The Influence of Diffuse-Field Equalization on the Perception of Spatial Aliasing Introduced by Spherical Microphone Arrays

Salmon F, Berthomieu G, Palacino J, Paquier M. The Influence of Diffuse-Field Equalization on the Perception of Spatial Aliasing Introduced by Spherical Microphone Arrays. J Audio Eng Soc. 2024;72(10):650-663. doi:10.17743/jaes.2022.0157

@article{Salmon2024_22769,
  author = {Salmon, François and Berthomieu, Gauthier and Palacino, Julian and Paquier, Mathieu},
  title = {{The Influence of Diffuse-Field Equalization on the Perception of Spatial Aliasing Introduced by Spherical Microphone Arrays}},
  journal = {Journal of the Audio Engineering Society},
  volume = {72},
  number = {10},
  pages = {650--663},
  year = {2024},
  month = oct,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2022.0157},
  url = {https://doi.org/10.17743/jaes.2022.0157}
}

TY  - JOUR
TI  - The Influence of Diffuse-Field Equalization on the Perception of Spatial Aliasing Introduced by Spherical Microphone Arrays
AU  - Salmon, François
AU  - Berthomieu, Gauthier
AU  - Palacino, Julian
AU  - Paquier, Mathieu
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 72
IS  - 10
SP  - 650
EP  - 663
PY  - 2024
DA  - 2024/10/15
DO  - 10.17743/jaes.2022.0157
UR  - https://doi.org/10.17743/jaes.2022.0157
PB  - Audio Engineering Society
LA  - en
AB  - 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.
ER  -