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Research Article
A perceptual quality model intended for adaptive VoIP applications†
Article first published online: 14 NOV 2005
DOI: 10.1002/dac.755
Copyright © 2005 John Wiley & Sons, Ltd.
Additional Information
How to Cite
Hoene, C., Karl, H. and Wolisz, A. (2006), A perceptual quality model intended for adaptive VoIP applications. Int. J. Commun. Syst., 19: 299–316. doi: 10.1002/dac.755
- †
Publication History
- Issue published online: 3 MAR 2006
- Article first published online: 14 NOV 2005
- Manuscript Accepted: 8 JUN 2005
- Manuscript Revised: 2 JUN 2005
- Manuscript Received: 30 SEP 2004
Funded by
- Deutsche Forschungsgemeinschaft
- Abstract
- References
- Cited By
Keywords:
- Internet telephony;
- adaptive transmission;
- perceptual quality model;
- E-model;
- PESQ;
- packetization;
- delay spikes
Abstract
Quality models predict the perceptual quality of services as they calculate subjective ratings from measured parameters. In this article, we present a new quality model that evaluates Voice over IP (VoIP) telephone calls. In addition to packet loss rate, coding mode and delay, it takes into account the impairments due to changes in the transmission configuration (e.g. switching the coding mode or re-scheduling the playout time). Moreover, this model can be used at run time to control the transmission of such calls. It is also computationally efficient and open source.
To demonstrate the potential of our model, we apply it to select the ideal coding and packet rate in bandwidth-limited environments. Furthermore, we decide, based on model predictions, whether to delay the playout of speech frames after delay spikes. Delay spikes often occur after congestion and cause packets to arrive too late. We show a considerable improvement in perceptual speech quality if our model is applied to control VoIP transmissions. Copyright © 2005 John Wiley & Sons, Ltd.