信号音发生器.doc

题目：电话网信号音发生器的设计 学 院： 电子与电气工程学院 专 业： 电子科学与技术 姓 名： 指导教师： 2016年 3月 15日 摘 要 在打电话的过程中，我们常常会在电话里听到“嘟嘟嘟”的声音，但是有时候“嘟”的声音持续长短不一，而这种持续时间长短不一的声音，代表的也是不同的信息，这就是信号音。信号音是一种由交换机向用户终端发出的进程提示音，在各种交换机上都有着统一的标准，其中在电话网中的信号音主要有：拨号音，忙音，拥塞音，回铃音，空号音，长途通知音，振铃音和催挂音，不同的信号音，含义，结构和频率都有所不同。 论文首先阐述了研究信号音的背景及目的，讲解了各种信号音产生含义，结构，产生原理和电路图，然后介绍了基本设计思路。设计当中主要包括硬件电路的设计和测试各种信号音的程序设计，硬件设计电路中主要用到80C5-1单片机，DA转换器，喇叭的焊接。 论文最后介绍了对各种信号音在信号音发生器上的运行结果，结果表明该发生器对不同的信号音都有着不同的反馈，符合设计要求。 关键字：电话； 信号音； 单片机； 分频； 程控交换 ABSTRACT In the call of the process, we often hear toot toot the voice on the phone, but sometimes a beep sound continuously varying lengths, and the continuous sound of varying lengths of time, representative of the information is different. This is the signal tone. Sound signal is a process which is issued by the switch to the user terminal tone, has a unified standard in all switch, the signal tone in the telephone network is main: dial tone, busy tone, congestion tone, ring back tone, vacant tone, long-distance notification sound, ringing sound and howler tone, different tone, meaning, structure and frequency are different。 First of all, the paper expounds the significance and purpose of the study of the signal tone, explains the backgrounds, structure, generating principle and circuit diagram of the signals, and then introduces the basic design ideas. The design includes hardware circuit design and testing of various signal tone of the program design, hardware design circuit is mainly used in the MC5-1 single chip microcomputer, DA converter, AD converter, speaker of the welding. This paper introduces the various signal in the signal tone generator on the operating results, the results show that the signal generator of the sound different have different fe