Acoustic centering of sources measured by surrounding spherical microphone arrays

Ilan Ben Hagai, Martin Pollow, Michael Vorlnder, Boaz Rafaely

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The radiation patterns of acoustic sources have great significance in a wide range of applications, such as measuring the directivity of loudspeakers and investigating the radiation of musical instruments for auralization. Recently, surrounding spherical microphone arrays have been studied for sound field analysis, facilitating measurement of the pressure around a sphere and the computation of the spherical harmonics spectrum of the sound source. However, the sound radiation pattern may be affected by the location of the source inside the microphone array, which is an undesirable property when aiming to characterize source radiation in a unique manner. This paper presents a theoretical analysis of the spherical harmonics spectrum of spatially translated sources and defines four measures for the misalignment of the acoustic center of a radiating source. Optimization is used to promote optimal alignment based on the proposed measures and the errors caused by numerical and array-order limitations are investigated. This methodology is examined using both simulated and experimental data in order to investigate the performance and limitations of the different alignment methods.

Original languageEnglish
Pages (from-to)2003-2015
Number of pages13
JournalJournal of the Acoustical Society of America
Issue number4
StatePublished - 1 Oct 2011

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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