This paper analyzes the necessity of the measurement of one-way delay, and it also points out the errors caused by the time offset between measurement devices. Then we propose an algorithm to estimate time offset betw...This paper analyzes the necessity of the measurement of one-way delay, and it also points out the errors caused by the time offset between measurement devices. Then we propose an algorithm to estimate time offset between measurement devices in network. With the estimated time offset, we can correct our measuring results. Simulation shows the effectiveness of our algorithm.展开更多
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-...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。展开更多
文摘This paper analyzes the necessity of the measurement of one-way delay, and it also points out the errors caused by the time offset between measurement devices. Then we propose an algorithm to estimate time offset between measurement devices in network. With the estimated time offset, we can correct our measuring results. Simulation shows the effectiveness of our algorithm.
文摘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。
