A Closer Look on Bitrate Requirements for Opus with First Order Ambisonics and AllRAD rendering to 5.1 and 7.1.4

Ema Souza Blanes CTOASB. A Closer Look on Bitrate Requirements for Opus with First Order Ambisonics and AllRAD rendering to 5.1 and 7.1.4. In: AES Convention 153. Audio Engineering Society; 2022. Paper 10633. Available from: https://aes.org/publications/elibrary-page/?id=21962

@inproceedings{EmaSouzaBlanes2022_21962,
  author = {Ema Souza Blanes, Carlos Tejeda-Ocampo and Sunil Bharitkar},
  title = {{A Closer Look on Bitrate Requirements for Opus with First Order Ambisonics and AllRAD rendering to 5.1 and 7.1.4}},
  booktitle = {AES Convention 153},
  note = {Paper 10633},
  year = {2022},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=21962}
}

TY  - CPAPER
TI  - A Closer Look on Bitrate Requirements for Opus with First Order Ambisonics and AllRAD rendering to 5.1 and 7.1.4
AU  - Ema Souza Blanes, Carlos Tejeda-Ocampo and Sunil Bharitkar
T2  - AES Convention 153
M1  - Paper 10633
PY  - 2022
DA  - 2022/10/06
UR  - https://aes.org/publications/elibrary-page/?id=21962
PB  - Audio Engineering Society
LA  - en
AB  - In a previous study, transparency bitrates were found for Opus compression of Ambisonics content for the second and third order cases, but results were inconclusive for the first order. In this paper, we take a closer look on Basic Audio Quality of first order native Ambisonic content compressed with the Opus audio codec at 24, 32 and 48 kbps bitrates per channel. We present the results of a MUSHRA subjective test for Ambisonics in Opus decoded to ITU-R BS.2051-2 speaker layouts (viz., 5.1 and 7.1.4) using IEM AllRAD decoder. Results revealed that for music content, transparency can be achieve between 32 and 48 kbps per channel. However, 64 kbps per channel seems to be more suited for ambient content.
ER  -