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前言众所周知,在公众通信网中信号音(拨号音、回铃音、忙音)是由市话交换机产生的.移动电话接到公众网的信号音一般由市话交换机提供,有时需要由移动通信网内自己产生,尤其移动通信专用网更是如此.简化信号音电路是缩小移动电话设备体积的一个方面.本文介绍一种用于移动电话系统中的信号音电路.一、移动电话系统组网方式及信号音来源1.组网方式如图1所示.图1(a)是独立组成地区性、专业性通信网,不进入国家通信网(即公众通信网).图1(b)是经市话用户线进入国家通信网,成为市话用户的延伸.图1(c)是在中心站设立交换机的条件下,可经市话中继线进入国家通信网.
Preface As we all know, in the public communications network signal tone (dial tone, ring back tone, busy tone) is generated by the local exchange.Mobile phone connected to the public network signal tones generally provided by the local exchange, and sometimes by the mobile communication network This is especially true for mobile private networks, and simplifying the signal tone circuit is one aspect of reducing the volume of a mobile telephone device.This paper presents a signal tone circuit for use in a mobile telephone system.METHODS AND SIGNALS OF A MOBILE PHONE SYSTEM Tone source 1. Networking mode shown in Figure 1. Figure 1 (a) is a separate regional, professional communications network, do not enter the national communications network (ie, public communications network.) Figure 1 (b) Line into the national communications network, an extension of the local telephone users Figure 1 (c) is set up in the central station under the conditions of switches, trunk trunks can enter the national communications network.