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Article: Room noise filtering by shunted loudspeaker

TitleRoom noise filtering by shunted loudspeaker
Authors
KeywordsShunted Loudspeaker
Electro-magnetic Coupling
Room Noise Absorber
Issue Date2014
PublisherJTD Editorial Board. The Journal's web site is located at http://www.jtdweb.org/
Citation
Journal of Temporal Design, 2014, v. 12 n. 1, p. 13-24 How to Cite?
AbstractThere are a variety of needs in room acoustics, such as the control of ventilation noise, adjustment of reverberation time and selective enhancement of echos over some frequency bands. All these call for a tunable sound absorber. This work describes an electro-acoustic method to design such an absorber, which is here described as an acoustic filter. The absorber consists of a moving-coil loudspeaker diaphragm backed by a cavity. When incident noise pushes the diaphragm, it moves and its structural damping consumes some sound energy. An RLC shunt circuit is attached to the moving coil giving an electrically induced mechanical impedance that alters the acoustic behaviour of the shunted loudspeaker. By manipulating component values of the shunt RLC circuit, the absorber drains noise at flexibly chosen frequency bands and at any assigned absorption levels, much like designing an electronic filter. The essential part of the theory is validated by experiment.
Persistent Identifierhttp://hdl.handle.net/10722/203021
ISSN

 

DC FieldValueLanguage
dc.contributor.authorZhang, Yen_US
dc.contributor.authorZhang, ZYen_US
dc.contributor.authorHuang, Len_US
dc.date.accessioned2014-09-19T11:08:06Z-
dc.date.available2014-09-19T11:08:06Z-
dc.date.issued2014en_US
dc.identifier.citationJournal of Temporal Design, 2014, v. 12 n. 1, p. 13-24en_US
dc.identifier.issn1346-7824-
dc.identifier.urihttp://hdl.handle.net/10722/203021-
dc.description.abstractThere are a variety of needs in room acoustics, such as the control of ventilation noise, adjustment of reverberation time and selective enhancement of echos over some frequency bands. All these call for a tunable sound absorber. This work describes an electro-acoustic method to design such an absorber, which is here described as an acoustic filter. The absorber consists of a moving-coil loudspeaker diaphragm backed by a cavity. When incident noise pushes the diaphragm, it moves and its structural damping consumes some sound energy. An RLC shunt circuit is attached to the moving coil giving an electrically induced mechanical impedance that alters the acoustic behaviour of the shunted loudspeaker. By manipulating component values of the shunt RLC circuit, the absorber drains noise at flexibly chosen frequency bands and at any assigned absorption levels, much like designing an electronic filter. The essential part of the theory is validated by experiment.-
dc.languageengen_US
dc.publisherJTD Editorial Board. The Journal's web site is located at http://www.jtdweb.org/-
dc.relation.ispartofJournal of Temporal Designen_US
dc.subjectShunted Loudspeaker-
dc.subjectElectro-magnetic Coupling-
dc.subjectRoom Noise Absorber-
dc.titleRoom noise filtering by shunted loudspeakeren_US
dc.typeArticleen_US
dc.identifier.emailZhang, Y: yumin@hku.hken_US
dc.identifier.emailHuang, L: lixi@hku.hken_US
dc.identifier.authorityHuang, L=rp00119en_US
dc.description.naturelink_to_OA_fulltext-
dc.identifier.hkuros236530en_US
dc.identifier.volume12en_US
dc.identifier.issue1-
dc.identifier.spage13en_US
dc.identifier.epage24en_US
dc.publisher.placeJapan-

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