空间多媒体通信中音视频同步技术研究  

A Study on Audio-Video Synchronization in Space Multimedia Communication

作　　者：陈运德[1] 张灿[1,2] 陈德元[1] 

机构地区：[1]中国科学院研究生院,北京100049 [2]信息安全国家重点实验室,北京100049

出　　处：《计算机仿真》2010年第6期130-134,共5页Computer Simulation

基　　金：国家"863"计划项目(2007AA0Z297);国家自然科学基金项目(60773137)

摘　　要：空间多媒体通信具有丢包率高、传输时延长、抖动大、资源受限等特点。为满足音视频同步QoS要求,提出了一种基于RTP/RTCP协议的音视频实时同步算法,以音频流为主媒体流,通过控制视频播放实现音视频同步。该算法无需全网同步时钟与反馈机制,具有较低的算法复杂度,适用于空间多媒体通信。仿真实验结果表明,该同步算法有效提高了空间多媒体通信系统中的音视频媒体间同步性能,满足空间通信的音视频同步QoS性能要求。Space multimedia communication is characterized with high packet loss rate, large transmission delay jitter and resource -limited. In order to satisfy the Quality of Service （QoS） requirements of audio -video synchronization, an algorithm of audio - video synchronization based on RTP/RTCP is proposed. With audio as master media stream, the scheme regulates the playout of video sequence to synchronize the presentation of video sequence with audio sequence. The algorithm has low complexity, and it is applicable to space multimedia communication without the need of a global clock or feedback mechanism. Results of simulation experiments confirm that the proposed algorithm effectively improves the synchronization between audio and video, and it can satisfy the requirements of the QoS of audio -video synchronization for space communication users.

关 键 词：空间多媒体通信 音视频同步 实时传输协议/实时传输控制协议 

分 类 号：TN919.8[电子电信—通信与信息系统]