Ambisonic synthesis of directional sources using non-spherical loudspeaker arrays

Treviño J, Iwaya Y, Suzukim Y, Okamoto T. Ambisonic synthesis of directional sources using non-spherical loudspeaker arrays. In: AES Conference: UK 25th Conference: Spatial Audio in Today’s 3D World. Audio Engineering Society; 2012. Paper 10. Available from: https://aes.org/publications/elibrary-page/?id=18117

@inproceedings{Trevino2012_18117,
  author = {Treviño, Jorge and Iwaya, Yukio and Suzukim, Yôiti and Okamoto, Takuma},
  title = {{Ambisonic synthesis of directional sources using non-spherical loudspeaker arrays}},
  booktitle = {AES Conference: UK 25th Conference: Spatial Audio in Today’s 3D World},
  note = {Paper 10},
  year = {2012},
  month = mar,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=18117}
}

TY  - CPAPER
TI  - Ambisonic synthesis of directional sources using non-spherical loudspeaker arrays
AU  - Treviño, Jorge
AU  - Iwaya, Yukio
AU  - Suzukim, Yôiti
AU  - Okamoto, Takuma
T2  - AES Conference: UK 25th Conference: Spatial Audio in Today’s 3D World
M1  - Paper 10
PY  - 2012
DA  - 2012/03/06
UR  - https://aes.org/publications/elibrary-page/?id=18117
PB  - Audio Engineering Society
LA  - en
AB  - Ambisonics has been touted as a system-independent technique to reproduce and synthesize arbitrary sound fields. It offers several advantages over other technologies, including the potential for compact recording systems and a scalable encoding scheme that focuses on the spatial features of the sound field while omitting the peculiarities of recording and reproduction systems. To date, however, most research surrounding the reproduction of Ambisonics has relied on the assumption of a fairly regular loudspeaker array where all transducers are equidistant to the listener. Mainstream deployment of Ambisonics requires weaker constraints on the reproduction array. Previously, we have introduced a new approach to decode Ambisonic data for reproduction over arrays with irregular angular spacing between loudspeakers. We now extend our proposal with near-field corrections for each loudspeaker. Unlike previous approaches [J. Daniel, 2003], our proposal considers per-loudspeaker near-field corrections in the decoder design stage; this allows us to precisely reproduce Ambisonic-encoded sound fields over non-spherical arrays. Furthermore, the proper treatment of near-field effects makes it possible to re-create sources exhibiting complex directivity patterns. We evaluated our proposal using a 157-channel, irregular loudspeaker array covering the walls and ceiling of a rectangular room to synthesize directional sound sources encoded using fifth-order Ambisonics.
ER  -