西北大学学报(自然科学版)

<正> 作为一个将信号送人各家各户的闭路电视系统,其功能不应该只是单一的传输电视信号,而且还应该能够传输通信信号,以增加闭路电视系统的功能,根据现行闭路电视系统特点,本文主要提出增加传呼功能的方案并论证了实现双向通信及家庭报警的可行性。现行闭路电视系统一般都由接收、混频、二次发射(前端放大)、传输线传输、中继

We have studied in this paper how to introduce the call function into a Community Antenna TV System(CATVS).By the combination of improvement in receiving ability of user's TV set with communicative capability, the CATVS becomes a multifunctional body, which paves the way for further exploitation and use of CATVS.Our emphases are put on both the realization of one directional call and the possibility of two-direetional communication in a CATVS.