The influence of the spatial primary field properties on active control performance
The influence of the spatial primary field properties on active control performance
A general formulation is presented of the optimum controller in an active system for local sound control in a spatially random primary field. The sound field in a control region is selectively attenuated using secondary sources, driven by reference sensors, all of which are potentially remote from this control region. It is shown that the optimal controller has the form of a remote microphone system, with a least-squares estimation of the disturbance signals in the control region from the reference signals. The sound field under control is assumed to be generated by an array of primary sources, whose source strengths are specified using a spectral density matrix. This can easily be used to synthesize a diffuse primary field, if the primary sources are uncorrelated and far from the control region, but can also generate primary fields dominated by contributions from a particular direction, for example, which is shown to significantly affect the shape of the resulting zone of quiet.
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Cheer, J.
8e452f50-4c7d-4d4e-913a-34015e99b9dc
15 July 2014
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Cheer, J.
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Elliott, S.J. and Cheer, J.
(2014)
The influence of the spatial primary field properties on active control performance.
21st International Congress on Sound and Vibration, Beijing, Beijing, China.
13 - 17 Jul 2014.
7 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
A general formulation is presented of the optimum controller in an active system for local sound control in a spatially random primary field. The sound field in a control region is selectively attenuated using secondary sources, driven by reference sensors, all of which are potentially remote from this control region. It is shown that the optimal controller has the form of a remote microphone system, with a least-squares estimation of the disturbance signals in the control region from the reference signals. The sound field under control is assumed to be generated by an array of primary sources, whose source strengths are specified using a spectral density matrix. This can easily be used to synthesize a diffuse primary field, if the primary sources are uncorrelated and far from the control region, but can also generate primary fields dominated by contributions from a particular direction, for example, which is shown to significantly affect the shape of the resulting zone of quiet.
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Published date: 15 July 2014
Venue - Dates:
21st International Congress on Sound and Vibration, Beijing, Beijing, China, 2014-07-13 - 2014-07-17
Organisations:
Signal Processing & Control Grp
Identifiers
Local EPrints ID: 367761
URI: http://eprints.soton.ac.uk/id/eprint/367761
PURE UUID: 6a2028ad-84fd-4874-9af1-365b40bb35f2
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Date deposited: 15 Sep 2014 07:56
Last modified: 15 Mar 2024 03:37
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