Enhancing the beamforming map of spherical arrays at low frequencies using acoustic holography

Elisabet Tiana Roig, Antoni Torras Rosell, Efren Fernandez Grande, Cheol-Ho Jeong, Finn T. Agerkvist

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    Abstract

    Recent studies have shown that the localization of acoustic sources based on circular arrays can be improved at low frequencies by combining beamforming with acoustic holography. This paper extends this technique to the three dimensional case by making use of spherical arrays. The pressure captured by a rigid spherical array under free-field conditions is used to compute the expected pressure on a virtual and larger sphere by means of acoustic holography. Beamforming is then applied with the pressure predicted at the virtual array. Since the virtual array has a larger radius compared to the one of the physical array, the low frequencies (the ones with larger wavelength) are better captured by the virtual array, and therefore, the performance of the resulting beamforming system is expected to improve at these frequencies. The proposed method is examined with simulations based on delay-and-sum beamforming. In addition, the principle is validated with experiments.
    Original languageEnglish
    Title of host publicationProceedings of BeBeC 2014
    Number of pages14
    Publication date2014
    ISBN (Electronic) 978-3-942709-12-5
    Publication statusPublished - 2014
    EventBerlin Beamforming Conference: BeBeC 2014 - Lecture Theatre of the Institute for Fluid Mechanics and Technical Acoustics, Berlin, Germany
    Duration: 19 Feb 201420 Feb 2014
    Conference number: 5

    Conference

    ConferenceBerlin Beamforming Conference
    Number5
    LocationLecture Theatre of the Institute for Fluid Mechanics and Technical Acoustics
    Country/TerritoryGermany
    CityBerlin
    Period19/02/201420/02/2014

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