The increasing popularity of Ambisonics as a spatial audio format for streaming services poses new challenges to existing audio coding techniques. This paper seeks to evaluate timbral distortion and localization accuracy of Ambisonic audio encoded using Opus low-bitrate compression. The study was conducted for 1st, 3rd and 5thorder Ambisonic signals at various bitrates reproduced over a 50-channel spherical loudspeaker configuration. This study has identified how lower bitrates reduce timbral fidelity, though this changes depending on the audio content. Localization accuracy has been found to be relatively robust even at very low bitrates. The results suggest that the user experience of spatial audio streaming services would significantly improve if 3rd order Ambisonics would be implemented over 1st order.
|Publication status||Published - Mar 2019|
|Event||2019 AES International Conference on Immersive and Interactive Audio: Creating the Next Dimension of Sound Experience - York, United Kingdom|
Duration: 27 Mar 2019 → 29 Mar 2019
|Conference||2019 AES International Conference on Immersive and Interactive Audio: Creating the Next Dimension of Sound Experience|
|Period||27/03/19 → 29/03/19|
Bibliographical noteFunding Information:
The authors gratefully acknowledge the participation of the listening test subjects. This research was supported by Google.
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