基于数字多媒体广播的考场同步时钟设计
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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.
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.
引文
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[8]ETSI EN 300401 v1.4.1.Radio Broadcasting Systems:Digital Audio BroadcastingRadio Broadcasting Systems;Digital Audio Broadcasting(DAB)to mobile,portable and fixed receivers[S].2006.
[9]ETSI TS 102 427 V1.1.1.Digital Audio Broadcasting(DAB);Data Broadcasting-MPEG-2 TS streaming[S].2005.
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[13]葛超,张景春,孙艳彬,等.基于ARM嵌入式系统的LED点阵屏设计[J].液晶与显示,2010,25(5):743-746.
[14]黄桂梅,刘永立.小型LED点阵屏实用软件设计与实现[J].计算机测量与控制,2011,19(12):3165-3168.
[2]巫玲坚,鲍贤勇,李北.钟表行业时间同步技术标准体系研究[J].中国标准化,2014(2):51-54.
[3]董立军,周杰.基于PIC单片机的电波数码显示时钟的设计[J].微计算机信息,2006,22(8):109-112.
[4]纪龙蛰,单庆晓,林明.卫星同步时钟系统在大规模考试时间监控中的应用[J].中国考试,2012(10):37-40.
[5]谢志平,罗金凤.基于GPS自动授时的无线智能控制器的设计[J].电子产品世界,2014(12):49-52.
[6]窦强,蔡欣荣.基于北斗、短波的高精度时钟系统研究与设计[J].指挥控制与仿真,2013,35(6):130-133.
[7]陈谣.基于GPS校时的CET考试专用时钟设计[J].电子世界,2016(1):109-110.
[8]ETSI EN 300401 v1.4.1.Radio Broadcasting Systems:Digital Audio BroadcastingRadio Broadcasting Systems;Digital Audio Broadcasting(DAB)to mobile,portable and fixed receivers[S].2006.
[9]ETSI TS 102 427 V1.1.1.Digital Audio Broadcasting(DAB);Data Broadcasting-MPEG-2 TS streaming[S].2005.
[10]王国裕,张红升,陆明莹.我国数字广播的发展方向[J].科学通报,2014(23):2320-2327.
[11]文惠.发展中的DAB、DAB+与DMB广播[J].无线电与电视,2008(11):9-15.
[12]张超,顾晓峰,陆明莹,等.基于VC的T-DMB编码器的研究与实现[J].重庆邮电大学学报(自然科学版),2011,23(2):161-166.
[13]葛超,张景春,孙艳彬,等.基于ARM嵌入式系统的LED点阵屏设计[J].液晶与显示,2010,25(5):743-746.
[14]黄桂梅,刘永立.小型LED点阵屏实用软件设计与实现[J].计算机测量与控制,2011,19(12):3165-3168.