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智力竞赛抢答器--基于tpe-d实验箱的抢答器实现

目    录

引言 内容来自www.paper51.com

一、明确设计系统的功能要求············································································· 5

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1.1要实现的功能要求····················································································· 5 paper51.com

   1.2明确系统的逻辑功能················································································· 5 内容来自www.paper51.com

  1.3拟定数字系统的总体方案········································································· 5

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二、触发器的选定规则························································································· 5

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   2.1根据数字系统的时序选择触发器····························································· 6 paper51.com

   2.2按工作要求速度选择触发器····································································· 6

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   2.3使用触发器时的注意事项········································································· 6 paper51.com

三、分析设计电路的逻辑状态 ··········································································· 6

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   3.1器件的选用································································································· 6

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   3.2工作时的逻辑状态分析············································································· 7

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四、数字电路设计中应注重的问题····································································· 8

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   4.1检查实验集成芯片的好坏········································································· 8

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   4.2损坏集成芯片的主要原因········································································· 8

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4.3合理布置连接是减少接线错误的有力措施············································· 8

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4.4线路的连接,焊接过程············································································· 9

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参考文献

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致谢 内容来自论文无忧网 www.paper51.com

 智力竞赛抢答器

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--基于TPE-D实验箱的抢答器实现 paper51.com

曾兴春 paper51.com

(某某市师范学院计算机科学系,云南 某某市 653100)

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【摘要】:本文叙述了数字逻辑电路的设计方法,并通过实例进行了讲解。抢答器又称第一信号鉴别器.数字抢答器由主体电路与扩展电路组成。优先判决电路为主体电路,灯光指示电路,音响指示电路组成扩展电路。在明确了电路的功能,组成的器件,布线后,经过布线、焊接、调试等工作完成数字抢答器。 内容来自www.paper51.com

关 键 词:逻辑;电路 ; 触发器 ; 时钟脉冲

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Abstract:This article describes the design of digitallogic circuits methods, and through the examples to explain. Quiz machine as the first signalidentifier. Digital circuit with the expansion of the main contest on thecircuit. Priority to the main circuit courtcircuit, lighting instructions circuits, audio instructions circuit compositionexpansion circuit. In defining the functionof a circuit, consisting of devices, wiring, a wiring, welding, digital quizmachine debugging work completed.

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Key words:Logic ;Electric circuit ;Capability ;Clock pulse 内容来自论文无忧网 www.paper51.com

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按照逻辑功能的不同,数字电路可以分成两大类:组合逻辑电路和时序逻辑电路。所谓组合电路,是指在任何时刻输出信号仅取决于该时刻的输入信号,而与先前的状态无关。所谓时序电路,是指该电路的输出状态不仅与输入有关,而且还与电路原先的状态有关。在实际应用中,自动控制系统就是根据各种输入信号的变量来进行识别、取样用以决定控制系数的输出状态。大多数控制系统是由组合逻辑电路与时序逻辑电路共同组成的数字电路系统。 http://www.paper51.com

抢答器又称第一信号鉴别器,应用于各种知识竞赛、文娱活动等场合。在知识竞赛中,特别是做抢答题时,在抢答过程中,为了知道哪一组或哪一位选手先答题,必须要有一个系统来完成这个任务。如果在抢答中,只靠人的视觉是很难判断出哪组先答题。抢答器的种类多种多样,有数字式的,电脑式的。在本文中将结合所学数字逻辑的基础,用清华大学科教仪器厂生产的TPE-D3试验箱实现一个简单的四人抢答器的制作。

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一、明确待设计系统的功能要求 内容来自www.paper51.com

1.1 要实现的功能要求

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当主持人宣布开始时,一旦任何参赛者最先按下按钮,则此参赛者对应的指示灯亮起,而其余三个参赛按钮不起作用,信号也不再被输出,直到主持人宣布下一轮开始为止。并且要求有声音提示。

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按照功能要求可以给出抢答器的大概电路组成。

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抢答器主体电路:抢答器的主题电路,主要是由每个抢答组都具有的独立的抢答电路组成。它要求本组抢答电路的输出信号,能关闭其他再抢答的可能性。 内容来自www.paper51.com

灯光指示电路:当有一个组已抢答时,则该组的抢答灯光指示电路应燃亮,使与会者一目了然地知道本组已经抢答。 http://www.paper51.com

音响告知电路:音响告知电路,可以独立成组,也可以全体共用一个。因为人对音源的判断不如对光源的判断那么敏锐,一般情况下只需要设置一个音响告知电路即可。

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1.2 明确系统的逻辑功能

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“四人智力抢答器”应实现两点基本逻辑功能:第一,清零功能—仅由主持人控制,清除在抢答前各显示器上的所有信号;第二,抢答键控功能—四个竞赛者各控制一个按扭,显示器仅显示首先抢答者对应指示灯,同时音响电路发出蜂鸣声,而滞后者无显示,无蜂鸣声。这两点功能要求都具有组合逻辑电路和时序逻辑电路的特性。即要输入触发信号,又要输出寄存信号,还要识别控制信号。

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1.3 拟定数字系统的总体方案

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①清零功能—在常见的触发器中,RS触发器的主要功能是置位(置“1”)与复位(置“0”或清"0"), D触发器和JK触发器都带有清除端CLR,它们的功能比较灵活,可实现RS触发器的功能,也可以相互转换,因此选用D触发器或1K触发器都可以满足此功能。②显示功能—可使用四只小灯泡,分别接四个触发器的输出端显示电平的高低,同时将四个输出端与音频信号一起加至控制门电路,即保证在四个输出端均为低电平时可将控制门锁住,使音频信号不能传输至音响放大电路,而只要一个进出端为高电平时控制门打下,使音频信号加至音响放大电路产生蜂呜声。③抢答键控功能—根据其逻辑功能的要求必须将组合逻辑电路和时序逻辑电路相结合,对四个按钮状态在抢答前由一个控制门进行取值采样,将时钟脉冲加至触发器CP端,只要有一个按扭动作,即只要改变一个触发器输入端的状态。则相对应的输出端产生翻转后,瞬间使控制门锁定翻转后的输出状态,此时控制门将时钟脉冲锁住。

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