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随着有线电视的发展,广播节目的来源越来越多,有开路发射信号、卫星转发节目、微波转发节目及本地自办节目等。覆盖距离越来越远,节目、信息共享,实现城市联网。有线电视已进入多频道、大覆盖区的高质量传输时期。今后还将发展数字广播节目、视频点播付费电视、双向综合通信业务、会议电视等多种宽带数字综合业务(B-ISDN),实现电视、电话、计算机三网合一的信息高速公路。
With the development of cable television, there are more and more sources of radio programs. There are open-circuit transmitting signals, satellite forwarding programs, microwave forwarding programs and local self-running programs. Farther and farther away from the coverage, programs, information sharing, urban networking. Cable has entered the multi-channel, large coverage area of high-quality transmission period. In the future, B-ISDN will be developed for digital broadcasting, video-on-demand and pay TV, two-way integrated communications and conference television, and an information superhighway that integrates television, telephone and computer networks.