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When a sound field is sampled by a finite number of microphones, the upper-frequency range of the recorded content is affected by spatial aliasing. The frequency beyond which aliasing-induced artifacts occur is related to the distance between a microphone and its nearest neighbors. In this study, ambisonics signals of order N = 7 were encoded from simulated recordings made by virtual spherical microphone arrays of varying characteristics (radius, sampling scheme, and sampling grid order). A diffuse-field equalization, the role of which is to lessen the aliasing-induced spectral coloration, was also considered in the tested conditions. These aliased stimuli were then compared with unaliased stimuli of order N = 7. Results showed that the diffuse-field equalization had a great impact on the perceived differences. A perceptual threshold was calculated in order to determine whether aliasing artifacts are likely to be audible based on the amount of aliasing-induced encoding error.
Author (s): Salmon, François; Berthomieu, Gauthier; Palacino, Julian; Paquier, Mathieu
Affiliation:
Noise Makers, 3 Rue Brossay Saint-Marc, 35700 Rennes, France; University of Brest, CNRS, Lab-STICC UMR 6285, 6 avenue Victor Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France; Feichter Audio, Espace de Broglie, 5 Rue Louis de Broglie, 22300 Lannion, France
(See document for exact affiliation information.)
Publication Date:
2024-10-15
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Permalink: https://aes2.org/publications/elibrary-page/?id=22769
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Salmon, François; Berthomieu, Gauthier; Palacino, Julian; Paquier, Mathieu; 2024; The Influence of Diffuse-Field Equalization on the Perception of Spatial Aliasing Introduced by Spherical Microphone Arrays [PDF]; Noise Makers, 3 Rue Brossay Saint-Marc, 35700 Rennes, France; University of Brest, CNRS, Lab-STICC UMR 6285, 6 avenue Victor Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France; Feichter Audio, Espace de Broglie, 5 Rue Louis de Broglie, 22300 Lannion, France; Paper ; Available from: https://aes2.org/publications/elibrary-page/?id=22769
Salmon, François; Berthomieu, Gauthier; Palacino, Julian; Paquier, Mathieu; The Influence of Diffuse-Field Equalization on the Perception of Spatial Aliasing Introduced by Spherical Microphone Arrays [PDF]; Noise Makers, 3 Rue Brossay Saint-Marc, 35700 Rennes, France; University of Brest, CNRS, Lab-STICC UMR 6285, 6 avenue Victor Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France; Feichter Audio, Espace de Broglie, 5 Rue Louis de Broglie, 22300 Lannion, France; Paper ; 2024 Available: https://aes2.org/publications/elibrary-page/?id=22769
@article{salmon2024the,
author={salmon françois and berthomieu gauthier and palacino julian and paquier mathieu},
journal={journal of the audio engineering society},
title={the influence of diffuse-field equalization on the perception of spatial aliasing introduced by spherical microphone arrays},
year={2024},
volume={72},
issue={10},
pages={650-663},
month={november},}
TY – paper
TI – The Influence of Diffuse-Field Equalization on the Perception of Spatial Aliasing Introduced by Spherical Microphone Arrays
SP – 650 EP – 663
AU – Salmon, François
AU – Berthomieu, Gauthier
AU – Palacino, Julian
AU – Paquier, Mathieu
PY – 2024
JO – Journal of the Audio Engineering Society
VO – 72
IS – 10
Y1 – November 2024