毕业设计：带有语音播报的多路数字显示竞争电路说明书.doc

毕业设计说明书 带有语音播报的多路数字显示竞争电路设计 摘 要 随着各种益智类节目的不断发展，越来越多的竞赛抢答器被用在了其中，多路数字显示竞争电路即抢答器是一种典型的数字电路，它包括了组合逻辑电路和时序逻辑电路。电路结构形式多种多样，可以利用简单的与非门构成，也可以利用触发器构成，也可以利用单片机来完成。 本文介绍了一种用74系列集成电路设计的数码显示抢答器的电路组成、设计思路及功能。该抢答器除具有基本的抢答功能外，还具有定时、计时、报警功能。综合运用定时器，计数器，编码器，译码器，锁存器等元器件组合而成。主持人通过时间预设开关预设供抢答的时间，系统将完成自动倒计时。若在规定的时间内有人抢答，则计时将自动停止；若在规定的时间内无人抢答，则在系统中的蜂鸣器将发出声响，提示主持人本轮抢答无效，实现报警功能。 关键词：抢答器，定时，计时，报警 The many road digital display circuit design competition Author: Shi Xiaoyun Tutor: Yue Liqin Abstract With the continuous development of a variety of educational programs， contest Responder is increasingly being used in it .The responder is a typical digital circuit， including a combination of logic circuits and sequential logic circuit. Circuit structure of a variety of forms， can make use of simple and non-gate structure can also be used to trigger composition. In this paper， the electric circuit and designing thought of an answering racer based on the common-used series of 74 IC with 8-wire is introduced， and its function is also described. The answering race’s function includes timing， counting， and alarming， besides the basic function of an answering racer. The integrated use of timer， counter， encoder， decoder. The host sets the provided time for the answering race through the time-setting switch， after this the system will count down the time automatically .If anybody answer the question on time， the counting of time will stop; If nobody answer the question on time ，the alarm will give out some sound， helping the host know the race in this turn is of no use ，so the function of alarming is achieved.Keywords：Responder，timing，counting，alarm目 录 1 绪论 1 1.1 课题背景及目的 1 1.2 国内外研究状况 1 1.3 课题研究方法 2 1.4 论文构成及研究内容 3 2 模块电路设计 4 2.1 抢答电路 4 2.2 显示电路 5 2.3 计时电路 7 2.4 报警电路 9 2.4.1 声音报警电路 9 2.4.2 光报警电路 9 3 总体电路设计 11 4 主要芯片介绍 13 4.1 74LS175寄存器 13 4.2 74LS192计数器 14 4.3 555定时器 15 4.4 74LS148 16 4.