基于数字多媒体广播的考场同步时钟设计

摘要

基于数字多媒体广播(DMB)技术,设计了一款LED数字同步时钟.该时钟可实时接收DMB信号,解码出时间基准,并驱动LED点阵屏显示,所有时钟同步误差不超过1 s.除显示时间外,还可作为考场DMB接收机的信息显示终端,提供信号强度、告警等提示.与传统考场时钟相比,成本更低,同步性更好,更容易管理和维护,为现代化考场建设提供了新的信息化同步时钟解决方案.%A asynchronous digital clock based on DMB (digital multimedia broadcasting) technology is designed.The clock receives DMB signal,decodes the time reference to calibrate the clock,and drives an LED panel for display.All clocks can be strictly synchronized with an error less than 1 second.In addition to time display,the designed clock can also be used as an information terminal for the DMB receivers installed in the examination room to indicate DMB signal strength and provide sound notification.Compared to the traditional solution,this design advances in lower cost,better synchronization performance,and is easier to manage and maintain.It provides a new method of intelligent simultaneous clock solution for the modern examination rooms.