Parametric Ambisonic Encoding of Arbitrary Microphone Arrays
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2022
Department
Major/Subject
Mcode
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Language
en
Pages
14
2062-2075
2062-2075
Series
IEEE/ACM Transactions on Audio Speech and Language Processing, Volume 30
Abstract
This article proposes a parametric signal-dependent method for the task of encoding microphone array signals into Ambisonic signals. The proposed method is presented and evaluated in the context of encoding a simulated seven-sensor microphone array, which is mounted on an augmented reality headset device. Given the inherent flexibility of the Ambisonics format, and its popularity within the context of such devices, this array configuration represents a potential future use case for Ambisonic recording. However, due to its irregular geometry and non-uniform sensor placement, conventional signal-independent Ambisonic encoding is particularly limited. The primary aims of the proposed method are to obtain Ambisonic signals over a wider frequency band-width, and at a higher spatial resolution, than would otherwise be possible through conventional signal-independent encoding. The proposed method is based on a multi-source sound-field model and employs spatial filtering to divide the captured sound-field into its individual source and directional ambient components, which are subsequently encoded into the Ambisonics format at an arbitrary order. It is demonstrated through both objective and perceptual evaluations that the proposed parametric method outperforms conventional signal-independent encoding in the majority of cases.Description
Funding Information: Thisworkwas supported by the Aalto University Doctoral School of Electrical Engineering. Publisher Copyright: Author
Keywords
ambisonic encoding, Array signal processing, Decoding, Encoding, Geometry, Measurement, microphone array processing, Microphone arrays, parametric spatial audio, Recording
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Citation
McCormack, L, Politis, A, Gonzalez, R, Lokki, T & Pulkki, V 2022, ' Parametric Ambisonic Encoding of Arbitrary Microphone Arrays ', IEEE/ACM Transactions on Audio Speech and Language Processing, vol. 30, pp. 2062-2075 . https://doi.org/10.1109/TASLP.2022.3182857
