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Related Experiment Video

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A Method to Study Adaptation to Left-Right Reversed Audition

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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.

JASA Express Letters

|September 26, 2022

Summary

Spheroidal ambisonics, a new spatial audio method using spheroidal microphone arrays, is introduced. It offers compatibility with existing systems and improves sound field reconstruction accuracy along the array

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Area of Science:

Acoustics
Signal Processing
Spatial Audio

Background:

Ambisonics utilizes spherical harmonics for spatial sound field capture and reproduction.
Existing ambisonics frameworks are primarily designed for spherical microphone arrays.

Purpose of the Study:

To propose spheroidal ambisonics, a generalization of ambisonics for spheroidal microphone arrays.
To ensure compatibility between spheroidal and spherical ambisonics.
To enhance spatial sound field recording accuracy.

Main Methods:

Derivation of analytical conversions between spheroidal and spherical ambisonics.
Implementation of spheroidal ambisonics encoding and transcoding.
Numerical experiments for verification of the proposed methods.

Main Results:

Successful analytical conversion from spheroidal to spherical ambisonics.
Verification of encoding and transcoding processes for spatial sound field recording.
Demonstration of an extended zone of accurate sound field reconstruction along the prolate spheroidal array's long axis.

Conclusions:

Spheroidal ambisonics provides a viable framework for spatial audio capture with spheroidal microphone arrays.
The derived conversions ensure seamless integration with the current ambisonics ecosystem.
This generalization extends the applicability and accuracy of spatial audio technologies.