基于时延范围预测的媒体播放控制算法  

Delay boundary prediction based playout control schemefor media synchronization

作　　者：吴炜[1] 常义林[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2005年第2期272-275,共4页Journal of Xidian University

基　　金：高等学校博士学科点专项科研基金资助项目(20010701006);综合业务网国家重点实验室和华为基金资助项目

摘　　要：在分组多媒体通信中,根据Chebyshev不等式和时延抖动的统计特性,预测分组的网络时延范围,在时延范围预测的基础上提出一种适用于实时分组语音通信的媒体播放控制算法.该算法记录先前到达分组的网络时延,用它们对当前的播放时延作短期预测,并根据播放时延的估计调整每个突发期中分组的播放时刻.实验结果表明该算法可以自适应地跟踪网络时延的变化,较大程度上降低播放时延,使得迟到分组的比值保持在1%左右.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.

关 键 词：时延抖动 媒体同步 分组语音通信 

分 类 号：TN915.01[电子电信—通信与信息系统]