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dc.contributorVirginia Tech. Department of Mechanical Engineeringen_US
dc.contributor.authorCho, Yong Thungen_US
dc.contributor.authorRoan, Michael J.en_US
dc.date.accessioned2015-05-27T19:50:22Z
dc.date.available2015-05-27T19:50:22Z
dc.date.issued2009-02-01
dc.identifier.citationCho, Y. T. & Roan, M. J. (2009). Adaptive near-field beamforming techniques for sound source imaging. Journal of the Acoustical Society of America, 125(2), 944-957. doi: 10.1121/1.3050248en_US
dc.identifier.issn0001-4966en_US
dc.identifier.urihttp://hdl.handle.net/10919/52676
dc.description.abstractPhased array signal processing techniques such as beamforming have a long history in applications such as sonar for detection and localization of far-field sound sources. Two sometimes competing challenges arise in any type of spatial processing; these are to minimize contributions from directions other than the look direction and minimize the width of the main lobe. To tackle this problem a large body of work has been devoted to the development of adaptive procedures that attempt to minimize side lobe contributions to the spatial processor output. In this paper, two adaptive beamforming procedures-minimum variance distorsionless response and weight optimization to minimize maximum side lobes-are modified for use in source visualization applications to estimate beamforming pressure and intensity using near-field pressure measurements. These adaptive techniques are compared to a fixed near-field focusing technique (both techniques use near-field beamforming weightings focusing at source locations estimated based on spherical wave array manifold vectors with spatial windows). Sound source resolution accuracies of near-field imaging procedures with different weighting strategies are compared using numerical simulations both in anechoic and reverberant environments with random measurement noise. Also, experimental results are given for near-field sound pressure measurements of an enclosed loudspeaker.en_US
dc.format.extent14 pagesen_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.publisherAcoustical Society of Americaen_US
dc.subjectAcoustic beamformingen_US
dc.subjectPressure measurementen_US
dc.subjectSound pressureen_US
dc.subjectAcoustical measurementsen_US
dc.subjectLoudspeakersen_US
dc.titleAdaptive near-field beamforming techniques for sound source imagingen_US
dc.typeArticle - Refereeden_US
dc.identifier.urlhttp://scitation.aip.org/content/asa/journal/jasa/125/2/10.1121/1.3050248en_US
dc.date.accessed2015-05-12en_US
dc.title.serialJournal of the Acoustical Society of Americaen_US
dc.identifier.doihttps://doi.org/10.1121/1.3050248
dc.type.dcmitypeTexten_US


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