关键词: 时延抖动, 媒体同步, 分组语音通信

Abstract: This paper utilizes the Chebychev inequality and statistic characteristics of the jitter to predict the network delay boundary of packet transmission in packet multimedia communication. Furthermore this paper proposes a playout control scheme for real-time packet audio communication, which makes short-term prediction about current playout delay according to the historical trace of network delay. Based on the prediction, playout times of packets in each talkspurt are determined. Experimental results show that the proposed scheme can adaptively follow the changes of network delay and produce significant reductions in playout delay at the expense of about 1％ late packet ratios.

Key words: delay jitter, media synchronization, packet audio communication