NDLI: Determination of bit-rate adaptation thresholds for the Opus codec for VoIP services

Content Provider	IEEE Xplore Digital Library
Author	Yi Han Magoni, D. McDonagh, P. Murphy, L.
Copyright Year	2014
Description	Author affiliation: LaBRI, Univ. of Bordeaux, Talence, France (Magoni, D.) \|\| Sch. of Comput. Sci. & Inf., Univ. Coll. Dublin, Dublin, Ireland (Yi Han; Murphy, L.) \|\| Lero, Dublin City Univ., Dublin, Ireland (McDonagh, P.)
Abstract	In this paper, we present an experimental evaluation of the recently standardized Opus codec used in a VoIP context. Opus operates in both narrow and wideband modes, similar to Adaptive Multi-Rate (AMR). Through the use of the Wideband Perceptual Evaluation of Speech Quality (WB-PESQ) metric, we have conducted an extensive set of experiments using multiple audio samples encoded at different bit-rates, to investigate the impact of packet loss on resulting speech quality. Using these results, fitting functions for each bit-rate were computed to provide a straightforward manner of evaluating speech quality when given a specified packet loss rate. Using ns-2, a simulation analysis was conducted to evaluate the effect of background traffic on transmitted Opus streams. We observed that, when using different levels of background traffic, the observed packet loss rates varied heavily depending on the stream bit-rate. By correlating this information with the fitting functions derived previously, we were able to define switching thresholds. These are points where the speech quality of a lower bit-rate stream is greater than that of a higher bit-rate stream for the same levels of link bandwidth saturation.
Starting Page	1
Ending Page	7
File Size	916921
Page Count	7
File Format	PDF
ISBN	9781479942770
DOI	10.1109/ISCC.2014.6912585
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-23
Publisher Place	Portugal
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Packet loss Codecs Speech Degradation Wideband Delays
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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