Spatial Filter Bank Design in the Spherical Harmonic Domain
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A4 Artikkeli konferenssijulkaisussa
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Date
2021-12
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en
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5
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29th European Signal Processing Conference, EUSIPCO 2021, pp. 106 - 110, European Signal Processing Conference
Abstract
A fairly recent development in spatial audio is the concept of dividing a spherical sound field into several directionally-constrained regions, or sectors. Therefore, the sphere is spatially partitioned into components that should ideally reconstruct the unit sphere. When distributing such sectors uniformly on the sphere, their set makes up a bank of spatial filters, i. e. a spatial filter bank. These sectors can be conveniently designed in the spherical harmonic domain such that each sector preserves the local properties of the acoustic energy-density. These traits have enabled recent improvements in the parameterization of higher-order Ambisonics, e. g. for spatial audio reproduction, multi-source analysis, and sound field visualization. However, when using a set of these sectors as a spatial filter bank, their spatial interaction incurs a scaling error if the reconstructed sound field is not properly compensated. This paper presents the methodology for designing a set of spatial filters in the spherical harmonic domain, which uniformly partition the sphere. Furthermore, a new corresponding compensation factor is derived enabling amplitude or energy preservation of the input sound field. This allows the implementation of a novel spatial filter bank in the spherical harmonic domain.Description
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Hold, C, Politis, A, McCormack, L & Pulkki, V 2021, Spatial Filter Bank Design in the Spherical Harmonic Domain . in 29th European Signal Processing Conference, EUSIPCO 2021 . European Signal Processing Conference, IEEE, pp. 106 - 110, European Signal Processing Conference, Dublin, Ireland, 23/08/2021 . https://doi.org/10.23919/EUSIPCO54536.2021.9616091