电子信息专业英语教学课件作者刘睿强unit1.ppt

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1、UnitOneLesson1AnalogyandDigitalSignalLesson2ApplicationofOhm'sLawLesson3TheNANDGateLesson1AnalogyandDigitalSignalKeyWordsanalog模拟output输出gate(逻辑)门NOT逻辑非inverter反向器AND逻辑与OR逻辑或digital数字的binary二进制的下一页返回bit(二进制数)位pulse脉冲clock时钟data数据serial串行parallel并行logic

2、逻辑input愉入timingdiagram时序图Lesson1AnalogyandDigitalSignalWhatisananalogquantity-atemperaturelineAnanalogquantityisonehavingcontinuousvalues.Adigitalquantityisonehavingadiscretesetofvalues.Ifyougraphedthetemperatureonatypicalsummerday,youwouldhaveasmooth,

3、continuouscurvesimilartothecurveinFig1-2Otherexamplesofanalogquantitiesaretime,pressure,distance,andsound,asshowninFig1-3.Severalkindsofanalogsignals，asshowninFig1-4.下一页上一页返回Lesson1AnalogyandDigitalSignalWhatisadigitalquantity-stillatemperaturelineR

4、atherthangraphingthetemperatureonacontinuousbasis，supposeyoujusttakeatemperaturereadingeveryhour.Nowyouhavesampledvaluesrepresentingthetemperatureatdiscretepointsintime(everyhour)overa24-hourperiod，asindicatedinFig.1-5.Youhaveeffectivelyconvertedananal

5、ogquantitytoaformthatcannowbedigitizedbyrepresentingeachsampledvaluebyadigitalcode.ItisimportanttorealizethatFig.1-5itselfisnotthedigitalrepresentationoftheanalogquantity.下一页上一页返回Lesson1AnalogyandDigitalSignalSeveralkindsofdigitalsignals,asshowninFig1

6、-6Twoperiodicdigitalsignals,asshowninFig1-7下一页上一页返回Lesson1AnalogyandDigitalSignalAnexampleofanalogsystem—aspeakerApublicaddresssystem,usedtoamplifysoundsothatitcanbeheardbyalargeaudience,isonesimpleexampleofanapplicationofanalogelectronics.Thebasicdia

7、graminFig1-8illustratesthatsoundwaves,whichareanaloginnature,arepickedupbyamicrophoneandconvertedtoasmallanalogvoltagecalledtheaudiosignal.Thisvoltagevariescontinuouslyasthevolumeandfrequencyofthesoundchangesandisappliedtotheinputofalinearamplifier.下一

8、页上一页返回Lesson1AnalogyandDigitalSignalAnexampleofanaloganddigitalsystem—alsoaspeakerThebasicblockdiagraminFig1-9illustratesasystemusingdigitalandanalogmethods.Thecompactdisk(CD)playerisanexampleofasysteminwhichbothdigitalandanalogcircui