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目前国内的有线电视广播网是属于点与多点间的单向电视信息传输。即在每天规定的时间,一个城市的有线电视台与多个区电视台之间、每一个区台与其所辖多个街道电视点之间以及每一街道电视点与其所辖众多用户之间,都是利用点与多点间的单向电视传输;经过这样三极的点与多点间传输而达到广播目的,即形成完整的有线电视广播网。用户在规定时间内不论是否需要收看电视节目,线路上总是传来电视节目信号,用户如欲收看任一电视节目,则要拨动选择开关,选看所需节目。多频道电视信号是
At present, the domestic CATV network belongs to the one-way television information transmission between points and points. That is, at a prescribed time every day, between a city’s cable television station and a plurality of district television stations, between each district station and a plurality of street television stations under its jurisdiction, and between each street television point and many users under its jurisdiction, Use point and multi-point one-way television transmission; through such a three-pole point and multi-point transmission to achieve the purpose of broadcasting, that is, a complete cable television network. Users within a specified period of time whether or not you need to watch TV shows, always on the line TV programs, users want to watch any TV shows, you have to dial the selector switch, select the desired program. Multi-channel TV signal is