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Published on: October 29, 2018
Spheroidal ambisonics: Spatial audio in spheroidal bases
Shoken Kaneko1, Ramani Duraiswami1
1Perceptual Interfaces and Reality Laboratory, Computer Science and UMIACS, University of Maryland, College Park, Maryland 20742, USA kaneko60@umd.edu, ramanid@umd.edu.
Abstract:
Ambisonics is an established framework to capture and reproduce spatial sound fields based on the spherical harmonics representation [Gerzon (1973). J. Audio Eng. Soc. 21(1), 2-10]. A generalization-spheroidal ambisonics-based on spheroidal wave functions is proposed for use with spheroidal microphone arrays. Analytical conversion from spheroidal ambisonics to spherical ambisonics are derived to ensure compatibility with the existing ambisonics ecosystem. Numerical experiments verify spheroidal ambisonics encoding and transcoding for spatial sound field recording. The sound field reconstructed from the transcoded coefficients has a zone of accurate reconstruction which is prolonged towards the long axis of a prolate spheroidal microphone array.
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