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Theoretical and experimental comparative analysis of beamforming methods for loudspeaker arrays under given performance constraints

Theoretical and experimental comparative analysis of beamforming methods for loudspeaker arrays under given performance constraints
Theoretical and experimental comparative analysis of beamforming methods for loudspeaker arrays under given performance constraints
Methods for beamforming are available that provide the signals used to drive an array of sources for the implementation of systems for the so-called personal audio. In this work, performance of the delay-and-sum (DAS) method and of three widely used methods for optimal beamforming are compared by means of computer simulations and experiments in an anechoic environment using a linear array of sources with given constraints on quality of the reproduced field at the listener's position and limit to input energy to the array. Using the DAS method as a benchmark for performance, the frequency domain responses of the loudspeaker filters can be characterized in three regions. In the first region, at low frequencies, input signals designed with the optimal methods are identical and provide higher directivity performance than that of the DAS. In the second region, performance of the optimal methods are similar to the DAS method. The third region starts above the limit due to spatial aliasing. A method is presented to estimate the boundaries of these regions.
0022-460X
302-324
Olivieri, Ferdinando
02d11b82-4e34-441f-9e04-60fb117d6617
Fazi, Filippo Maria
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Nelson, Philip
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Mincheol, Shin
37f14f64-bc86-400a-bbfd-41fdaf2216a5
Fontana, Simone
12b85430-cb97-4d02-bc8b-024dfecbc1b2
Lang, Yue
f06b66cf-8019-4566-a7cb-93fa7038582c
Olivieri, Ferdinando
02d11b82-4e34-441f-9e04-60fb117d6617
Fazi, Filippo Maria
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Nelson, Philip
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Mincheol, Shin
37f14f64-bc86-400a-bbfd-41fdaf2216a5
Fontana, Simone
12b85430-cb97-4d02-bc8b-024dfecbc1b2
Lang, Yue
f06b66cf-8019-4566-a7cb-93fa7038582c

Olivieri, Ferdinando, Fazi, Filippo Maria, Nelson, Philip, Mincheol, Shin, Fontana, Simone and Lang, Yue (2016) Theoretical and experimental comparative analysis of beamforming methods for loudspeaker arrays under given performance constraints Journal of Sound and Vibration, 373, pp. 302-324. (doi:10.1016/j.jsv.2016.03.005).

Record type: Article

Abstract

Methods for beamforming are available that provide the signals used to drive an array of sources for the implementation of systems for the so-called personal audio. In this work, performance of the delay-and-sum (DAS) method and of three widely used methods for optimal beamforming are compared by means of computer simulations and experiments in an anechoic environment using a linear array of sources with given constraints on quality of the reproduced field at the listener's position and limit to input energy to the array. Using the DAS method as a benchmark for performance, the frequency domain responses of the loudspeaker filters can be characterized in three regions. In the first region, at low frequencies, input signals designed with the optimal methods are identical and provide higher directivity performance than that of the DAS. In the second region, performance of the optimal methods are similar to the DAS method. The third region starts above the limit due to spatial aliasing. A method is presented to estimate the boundaries of these regions.

Text OlivieriEtAl_JSV2016.pdf - Accepted Manuscript
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Accepted/In Press date: 6 March 2016
e-pub ahead of print date: 5 April 2016
Published date: 7 July 2016
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 389552
URI: http://eprints.soton.ac.uk/id/eprint/389552
ISSN: 0022-460X
PURE UUID: 7451bef7-43c7-4b35-ae0e-dcd135e8161a

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Date deposited: 09 Mar 2016 11:13
Last modified: 10 Jan 2018 05:30

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Contributors

Author: Ferdinando Olivieri
Author: Philip Nelson
Author: Shin Mincheol
Author: Simone Fontana
Author: Yue Lang

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