摘要近年来随着单片机技术和语音集成电路的发展，智能化语音产品给人们带来更便利的服务，更多彩的生活。本次设计是基于单片机及具有特殊功能的语音模块来实现的，主要实现方法是通过单片机定时扫描键盘模块来读取用户键入的命令，进而通过SPI通讯方式对语音模块发出控制和调用信号，从而使语音模块发出相应的声音。该系统包括主控模块、语音模块、显示模块、键盘模块及电源模块，还涉及到可编程并行输入输出接口的扩展等问题。本次设计的特点是直接用主控单片机去控制语音合成芯片，不需要在语音模组里再嵌入小型控制芯片，既简化了硬件电路图又省去对小控制芯片驱动程序的编写。语音芯片选用ISD4004，可以直接对语音模拟信号进行录入、转换和存储，不需要利用播音王等语音处理软件形成大量音频文件之后再加载到芯片里，操作过程比较简单方便。为了使扬声器发音比较准确、清晰，本设计利用专用汉语拼音发音软件来提供音源，并设计了放大和滤波电路对转换来的语音信号进行放大、滤波处理。26118
毕业论文关键字：  单片机  语音芯片  键盘输入
Abstract
In recent years, with the development of single-chip computer technology and voice IC, intelligent voice products bring people a more convenient service, a more colorful life.This design is based on single chip microcomputer and voice module, main implementation way is by single-chip microcomputer timer scanning the keyboard to read user type in the command module, and then through the SPI communication methods of signal control and calls, voice module so that the corresponding sound voice module.The system includes main control module, voice module, display module, keyboard module and power module, also involves the extension of the programmable parallel input/output interface.The characteristic of this design is directly with the master microcontroller to control the speech synthesis chip, don't need in the voice module embedded small control chip again, simplified the hardware circuit diagram and save for a small control chip driver writing.Voice choose ISD4004 chip, can be directly the voice analog signal input, conversion, and storage, do not need to use broadcast speech processing software to form a large number of audio files then loaded into the chip, the operation is simple and convenient.In order to make the speaker pronunciation is accurate, clear, this design uses special Chinese pinyin pronunciation software to provide a sound source, and design the amplifier and filter circuit to convert to speech signal amplifying, filtering processing.
Key words: single chip microcomputer  voice chip  keyboard input
目   录
摘要.Ⅰ
AbstractⅡ  1 绪论1
1.1 新型声音发声系统概述1
1.2 本次设计主要任务要求2
1.3 研发方向和技术关键2
1.4 本次设计的改进方向3
2 系统设计方案论证4
2.1 方案选择4
2.1.1  方案一4
    2.1.2  方案二4
    2.1.3  方案三5
2.2 系统设计原理5
2.3 系统设计框图6
3 硬件设计.7
3.1 主控模块.7
        3.1.1  主控芯片的选择论证7
    3.1.2  主控芯片简介8
    3.1.3  复位及晶振电路9
3.1.3  输入输出（I/O）接口扩展9
3.2 语音模块.11
    3.2.1  语音芯片选择论证11
    3.2.2  ISD4004芯片简介12
3.2.3  ISD4004寻址机制.13
    3.2.4  语音模块组成元件概述17
    3.2.5  语音模块组成电路解析18
    3.2.6  录音方式选择论证20 ISD4004+单片机声音发声系统设计+电路图+源程序:http://www.751com.cn/zidonghua/lunwen_20184.html