Spherical Harmonic Decomposition of a Sound Field Based on Microphones Around the Circumference of a Human Head
Paper in proceeding, 2021

We present a method for decomposing a sound field into spherical harmonics (SH) based on observations of the sound field around the circumference of a human head. The method is based on the analytical solution for observations of the sound field along the equator of a rigid sphere that we presented recently. The present method incorporates a calibration stage in which the microphone signals for sound sources at a suitable set of calibration positions are projected onto the SH decomposition of the same sound field on the surface of a notional rigid sphere by means of a linear filtering operation. The filter coefficients are computed from the calibration data via a least-squares fit. We present an evaluation of the method based on binaural rendering of numerically simulated signals for an array of 18 microphones providing 8th SH order to demonstrate its effectiveness.

microphone array

augmented reality

spherical harmonics

Binaural rendering

Author

Jens Ahrens

Chalmers, Architecture and Civil Engineering, Applied Acoustics

Hannes Helmholz

Chalmers, Architecture and Civil Engineering, Applied Acoustics

David Lou Alon

Facebook Reality Labs

Sebastia V. Amengual Gari

Facebook Reality Labs

IEEE Workshop on Applications of Signal Processing to Audio and Acoustics

19311168 (ISSN) 19471629 (eISSN)

Vol. 2021-October 231-235
978-1-6654-4870-3 (ISBN)

IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA)
New Paltz, NY, USA,

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Media Engineering

DOI

10.1109/WASPAA52581.2021.9632751

More information

Latest update

4/5/2022 6