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.

Author: Ema Souza Blanes, Carlos Tejeda-Ocampo and Sunil Bharitkar
AES Convention: 153 (October 2022) Paper Number: 10633
Publication Date: October 19, 2022
Subject: Spatial Audio

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