单片机的录音笔设计.docxVIP

 PAGE \* MERGEFORMAT IV 基于单片机的录音笔设计 作者姓名:谢斌 专业班级:信息工程2009050101 指导教师:周冬梅 摘 要 随着电子技术的飞速发展，数码录音笔已得到了越来越多的人的青睐，论文通过对多种录音笔的设计方案进行了比较和分析，选定STC90C52单片机设计了一个数码录音笔。 本文提出并设计实现了基于STC90C52 单片机和ISD4004语音芯片的多功能录音笔方案。首先介绍了设计方案的选择，接着进行了系统的硬件设计，包括音频输入输出电路的设计、按键控制电路的设计、液晶显示电路的设计等，设计中以STC90C52单片机主控制为核心，采用了美国ISD公司制造的ISD4004语音芯片实现录放系统的功能。其中按键控制电路对整个系统进行控制，显示电路用LCD1602更直观的录音放音，音频放大电路放大器采用通用型音频功率放大器LM386来实现。系统模块包括主程序模块、语音信号的采集模块、键盘扫描模块等，进行了程序流程的设计，编写了程序代码。系统实现了语音数据的录制、播放、暂停、循环播放、重复播放、选择上一段、选择下一段以及用LCD1602等显示相关操作等功能，设计具有一定的应用价值。 关键词：ISD4004 STC90C52　 录音笔 录音  Recording pen based on MCU Abstract：With the rapid development of electronic technology, digital voice recorder has been more and more people have favored paper on the design of a variety of voice recorder were compared and analyzed, the selected SCM STC90C52 designed a digital voice recorder. This paper is proposed based on STC90C52 SCM and ISD4004 pronunciation chip voice storage and playback design scheme. Firstly introduces the selection of design scheme, then the hardware design, including audio input/output circuit design, button control circuit design, liquid crystal display circuit design, design with STC90C52 single chip computer master control as the core, using America ISD companies manufacture of ISD4004 pronunciation chip realizing the function of recording system. One button control circuit to control the whole system, display circuit with a LCD more intuitive recording playback, audio amplifier circuit amplifier using universal model LM386 audio amplifier to realize. System modules including main program module, speech signal acquisition module, the keyboard scan module, speech signal storage module design, the design of the program flow and write program code. System realizes the speech data recorded, play,pause, looping, aired, choose a long, choosing the next paragraph and use LCD1602relevant operating functions such as design has certain, the application value. Key words：ISD4004 STC90C52 Recording pen