation of two independent sound fields for two listeners. The half-space sound field is produced by attenuating the negative or positive modes in the cylindrical or spherical expansion of a plane wave or point source sound field. It is shown that this is equivalent to adding to the original sound field, in quadrature, a second field which is the Hilbert transform of the original field. The resulting analytic field has a small magnitude in one half of the plane. Methods are presented for controlling the attenuation in the unwanted half-space. Finally, a simulation is presented showing the generation of a wideband pulse that propagates across half of the area within a circular array of sources.

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Accepted/In Press date: 10 March 2016
e-pub ahead of print date: 24 March 2016
Organisations: Acoustics Group

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Local EPrints ID: 399740
URI: http://eprints.soton.ac.uk/id/eprint/399740
ISSN: 0001-4966
PURE UUID: 48072866-3f4b-4afb-b0fa-4f32c906c1fc

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Date deposited: 25 Aug 2016 10:54
Last modified: 09 Jan 2018 17:54

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Contributors

Author: Mark A. Poletti
Author: Filippo M. Fazi

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