基于51的来电显示记录器

范文编号:TX202 附开题报告,任务书,外文翻译,原理图及PCB,程序,范文字数:17222,页数:31

摘  要

本文主要介绍了一种以单片机AT89S51和双音多频解码集成电路MT8870为核心的来电显示记录器，通过电话机输入被叫号码拨打记录器模拟电话网络,在液晶上显示所拨打的电话号码,同时将主叫号码写入到EEPROM,通过RS232传输到PC机中。该系统实用,方便查询。如果用户开通了来电显示业务,在本系统基础上,对电信来电显示数据包进行分析,可以将用户电话进一步扩展成来电显示电话。此外还可以用来扩展家用电器的局域控制,可以广泛的应用于家用电器或者其它场所的各种控制设备。
系统程序用c语言编写，并固化在 AT89S51内。本文给出了系统的各部分硬件结构及其实现的功能: DTMF编解码电路完成多音双频信号的解码与信号音检测；液晶显示电路用来显示当前查看的号码和号码的总数；EEPROM存储电路保存最多10个电话记录；RS232串口通信电路将主叫号码传输到PC机。另外还有PC机上软件界面的编写。本系统设计简单，成本低，组织灵活,可扩展性强。经试用效果良好，能够实现预定的功能。

关键词：双音频；来电显示；串口通信；EEPROM

Abstract

    This article mainly introduces a telephone with caller ID recorder whose cores are single - chip computer AT89S51 and dual - tone multifrequency decoding integrated circuit MT8870, which simulates the telephone network through dailing the recoder with the telephone, displays dialed number on the LED, meanwhile writes the calling number into EEPROM and transmits it into personal computer through RS232.The system is practical and convenient to inquiry. If the user has the telephone with caller ID service, on the basis of this system, he or she can expand his telephone into telephone with caller ID through analysing the telephone with caller ID data package. The system can also expand the local area control of the household electric appliances,and can be widely used in the household electric appliances and other kinds of control equipments.
The program of this system is written in the c language,which is solidified in the AT89C51. This article shows every part hardware structure of the system and the function the system can achieve: the DTMF coding and decoding circuit completes the decoding of the multi- sounds double frequency signal and the examination of the signal; the Liquid crystal display circuit displays the current telephone number and the amount of the telephone numbers; EEPROM storage circuit stores 10 telephone records at most; RS232 serial communication circuit can transmit the calling number into the personal computer. Moreover this article displays the writing of the software interface of the personal computer. Of this system,its design is simple, cost is low, organization is flexible and augmentability is strong. After test ,this system is effective and can achieve the expected function.

Keywords：Double Audio Frequency; Telephone with Caller ID; Serial Communications; EEPROM

以下为一级目录,详细目录及内容请与本站联系

目    录

引言 …………………………………………………………………………… 1
1  系统概述与方案设计……………………………………………………… 2
2  系统硬件方案设计………………………………………………………… 3
3  系统软件方案设计 ……………………………………………………… 19
4  系统调试 ………………………………………………………………… 26
5  结论 ……………………………………………………………………… 28
谢辞…………………………………………………………………………… 29
参考文献……………………………………………………………………… 30

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