Microphone Array Geometries for Horizontal Spatial Audio Object Capture With Beamforming

Blanco Galindo M, Coleman P, Jackson PJB. Microphone Array Geometries for Horizontal Spatial Audio Object Capture With Beamforming. J Audio Eng Soc. 2020;68(5):324-337. doi:10.17743/jaes.2020.0025

@article{BlancoGalindo2020_20851,
  author = {Blanco Galindo, Miguel and Coleman, Philip and Jackson, Philip J. B.},
  title = {{Microphone Array Geometries for Horizontal Spatial Audio Object Capture With Beamforming}},
  journal = {Journal of the Audio Engineering Society},
  volume = {68},
  number = {5},
  pages = {324--337},
  year = {2020},
  month = may,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2020.0025},
  url = {https://doi.org/10.17743/jaes.2020.0025}
}

TY  - JOUR
TI  - Microphone Array Geometries for Horizontal Spatial Audio Object Capture With Beamforming
AU  - Blanco Galindo, Miguel
AU  - Coleman, Philip
AU  - Jackson, Philip J. B.
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 68
IS  - 5
SP  - 324
EP  - 337
PY  - 2020
DA  - 2020/05/06
DO  - 10.17743/jaes.2020.0025
UR  - https://doi.org/10.17743/jaes.2020.0025
PB  - Audio Engineering Society
LA  - en
AB  - Microphone array beamforming can be used to enhance and separate sound sources, with applications in the capture of object-based audio. Many beamforming methods have been proposed and assessed against each other. However, the effects of compact microphone array design on beamforming performance have not been studied for this kind of application. This study investigates how to maximize the quality of audio objects extracted from a horizontal sound field by filter-and-sum beamforming, through appropriate choice of microphone array design. Eight uniform geometrieswith practical constraints of a limited number of microphones and maximum array size are evaluated over a range of physical metrics. Results show that baffled circular arrays outperform the other geometries in terms of perceptually relevant frequency range, spatial resolution, directivity, and robustness. Moreover, a subjective evaluation of microphone arrays and beamformers is conducted with regards to the quality of the target sound, interference suppression, and overall quality of simulated music performance re- cordings. Baffled circular arrays achieve higher target quality and interference suppression than alternative geometries with wideband signals. Furthermore, subjective scores of beamformers regarding target quality and interference suppression agree well with beamformer on-axis and off-axis responses; with wideband signals, the superdirective beamformer achieves the highest overall quality.
ER  -