【正文】 黃河科技學(xué)院畢業(yè)設(shè)計(jì)說明書 第 I 頁 畢業(yè)設(shè)計(jì)說明書 帶有語音播報(bào)的多路數(shù)字顯示競爭電路設(shè)計(jì) 摘 要 隨著各種益智類節(jié)目的不斷發(fā)展，越來越多的競賽搶答器被用在了其中，多路數(shù)字顯示競爭電路即 搶答器是一種典型的數(shù)字電路，它包括了組合邏輯電路和時(shí)序邏輯電路。 電路結(jié)構(gòu)形式多種多樣，可以利用簡單的與非門構(gòu)成，也可以利用觸發(fā)器構(gòu)成，也可以利用單片機(jī)來完成。 本文介紹了一種用 74 系列集成電路設(shè)計(jì)的數(shù)碼顯示搶答器的電路組成、設(shè)計(jì)思路及功能。該搶答器除具有基本的搶答功能外，還具有定時(shí)、計(jì)時(shí)、報(bào)警功能。綜合運(yùn)用定時(shí)器，計(jì)數(shù)器，編碼器，譯碼器，鎖存器等元器件組 合而成。主持人通過時(shí)間預(yù)設(shè)開關(guān)預(yù)設(shè)供搶答的時(shí)間，系統(tǒng)將完成自動倒計(jì)時(shí)。若在規(guī)定的時(shí)間內(nèi)有人搶答，則計(jì)時(shí)將自動停止；若在規(guī)定的時(shí)間內(nèi)無人搶答，則在系統(tǒng)中的蜂鳴器將發(fā)出聲響，提示主持人本輪搶答無效，實(shí)現(xiàn)報(bào)警功能。 關(guān)鍵詞： 搶答器，定時(shí)，計(jì)時(shí)，報(bào)警 黃河科技學(xué)院畢業(yè)設(shè)計(jì)說明書 第 II 頁 黃河科技學(xué)院畢業(yè)設(shè)計(jì)說明書 第 III 頁 The many road digital display circuit design petition 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 bination of logic circuits and sequential logic circuit. Circuit structure of a variety of forms， can make use of simple and nongate structure can also be used to trigger position. In this paper， the electric circuit and designing thought of an answering racer based on the monused series of 74 IC with 8wire 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 timesetting 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 黃河科技學(xué)院畢業(yè)設(shè)計(jì)說明書 第 IV頁 目 錄 1 緒論 ...................................................................................................................................... 1 課題背景及目的 ....................................................................................................... 1 國內(nèi)外研究狀況 ....................................................................................................... 1 課題研究方法 ........................................................................................................... 2 論文構(gòu)成及研究內(nèi)容 ............................................................................................... 3 2 模塊電路設(shè)計(jì) ...................................................................................................................... 4 搶答電路 ................................................................................................................... 4 顯示電路 ................................................................................................................... 5 計(jì)時(shí)電路 ................................................................................................................... 7 報(bào)警電路 ................................................................................................................... 9 聲音報(bào)警電路 .................................................................................................. 9 光報(bào)警電路 ...................................................................................................... 9 3 總體電路設(shè)計(jì) .................................................................................................................... 11 4 主要芯片介紹 .................................................................................................................... 13 74LS175 寄存器 ..................................................................................................... 13 74LS192 計(jì)數(shù)器 ..................................................................................................... 14 555 定時(shí)器 .............................................................................................................. 15 74LS148 .................................................................................................................. 16 7448 譯碼器 ............................................................................................................ 17 5 仿真過程及結(jié)果 ................................................................................................................ 19