Determination of Bit-Rate Adaptation Thresholds for the Opus Codec for VoIP Services - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2014

Determination of Bit-Rate Adaptation Thresholds for the Opus Codec for VoIP Services

Résumé

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.
Fichier principal
Vignette du fichier
han-iscc2014.pdf (880.96 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01009398 , version 1 (03-11-2017)

Identifiants

Citer

Yi Han, Damien Magoni, Patrick Mcdonagh, Liam Murphy. Determination of Bit-Rate Adaptation Thresholds for the Opus Codec for VoIP Services. IEEE International Symposium on Computers and Communications, Jun 2014, Madeira, Portugal. pp.1-7, ⟨10.1109/ISCC.2014.6912585⟩. ⟨hal-01009398⟩

Collections

CNRS
93 Consultations
1817 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More