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闭路电视,又称电缆电视,它能通过放象机或录象机,通过有线电缆等电子设备,自行播放出电视节目.它不受电视台播放时间的限制,随时随地都可收看到电视节目,适用于开展电化教育和丰富人民文化娱乐生活,目前已广泛应用于高等院校、工矿企业、饭店宾馆、列车、轮船等.闭路电视主要有播放中心、传输系统和接收系统组成,现分述如下.
Closed-circuit television, also known as cable television, which can play through television or video recorders, through cable and other electronic devices, to play their own TV shows. It is not subject to the limitations of television broadcast time anytime, anywhere can watch TV shows, It is widely used in colleges and universities, industrial and mining enterprises, hotels, trains, ships, etc. CCTV mainly includes playing center, transmission system and receiving system, which are described as follows .