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Ambisonic recording with spherical microphone arrays (SMAs) is based on a far-field assumption which determines how microphone signals are encoded into Ambisonic signals. In the presence of a near-field source, low-frequency distance-dependent boosts arise in SMAs in similar nature to proximity effects in far-field equalized directional microphones. In this study, the effects of near-field sources on Ambisonic signals are modelled analytically, their interaction with regularization stages is observed, and then traced further across to two basic ambisonic processing operations: virtual microphones, and binaural decoding.
Author (s): Gonzalez, Raimundo; Politis Archontis; Lokki, Tapio
Affiliation:
Aalto University, Espoo, Finland; Tampere University of Technology,Tampere, Finland
(See document for exact affiliation information.)
AES Convention: 151
Paper Number:10526
Publication Date:
2021-10-06
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Session subject:
Evaluation of spatial audio
Permalink: https://aes2.org/publications/elibrary-page/?id=21490
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Gonzalez, Raimundo; Politis Archontis; Lokki, Tapio; 2021; Effects of Near-field Sources on Ambisonics Recording and Playback [PDF]; Aalto University, Espoo, Finland; Tampere University of Technology,Tampere, Finland; Paper 10526; Available from: https://aes2.org/publications/elibrary-page/?id=21490
Gonzalez, Raimundo; Politis Archontis; Lokki, Tapio; Effects of Near-field Sources on Ambisonics Recording and Playback [PDF]; Aalto University, Espoo, Finland; Tampere University of Technology,Tampere, Finland; Paper 10526; 2021 Available: https://aes2.org/publications/elibrary-page/?id=21490