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进展，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、设计思路与功能。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。若在规定的时间有人抢答，则计时将自动停止；若在规定的时间无人抢答，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 competitionAuthor: Shi XiaoyunTutor: YueLiqinAbstract 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 integrateduse 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...
