Near-field characteristics of the parametric loudspeaker using ultrasonic transducers

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dc.contributor.authorJu, Hyeong Sickko
dc.contributor.authorKim, Yang-Hannko
dc.date.accessioned2013-03-11T20:38:14Z-
dc.date.available2013-03-11T20:38:14Z-
dc.date.created2012-02-06-
dc.date.created2012-02-06-
dc.date.issued2010-09-
dc.identifier.citationAPPLIED ACOUSTICS, v.71, no.9, pp.793 - 800-
dc.identifier.issn0003-682X-
dc.identifier.urihttp://hdl.handle.net/10203/100215-
dc.description.abstractA parametric speaker is a device for generating and focusing highly directional sound beams. It is essentially a by-product that comes with the nonlinearity of ultrasound. It is noteworthy that this directional beam was controlled and utilized mostly for far-field applications in the past. We empirically study the directivity and attenuation characteristics of the parametric loudspeaker in the near-field where we desire to use it. Physical parameters for experiments are imported from a theoretical model based on the far-field approximation. The findings are that increases in aperture size and modulation frequency cause higher directivity, but have more than twice the beamwidth of the far-field approximation. The attenuation also does not obey the inverse-square law which describes far-field spreading from acoustic sources. The results conclusively explain a series of formation and attenuation of the virtual sound sources and define limitations of use in the near-field. (C) 2010 Elsevier Ltd. All rights reserved.-
dc.languageEnglish-
dc.publisherELSEVIER SCI LTD-
dc.subjectRADIATION-
dc.subjectDESIGN-
dc.subjectARRAY-
dc.titleNear-field characteristics of the parametric loudspeaker using ultrasonic transducers-
dc.typeArticle-
dc.identifier.wosid000280534600002-
dc.identifier.scopusid2-s2.0-77954176103-
dc.type.rimsART-
dc.citation.volume71-
dc.citation.issue9-
dc.citation.beginningpage793-
dc.citation.endingpage800-
dc.citation.publicationnameAPPLIED ACOUSTICS-
dc.identifier.doi10.1016/j.apacoust.2010.04.004-
dc.contributor.localauthorKim, Yang-Hann-
dc.contributor.nonIdAuthorJu, Hyeong Sick-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorParametric loudspeaker-
dc.subject.keywordAuthorNear-field-
dc.subject.keywordAuthorDirectivity-
dc.subject.keywordAuthorAttenuation-
dc.subject.keywordAuthorSpurious signal-
dc.subject.keywordPlusRADIATION-
dc.subject.keywordPlusDESIGN-
dc.subject.keywordPlusARRAY-
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