Adaptive near-field beamforming techniques for sound source imaging

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dc.contributorVirginia Tech. Department of Mechanical Engineeringen
dc.contributor.authorCho, Yong Thungen
dc.contributor.authorRoan, Michael J.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessed2015-05-12en
dc.date.accessioned2015-05-27T19:50:22Zen
dc.date.available2015-05-27T19:50:22Zen
dc.date.issued2009-02-01en
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
dc.format.extent14 pagesen
dc.format.mimetypeapplication/pdfen
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
dc.identifier.doihttps://doi.org/10.1121/1.3050248en
dc.identifier.issn0001-4966en
dc.identifier.urihttp://hdl.handle.net/10919/52676en
dc.identifier.urlhttp://scitation.aip.org/content/asa/journal/jasa/125/2/10.1121/1.3050248en
dc.language.isoen_USen
dc.publisherAcoustical Society of Americaen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAcoustic beamformingen
dc.subjectPressure measurementen
dc.subjectSound pressureen
dc.subjectAcoustical measurementsen
dc.subjectLoudspeakersen
dc.titleAdaptive near-field beamforming techniques for sound source imagingen
dc.title.serialJournal of the Acoustical Society of Americaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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