Local Time-Domain Spherical Harmonic Spatial Encoding for Wave-Based Acoustic Simulation
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2019-04-01
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Language
en
Pages
5
617-621
617-621
Series
IEEE Signal Processing Letters, Volume 26, issue 4
Abstract
Volumetric time-domain simulation methods, such as the finite difference time domain method, allow for a fine-grained representation of the dynamics of the acoustic field. A key feature of such methods is complete access to the computed field, normally represented over a Cartesian grid. Simple solutions to the problem of extracting spatially encoded signals, necessary in virtual acoustics applications, result. In this letter, a simple time-domain representation of spatially encoded spherical harmonic signals is written directly in terms of spatial derivatives of the acoustic field at the receiver location. In a discrete setting, encoded signals may be obtained, at very low computational cost and latency, using local approximations with minimal number of grid points, and avoiding large convolutions and frequency-domain block processing of previous approaches. Numerical results illustrating receiver directivity and computed time-domain responses are presented, as well as numerical solution drift associated with repeated time integration.Description
Keywords
ambisonics, Finite difference time domain (FDTD), microphone array, room acoustics, spatial audio, spherical harmonics
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Citation
Bilbao, S, Politis, A & Hamilton, B 2019, ' Local Time-Domain Spherical Harmonic Spatial Encoding for Wave-Based Acoustic Simulation ', IEEE Signal Processing Letters, vol. 26, no. 4, 8656507, pp. 617-621 . https://doi.org/10.1109/LSP.2019.2902509
