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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
