Unified Comms

Efficient Quality-Based Playout Buffer Algorithm

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Executive Summary

Playout buffers are used in VoIP systems to compensate for network delay jitter by making a trade-off between delay and loss. In this paper the authors propose a playout buffer algorithm that makes the trade-off based on maximization of conversational speech quality, aiming to keep the computational complexity lowest possible. They model the network delay using a Pareto distribution and show that it is a good compromise between providing an appropriate fit to the network delay characteristics and yielding a low arithmetical complexity. They use the ITU-T E-Model as the quality model and simplify its delay impairment function.

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