摘要
在有线电视台前端采用数字信标插入器在视频插入标志,在有线电视网中对此标志进行检查,即可判断有线网络中播出的信号是否合法,若不符合设定,则通过电话网络向前端发出报警信号,前端收到报警信号后,向值班人员发出声光报警,从而达到对有线电视网络进行实时监控的目的。较详细地说明了该系统及各主要部分的原理及具体实现。
A Digital Flag Inserter is applied at CATV terminal as an earmark of video signals.To check the earmark in the CATV network,it can be decided whether or not an illegal signal has invaded the system.In case the inconsistency is monitored,an alerting signal is sent to CATV Front Terminal via a telephone line,that immediately alert the personnel on duty with both noise and flash signals,thereby,a real time monitoring on CATV is achieved. This paper specifies a principle of the technology and a way of how to bring it about.
出处
《中国民航学院学报》
2004年第6期39-43,共5页
Journal of Civil Aviation University of China
基金
中国民航学院与河北深州广播电视局合作项目.
