Spherical Harmonic Decomposition of a Sound Field Based on Microphones Around the Circumference of a Human Head
Paper i 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

Författare

Jens Ahrens

Chalmers, Arkitektur och samhällsbyggnadsteknik, Teknisk akustik

Hannes Helmholz

Chalmers, Arkitektur och samhällsbyggnadsteknik, Teknisk akustik

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,

Styrkeområden

Informations- och kommunikationsteknik

Ämneskategorier

Telekommunikation

Mediateknik

DOI

10.1109/WASPAA52581.2021.9632751

Mer information

Senast uppdaterat

2022-04-05