Home // International Journal On Advances in Telecommunications, volume 7, numbers 1 and 2, 2014 // View article

A No-reference Voice Quality Estimation Method for Opus-based VoIP Services

Authors:
Peter Orosz
Tamas Skopko
Zoltan Nagy
Tamas Lukovics

Keywords: Opus codec; real-time voice; QoE; QoE estimation; QoS-QoE correlation

Abstract:
By the emergence of real time media applications, correlating users' satisfaction with measured service quality is a constant challenge. Accordingly, this area was under intensive research in the last decade. Finding the correlation among Quality of Experience (QoE) for voice, measured Quality of Service (QoS) parameters in the network, and objective voice performance metrics is a key task. Most of the voice metrics use the reference content to compare the quality of the received stream. In contrast, this paper introduces a mathematical low-complexity, no-reference method that performs real-time estimation of QoE for Opus-based voice services. To determine the estimator function, we performed combined (subjective and objective) assessments to build a reference data set of 3-tuples of MOS, jitter and loss values. Applying polynomial regression, we used the reference data set to search a low-degree two-variable polynomial to hash objective QoS metrics (jitter and loss) to the subjective MOS score of the service quality. In the final phase of our investigation, we were evaluated the performance of the polynomials with a set of four audio clips.

Pages: 12 to 21

Copyright: Copyright (c) to authors, 2014. Used with permission.

Publication date: June 30, 2014

Published in: journal

ISSN: 1942-2601