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Communication engineering and systems
Delay and packet loss dramatically affect the quality of a voice-over-IP (VoIP) call and depend on the playout buffer scheme implemented at the receiver. The choice of playout algorithm can’t be based on statistical metrics without considering the perceived end-to-end conversational speech quality. The authors present a method for evaluating various playout algorithms that extends the Emodel concept by estimating user satisfaction from time-varying transmission impairments. This article evaluates several playout algorithms and shows a correspondence between their results and those obtained via statistical loss and delay metrics.
Narbutt, M., Kelly, A., Murphy, L. & Perry, P. (2005) Adaptive VoIP Playout Scheduling: Assessing User Satisfaction. Internet Computing, IEEE, Volume 9, Issue 4, pp. 28-34. doi:10.1109/MIC.2005.72