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.
https://www.aes.org/e-lib/browse.cfm?elib=21962
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.
Learn more about the AES E-Library
Start a discussion about this Spatial Audio!
