一种改进的基于时间戳的空间音视频同步方法  

An improved audio-video synchronization method based on timestamp

作　　者：薛彬[1] 徐京[1] 王猛[1] 

机构地区：[1]中国空间技术研究院航天恒星科技有限公司

出　　处：《电子设计工程》2013年第11期88-90,93,共4页Electronic Design Engineering

摘　　要：空间多媒体通信过程中存在的不可预测的分组数据丢失、乱序,可变的链路传输及处理时延抖动以及收发端时钟不同步与漂移等问题,这可能导致接收端在对音视频数据进行显示播放时产生音视频不同步现象。为了解决此问题,提出了一种改进的基于时间戳的空间音视频同步方法,该方法采用一种相对时间戳映射模型,结合接收端同步检测和缓冲设计,能够在无需全网时钟和反馈通道的情况下,实现空间通信中的音视频同步传输,并在接收端进行同步播放显示。对该方法进行了仿真,结果表明了设计的可行性。同步前的均方根误差SPD值平均在150 ms左右,最大能达到176.1 ms。文中方法能将SPD值控制在60 ms左右,不仅能实现音视频同步传输,并且开销很小,可应用在空间多媒体通信中。The problems occur in space muti-media communications such as unpredictalble loss or disorder of packet, variable link-transmission, delay jitter-processing, asynchronization and drift occur in sending-receiving end＇s clock, may lead asynchronization between audio and video displayed by receiving end. For resolving this problem, this paper provides an improved audio-video synchronization solution method based on timestamp. This method adopts a relative timestamp-mapping model combined with synchronous detection and buffer design in receive end ,which can realize transmission of audio-video synchronization in space communications without global net-clock and feedback channe and synchronous playback on receive end. Simulated results show the feasibility of the proposed method. The average result of SPD before synchronization is 150 ms, and max can reach 176.1 ms. The method provided by this paper can make the result of RMSE with in 60 ms, Generally, the method can make sure transmission of audio-video synchronization with a little cost. It can be applied in space muti-media communications.

关 键 词：音视频同步 空间多媒体通信 SPD 时间戳同步 

分 类 号：TP919.8[自动化与计算机技术]