英语翻译摘要：本设计是用中小规模集成电路设计一个公用电话计时系统.通过本设计使其完成一下几项基本功能：每 3 分钟计时一

英语翻译
摘要：本设计是用中小规模集成电路设计一个公用电话计时系统.通过本设计使其完成一下几项基本功能：每 3 分钟计时一次；显示通话次数,最多为 99 次；每次定时误差小于 1 秒；具有手动复位功能；具有声响提醒功能.本设计主要有标准信号源,分频器,3 分钟定时器,计数器译码显示,声响提醒等电路组成,其工作原理为：当按下复位按键时,复位电路保证 3 分钟电路及二位十进制计数器同时清零,此时电话通话次数为零.当松开复位按键时,计时开始,3 分钟定时器的功能时每三分钟输出一个脉冲,该脉冲被送到计数译码器显示电路,便显示出通话次数；同时该脉冲被送到声计分频器.
关键词：小规模 3分钟 计数器 分频器
Abstract:This design is touse small and medium scale integrated circuit to design a pay phone timingsystem.Through the design to make it complete several basic functions:onceevery 3 minutes timer; Display,calls for a maximum of 99 times; Every time thetiming error is less than 1 second; With manual reset function; Have sound toremind function.This design mainly has a standard signal source,frequencydivider,3 minutes timer,counter,according to the decoding circuit of soundto remind,its working principle is:when press the reset button,the circuitand reset circuit ensure 3 minutes two decimal counter is reset at the sametime,the phone number is zero.Timing begins when loosen the reset button,threeminutes timer function outputs a pulse every three minutes,when the decodercircuit,pulse was sent to count number shows calls; At the same time the pulseis sent to score frequency counter.
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Key words:small 3minutes counter frequency divider

Abstract: This design is the design of a public telephonewith small and medium scale integrated circuit timing system. Through this design to complete the followingbasic functions: the time every 3 minutes; display the number of calls, for a maximum of 99 times; each time thetiming error is less than 1 seconds; with manual reset function; with sound reminding function. The design is a standard signal source, frequency divider, 3 minutes timer,counter decoding display, sound alarm circuit, its working principle is: when you press the reset button, a reset circuitto ensure that 3 minutes circuit and two decimal counterand clear, the number of calls to zero. When you release the reset button, start time, 3 minutes every three minutestimer function outputs a pulse, the pulse was sent to thecounting decoder and display circuit, it shows that the number of calls; at the same time the pulse is sent to thesound frequency divider.