Regularised reconstruction of sound fields with a spherical microphone array

Alba Granados Corsellas, Finn Jacobsen, Efren Fernandez Grande

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Spherical near field acoustic holography with microphones mounted on a rigid spherical surface is used to reconstruct the incident sound field. However, reconstruction outside the sphere is an ill-posed inverse problem, and since this is very sensitive to the measurement noise, straightforward implementation might lead to disastrous reconstructions. A large number of regularisation tools based on singular value decomposition are available, and it has been found that the acoustic holography problem for certain geometries can be formulated in such a way that similarities to singular value decomposition become apparent. Hence, a number of regularisation methods, including truncated singular value decomposition, standard Tikhonov, constrained Tikhonov, iterative Tikhonov, Landweber and Rutishauser, have been adapted for spherical near field acoustic holography. The accuracy of the methods is examined by means of simulations and measurements, which leads to practical recommendations on the use of regularisation techniques regarding space and frequency.
Original languageEnglish
JournalMeetings on Acoustics. Proceedings
Volume19
Number of pages9
ISSN1939-800X
Publication statusPublished - 2013
Event21st International Congress on Acoustics - Montreal, Canada
Duration: 2 Jun 20137 Jun 2013
Conference number: 21
http://www.ica2013montreal.org/

Conference

Conference21st International Congress on Acoustics
Number21
CountryCanada
CityMontreal
Period02/06/201307/06/2013
Internet address

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