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一、前言近十年来,民用无线通讯技术在我国国民经济各部门的应用取得了迅速的发展。从开始的点对点通讯发展到各种通讯网络,乃至自动无线电话系统。为了有效地利用无线信道,在发展无线电话机的同时发展了各种类型的选择呼叫设备及自动拨号系统。目前,地址码大多采用下列两种制度:一种为脉冲数字码,另一种是音频数字码。
I. Introduction In the recent ten years, the application of civil wireless communication technology has rapidly developed in various sectors of our national economy. From the beginning of peer-to-peer communications to the development of various communications networks, and even automated wireless telephone systems. In order to effectively utilize the wireless channel, various types of selective call devices and automatic dialing systems have been developed while developing radiotelephones. At present, most of the address codes use the following two systems: one is a pulse digital code and the other is an audio digital code.