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1、军械工程学院本科毕业论文摘要随着我国经济和文化事业的发展有很多竞争场合需要有快速公正的抢答器,而以往抢答器存在着种种弊端如:无法实现优先抢答、电路复杂、电路紊乱、功能少等等。但是电子技术的飞速发展解决了这些问题,如:优先编码电路能立即分辨出最先抢答者的编号；锁存电路可以避免抢答电路的混乱等。现代抢答器已经运用了微电子技术、单片机、智能芯片等各种先进的元器件,已由原来的单功能简单的抢答器发展到现在的多功能多路抢答器,实现了优先抢答、抢答定时等等,功能越来越齐全。该课题设计的是一款多功能八路数字抢答器,它具有优先抢答、限时抢答、铃
2、音提示、数字显示、系统报警等功能。主要由抢答电路、定时电路、报警电路、时序电路组成。其中抢答电路主要是分辨出选手的按键顺序,锁存优先抢答者的编号,供译码显示电路使用,并封锁输入电路,禁止其他选手抢答；定时电路主要是限定抢答时间,禁止选手超时抢答,抢答有效时间可以由问题的难易来设定。确保了比赛的公平性,更便于选手操作,实现快速无误的抢答。该设计电路主要用到了优先编码器,锁存器,555定时器等电子元器件。关键词抢答器；抢答电路；定时电路；报警电路；时序控制II军械工程学院本科毕业论文AbstractHastheverymanyco
3、mpetitionsituationalongwithourcountryeconomyandtheculturalestablishmentdevelopmenttoneedtohavefastfairviestoanswerfirst,butformerlyviedtoanswerfirsthasallsortsofmalpracticesforexample:Isunabletorealizefirstviestoanswerfirst,theelectriccircuitiscomplex,electriccircui
4、tdisorder,functionfewandsoon.Buttheelectronictechnologyrapiddevelopmenthassolvedtheseproblems,forexample:Firstcodestheelectriccircuittobeableimmediatelytodistinguishfirsttheviingtoanswerfirstserialnumber;Thelocksavestheelectriccircuittobepossibletoavoidviingtoanswer
5、firsttheelectriccircuitchaoticandsoon.Themodernageviedtoanswerfirsthasalreadyutilizedthemicroelectronictechnology,themonolithicintegratedcircuit,theintelligentchipandsooneachkindofadvancedprimarydevice,simplehasviedtoanswerfirstthedevelopmentpresentmulti-purposefrom
6、theoriginalsinglefunctionmulti-channeltovietoanswerfirst,realizedhasfirstviedtoanswerfirst,reprimandedtheby-pass,viedtoanswerfirstfixedtimeandsoon,thefunctionsweremoreandmorecomplete.Soldierelectronviestoanswerfirst,ithasfirstviestoanswerfirst,reprimandstheby-pass,t
7、hetimelimitviestoanswerfirst,thebellsoundprompt,thenumeraldemonstrated,thesystemreportstothepoliceandsoonthefunctions.Mainlybyviestoanswerfirsttheelectriccircuit,thetimingcircuit,thealarmcircuit,thesequencecircuitcomposes.Inwhichviestoanswerfirsttheelectriccircuitma
8、inlyisdistinguishescontestant'spressedkeyorder,thelocksavesfirsttheviingtoanswerfirstserialnumber,forthedecodingdisplaycircuituse,andblock
