基于Internet交互系统引入微分环的多媒体同步方法  

Differentiator Method for Multimedia Synchronization in Interaction System over the Internet

作　　者：田友胜[1] 侯义斌[1] 钱屹[1] 陈亚滨[1] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049

出　　处：《西安交通大学学报》2002年第10期1058-1061,共4页Journal of Xi'an Jiaotong University

摘　　要：针对交互系统多媒体同步中存在的问题 ,提出了引入预测环节的多媒体同步方法 .采用控制论方法 ,将交互系统的多媒体信息传输与回放过程作为一个系统进行分析 ,得出发送缓冲和接收缓冲是惯性环节、网络传输是迟滞环节 ,各环节都存在一定的相角滞后 .媒体信息预测是一个微分环节 ,可引入一定的相角超前 ,将这种预测环节引入到多媒体同步系统中 ,对系统进行超前校正 ,可改善系统的实时性能 ,减小网络延迟抖动对多媒体同步的影响 .仿真结果证明了预测环节在克服网络延迟抖动的影响、提高交互系统的实时性。According to the interaction system's real time requirements, prognostication is introduced into multimedia synchronization method. Adopting the cybernetics method, multimedia information transmission and playback process as a whole system are analyzed. Sender buffer and receiver buffer are inertia links, and network transformation is hysteretic link, each of them has a phase lag. Multimedia information prognostication is a differential link and has a phase forward. Multimedia information prognostication is introduced into multimedia synchronization system to revise the phase lag and improve the real time capability. The simulations have educed these results that the multimedia information playback delay becomes shorter, and the multimedia synchronization effects are improved.

关 键 词：INTERNET 交互系统 微分环 多媒体同步 控制论 网络传输延迟 网络通信 

分 类 号：TP393.4[自动化与计算机技术—计算机应用技术]