Voice over IP performance monitoring
ACM SIGCOMM Computer Communication Review
An Algorithm for Playout of Packet Voice Based on Adaptive Adjustment of Talkspurt Silence Periods
LCN '99 Proceedings of the 24th Annual IEEE Conference on Local Computer Networks
An adaptive predictor for media playout buffering
ICASSP '99 Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 06
Adaptive playout scheduling using time-scale modification in packet voice communications
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 03
Intelligent voice smoother for silence-suppressed voice over Internet
IEEE Journal on Selected Areas in Communications
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Perceived voice quality is a key metric for VoIP applications. It is mainly affected by IP network impairments such as delay, jitter and packet loss. Adaptive smoothing algorithms are capable of adjusting dynamically the smoothing size by introducing a variable delay based on the network delay and loss parameters to archive the best voice quality. This work formulates an online loss model which incorporates buffer sizes and introduces an efficient and feasible perceived quality method for buffer optimization. Distinct from the other optimal smoothers, the proposed optimal smoother suitable for most of codecs carries the lowest complexity. Since the adaptive smoothing scheme introduces variable playback delays, the buffer re-synchronization between the capture and the playback becomes essential. This work also presents a buffer re-synchronization algorithm to prevent unacceptable increase in the buffer overflow. Simulation experiments validate that the proposed adaptive smoother archives significant improvement in the voice quality.