Head tracking extends local active control of broadband sound to higher frequencies
Head tracking extends local active control of broadband sound to higher frequencies
Local active sound control systems provide useful reductions in noise within a zone of quiet which only extends to about one tenth of an acoustic wavelength. If active control is required above a few hundred hertz, this generally limits the movement of a listener to unrealistically small changes in head position. We describe a local active sound control system using a fixed array of monitoring microphones, in which the pressures at the ear positions are estimated from these microphone signals using head position information from an optical head tracker. These signals are then actively controlled to give robust attenuation at the ear positions, even as the listener moves their head. Feedforward control provides selective attenuation of noise and broadband attenuation of around 20 dB is measured up to excitation frequencies of 1 kHz under favourable conditions, with head tracking achieved in a few seconds. The active control performance is thus comparable with that achieved with active headphones, but without the listener having anything attached to their head.
1-7
Elliott, Stephen J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Jung, Woomin
d8734210-d7b3-48dc-ace0-3724cd864f37
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
29 March 2018
Elliott, Stephen J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Jung, Woomin
d8734210-d7b3-48dc-ace0-3724cd864f37
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Elliott, Stephen J., Jung, Woomin and Cheer, Jordan
(2018)
Head tracking extends local active control of broadband sound to higher frequencies.
Scientific Reports, 8, , [5403].
(doi:10.1038/s41598-018-23531-y).
Abstract
Local active sound control systems provide useful reductions in noise within a zone of quiet which only extends to about one tenth of an acoustic wavelength. If active control is required above a few hundred hertz, this generally limits the movement of a listener to unrealistically small changes in head position. We describe a local active sound control system using a fixed array of monitoring microphones, in which the pressures at the ear positions are estimated from these microphone signals using head position information from an optical head tracker. These signals are then actively controlled to give robust attenuation at the ear positions, even as the listener moves their head. Feedforward control provides selective attenuation of noise and broadband attenuation of around 20 dB is measured up to excitation frequencies of 1 kHz under favourable conditions, with head tracking achieved in a few seconds. The active control performance is thus comparable with that achieved with active headphones, but without the listener having anything attached to their head.
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Final_submitted_2nd_revised_Broadband_activecontrol_180301
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s41598-018-23531-y
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Accepted/In Press date: 14 March 2018
e-pub ahead of print date: 29 March 2018
Published date: 29 March 2018
Identifiers
Local EPrints ID: 419071
URI: http://eprints.soton.ac.uk/id/eprint/419071
ISSN: 2045-2322
PURE UUID: 8804c992-c2a5-4c3b-bf2b-9f86b1ca42f1
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Date deposited: 28 Mar 2018 16:30
Last modified: 16 Mar 2024 06:21
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Author:
Woomin Jung
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