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1、 本科生毕业设计基于单片机的智能电话录音系统Telephone automatic recording system of MCU学生姓名所在专业自动化所在班级2006级（1）班申请学位工学学士指导教师职称讲师副指导教师职称答辩时间设计总说明IINTRODUCTIONII绪论- 1 -第1章 系统总体设计- 2 -1.1 系统结构- 2 -1.2 系统组成- 2 -1.3 系统功能- 2 -1.4 系统可行性分析- 3 -第2章 主要硬件选择- 3 -2.1 微处理器- 3 -2.1.1 AT89C52的概述- 3 -2.1.2 AT89C52单片机的硬件结构- 4 -2.1.3 AT89C5
2、2的主要功能特性- 4 -2.1.4 AT89C52的引脚说明- 4 -2.1.5 AT89C52的复位电路- 7 -2.2 双音多频译码器MT8880- 8 -2.2.1 MT8880功能概述- 8 -2.2.2 MT8880的内部结构图- 8 -2.2.3 MT8880引脚图及引脚功能描述- 9 -2.2.4 MT8880的工作原理- 10 -2.2.5 MT8880的译码- 11 -2.3 语音芯片ISD4004- 11 -2.3.1 ISD4004功能概述- 11 -2.3.2 ISD4004引脚及其功能描述- 12 -2.3.3 ISD的SPI- 13 -2.3.3.1 信息快进-
3、14 -2.3.3.2 上电顺序- 14 -2.3.3.3 SPI端口的控制位- 15 -2.3.3.4 SPI控制寄存器- 16 -2.4 继电器- 16 -2.4.1 继电器的介绍- 16 -2.4.2 继电器的驱动原理- 17 -第3章 硬件电路- 18 -3.1 振铃检测电路- 18 -3.2 自动摘机电路- 19 -3.3 DTMF信号处理电路- 21 -3.4 语音接口电路- 22 -3.5 单片机电路- 23 -第4章 软件设计- 24 -4.1 系统软件流程图- 24 -4.2 程序代码- 24 -第5章 结束语与展望- 25 -第6章 鸣谢- 26 -参考文献- 27 -附录
4、：单片机控制电路- 28 -附录：摘机解码电路- 29 -附录：语音芯片电路- 30 -附录：程序代码- 31 -附录：实物图- 40 -设计总说明随着我国社会经济和通信行业的迅速发展，电话已成为人们日常生活和工作中非常重要的联络手段，以前需要见面或书信才能解决的事情现在只需一个电话就办妥了。但这种方便快捷同时也带来了一个弊病，那就是有些事情事后说不清，容易造成不必要的麻烦，有些单位只得以电话录音机来暂时解决这个问题，此类设备自动化程度差，存储量小，查询不便，而且需要每条线路都配备一个相应设备，成本高，效率低。特别是在电力调度、公安监听、防汛报警等较特殊的领域，使其对语音工作的发生过程都需要有
5、个准确可靠的记录过程，随着社会技术的进步，这些领域自身对可靠的语音处理效果的追求，使得对老式录音设备的社会适应性提出了有力的挑战。电话自动录音系统的发明给人们带来极大的方便。日常生活中，当主人外出不在家时，电话自动录音系统便可履行主人的义务，录制下对方的留言，以便主人回来后及时得到对方留下的信息。当主人不在家时，对方在语音的提示下听取留言或留下一段信息。早期的录音电话采用盒式录音带，目前已普遍采用集成电路存储的产品。该电话自动录音系统便是其中典型的一种。随着科学技术的发展，录音电话必将朝着多功能化、更智能化、人性化的方向发展。本文首先探讨了数字录音系统的概况，并根据现有的技术条件，利用单片机和
6、一些外围器件设计一种适合家庭、办公室等室内场合的智能电话录音系统。本次设计采用AT89C52单片机作为电话录音系统的的控制核心，利用电话线作传输媒体的面向普通居民的智能电话录音系统。当有电话打入时即电话振铃检测电话检测到电话线路发来的振铃(铃流)并等待至系统默认的振铃次数后 ,控制器自动摘机 ,摘机后在语音电路的提示下将主人留言发送给对方,最后录入对方语音,直到检测到对方挂机为止，完成录音电话的功能。此次设计采用模块化的设计方案。根据系统的功能主要分为这几部分：振铃检测部分；自动摘挂机部分；DTMF信号解码部分；语音控制与语音录放部分。而本设计的主要内容就是围绕这些部分进行芯片的选择，电路的设
7、计以及软件的设计。关键词：DTMF解码电路；语音芯片ISD4004；智能电话录音系统INTRODUCTIONWith the development of Chinas economy and telecommunications, telephone has become a very important means of communication in peoples daily life and work. For example, things which are solved by meeting or communication with letter in the past i
8、s solved just by a phone now. However, this convenience also has a drawback. It is difficult to explain some things after the call and causes some troubles. In order to solve the problem, some people have to use a telephone tape to record the conversation. This equipment is not only poor intelligent
9、 and small memory, but also inconvenient in inquiring. Every line needs to equip with a telephone tape. It makes the equipment with high cost and low efficiency. It need to record the complete conversation in some special situation such as scheduling electric power, polices monitoring activity and a
10、larm for flood. With progress of social technology and demand for reliable monitoring voice, old recording equipment has to face powerful challenge of the social adaptability. The invention of telephone automatic recording system brings great convenience for people. In daily life, when the master is
11、 away, this system can fulfill the obligations of the owner to record the message from other side that is known if the master is back. When the master is not at home, the people who made a phone call leave a message or information with the speech cues.People have generally adopted integrated circuit
12、 storage products instead of cassette tape. This telephone automatic recording system is one of the typical types. With the development of science and technology, recording phone will become more multi-purpose and more intellectualized.First this paper discusses the digital recording system. Accordi
13、ng to the existing technical conditions and using single chip and some periphery devices, design an intelligent phone recording system which is suitable for indoor occasions such as family office. The design uses AT89C52 single chip as the control core of the system, and uses phone line as the trans
14、mission media. When there is a call, telephone tests telephone line ringing and the controller will be offhook until the ringing time reaches default value. With hint of speech circuit, it sends host massage to the caller and record speech until tests the caller offhook the phone. The record will co
15、mplete.The design uses modularization design plan. System function is classified as: ringing test, offhook automatically, DTMF information decoding, speech control and speech record playback. The main of the design is to choice chips according to the function and design circuit and software.Keywords：DTMF decoding circuit；speech chip ISD4004; telephone automatic recording system基于单片机的智能电话录音系统绪论数字录音系统是将现场的语音模拟信号转换为离散的数字信号，然后存储在一定的存储介质上的一种录音方式，他也是数字语音处理技术中常用的一种方式。采用数字录音技术，有较高的效率和自动化程度，录音时间也长，也可将信息长
