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1.2 COMPUTER AND INFORMATION SCIENCE, Computer Sciences
Users of audio-visual streaming services expect an ever in- creasing quality of experience. Channel bandwidth remains a bottleneck commonly addressed with lossy compression schemes for both the video and audio streams. Anecdotal evidence suggests a strongly perceived link between bit rate and quality. This paper presents three audio quality listen- ing experiments using the ITU MUSHRA methodology to assess a number of audio codecs typically used by stream- ing services. They were assessed for a range of bit rates using three presentation modes: consumer and studio qual- ity headphones and loudspeakers. Our results indicate that with consumer quality headphones, listeners were not dif- ferentiating between codecs with bit rates greater than 48 kb/s (p>=0.228). For studio quality headphones and loud- speakers aac-lc at 128 kb/s and higher was dierentiated over other codecs (p<=0.001). The results provide insights into quality of experience that will guide future development of objective audio quality metrics.
Hines, A. et al. (2014) Perceived Audio Quality for Streaming Stereo Music, MM 2014 - Proceedings of the 2014 ACM Conference on Multimedia, Orlando, Florida, 3-7 November.