随着电视系统由传统的串行数字接口(Serial Digital Interface,SDI)架构逐渐向网际互连协议(Internet Protocol,IP)架构转变,网络时钟协议(Network Time Protocol,NTP)、精确时间协议(Precision Time Protocol,PTP)、实时传输协议(Real-time Transport Protocol,RTP)时间戳(Timestamp)、电影和电视工程师协会(The Society of Motion Picture and Television Engineers,SMPTE)ST 2059等信号取代了传统SDI架构中的黑场(Black Burst,BB)信号,成为IP化电视系统的设备同步、流同步信号.基于此,详细介绍PTP的同步原理、RTP数据包的重要数据格式、RTP时间戳在视音频流同步中的原理及SMPTE ST 2059的定义及相关应用.
Overview of Synchronization Technology of Television System in IP Era
As television systems gradually shift from the traditional Serial Digital Interface(SDI)architecture to the Internet Protocol(IP)architecture,the Network Time Protocol(NTP),Precision Time Protocol(PTP),Real-time Transport Protocol(RTP)Timestamp,The Society of Motion Picture and Television Engineers(Society of Motion Picture and Television Engineers(SMPTE)ST 2059,etc.,replace the Black Burst(BB)signal in the traditional SDI architecture,and become the device synchronization and stream synchronization signal of IP television system.Based on this,this paper introduces the synchronization principle of PTP,the important data format of RTP packets,the principle of RTP timestamp in video and audio stream synchronization,and the definition and related applications of SMPTE ST 2059.
Network Time Protocol(NTP)Precision Time Protocol(PTP)Real-time Transport Protocol(RTP)
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