Beamforming with a circular array of microphones mounted on a rigid sphere (L)

Elisabet Tiana Roig, Finn Jacobsen, Efren Fernandez Grande

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Beamforming with uniform circular microphone arrays can be used for localizing sound sources over 360. Typically, the array microphones are suspended in free space or they are mounted on a solid cylinder. However, the cylinder is often considered to be infinitely long because the scattering problem has no exact solution for a finite cylinder. Alternatively one can use a solid sphere. This investigation compares the performance of a circular array mounded on a rigid sphere with that of such an array in free space and mounted on an infinite cylinder, using computer simulations. The examined techniques are delay-and-sum and circular harmonics beamforming, and the results are validated experimentally.
Original languageEnglish
JournalJournal of the Acoustical Society of America
Issue number3
Pages (from-to)1095
Publication statusPublished - 2011


  • Shapes (structures)
  • Microphone arrays
  • Array signal processing
  • Acoustic signal processing
  • Acoustic radiators

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