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 mainly affected by IP network impairments such as delay, jitter and packet loss. Adaptive smoothing buffer at the receiving end can compensate for the effects of jitter based on a tradeoff between delay and loss to archive a best voice quality. This work formulates an online loss model which incorporates buffer sizes and applies the ITU-T E-model approach to optimize the delay-loss problem. 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 based on silence skipping to prevent unacceptable increase in the buffer preloading delay and even buffer overflow. Simulation experiments validate that the proposed adaptive smoother archives significant improvement in the voice quality.