This system design take at89S51 chip as core controlling element， auxiliary by necessity peripheral circuit， designed one to have retakes courses with replays the function to retake courses machine， it by 5V direct-current power supply power This system adds on one in the ordinary playback's foundation to retake courses the key to carry on the The control function including presses down retakes courses the key control circuit to store in the monolithic integrated circuit through a/D transformation chip gathering voice signal， presses retakes courses the key to carry on retakes courses the playback， presses again puts the key to start the normal A / the D sampling circuit uses ADC0809 to realize， D / a switching circuit uses DAC0832 to realize， and the postpositioned power amplifier actuates the speaker The present paper mainly introduced retakes courses machine the software and hardware part's design， as well as the question which and the solution in the design， the debugging process 本系统设计以AT89S51芯片为核心控制元件，辅以必要的外围电路，设计了一个具备复读与重放功能的复读机，它由5V直流电源供电。本系统在普通放音器的基础上加上一个复读键来进行控制。控制功能包括按下复读键控制电路通过A/D转换芯片采集语音信号存入单片机中，按复读键进行复读放音，再按放音键开始正常放音。A/D采样电路采用ADC0809来实现，D/A转换电路采用DAC0832来实现，并后置功率放大器来驱动扬声器工作。本论文主要介绍了复读机的软、硬件部分的设计，以及在设计、调试过程中遇到的问题及解决方案
Abstract With SCM technology， SCM has penetrated into all From household appliances， measuring control instruments， mechanical and electrical integration products to artificial intelligence， aerospace and other fields are large monolithic SCM is a centralized controller integrated circuit chip， memory， computing devices， and input and output ports of the chip micro- It is this feature because it makes the existence of circuits with single chip， can give full play to software and hardware combined with great advantage， maximize savings in hardware resources， to intelligent， multi-functional， making the circuit system developing more SCM powerful， stable performance， it is also high cost， which is widely used in its one of the important In industrial production， scientific research and daily life， the temperature is a measure of the most commonly used The traditional function of temperature measurement complex is limited， especially in the temperature of the display and non-linear processing， there are many Application of microcomputer intelligent temperature measuring instrument manufacturer， has wider range， linearity， convenient and flexible display， you can set the operation of key functions and so Keywords: microcontroller， intelligent， V / F converter， AD
Electronic clock has become a necessity for daily life， It's widely used in the family， stations， terminals， theaters， offices and other places， to people's lives， study， work great The system uses a single chip for the master chip AT89S52， realized the time， date display， modify and time functions， and power-down situation with time to maintain the function of In this paper， AT89S52-based production of single-chip electronic Papers At89s52 chip-based CS-III experiment box， the clock design， the use of the experimental box for 8-bit digital tube， when minutes and seconds and date display， keyboard with me in the time of the modification and alarm clock settings， including school modules， the number of days the month of processing module， a time when every minute modules， output modules and date selection Thus achieve the realization of the electronic
