This paperpresentsastrategyfortheapplicationofacousticbeamformingtolocate noise sourcesinareverberantfield. In thehypothesisofstationaryphenomena,theaverageamplitudeandstandard deviationoftheoutputofbeamforming,obtainedfromdifferentarraylocations,are calculated. The standarddeviation,normalizedbythemaximumvalue,canbeusedfor beamformingoutputweighting,soastoenhancethesourcecontribution,whichis spaceinvariant,andtoattenuatethemirrorsandsidelobepeaks,whosespatialposition changeswithchangesinarrayposition. The availabilityofmicrophonesignalsacquiredwhenmovingthearraytoadifferent positionalsoallowsasuper-arraytobeobtained,i.e.anarrayobtainedconsideringall thedataascomingfromauniquearray.Inthisway,thecapabilityoftheaveraging proceduretorejectmirrorseffectsanddisturbancesiscombinedwithhighresolution beamformingforapplicationinreverberantfields.Theseimprovementsareextendedto theentirefrequencyrange,sincetheprocedureisnotgreatlyaffectedbysignal wavelength.

Acoustic source localization in a reverberant environment by average beamforming / Castellini, Paolo; Sassaroli, Andrea. - In: MECHANICAL SYSTEMS AND SIGNAL PROCESSING. - ISSN 0888-3270. - 29:(2010), pp. 796-808.

Acoustic source localization in a reverberant environment by average beamforming

CASTELLINI, Paolo;SASSAROLI, ANDREA
2010-01-01

Abstract

This paperpresentsastrategyfortheapplicationofacousticbeamformingtolocate noise sourcesinareverberantfield. In thehypothesisofstationaryphenomena,theaverageamplitudeandstandard deviationoftheoutputofbeamforming,obtainedfromdifferentarraylocations,are calculated. The standarddeviation,normalizedbythemaximumvalue,canbeusedfor beamformingoutputweighting,soastoenhancethesourcecontribution,whichis spaceinvariant,andtoattenuatethemirrorsandsidelobepeaks,whosespatialposition changeswithchangesinarrayposition. The availabilityofmicrophonesignalsacquiredwhenmovingthearraytoadifferent positionalsoallowsasuper-arraytobeobtained,i.e.anarrayobtainedconsideringall thedataascomingfromauniquearray.Inthisway,thecapabilityoftheaveraging proceduretorejectmirrorseffectsanddisturbancesiscombinedwithhighresolution beamformingforapplicationinreverberantfields.Theseimprovementsareextendedto theentirefrequencyrange,sincetheprocedureisnotgreatlyaffectedbysignal wavelength.
2010
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/31454
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