论文部分内容阅读
本文系统地介绍了在ＣＡＴＶ网络中实现监警系统数据通信的原理。在简要介绍ＣＡＴＶ网络的双向传输技术基础上，提出上行、下行信号的传输方式，载频选取，通信链路结构以及调制和解调的具体方框图。其中对于系统采用的被动守候式通信方法的实现作了原理性的解释。同时还给出了本系统解调输出的波形图，从实验上验证了方案的可行性。
This article systematically introduces the principle of realizing the data communication of police surveillance system in CATV network. Based on the brief introduction of the two-way transmission technology of CATV network, a concrete block diagram of the uplink and downlink signal transmission modes, carrier frequency selection, communication link structure and modulation and demodulation is proposed. Which for the system passive pass-by-pass communication method to achieve the principle of interpretation. At the same time, the waveform of the demodulated output of the system is also given, which verifies the feasibility of the scheme experimentally.