计算机专业英语教案--26[3页]

教材名称：《计算机专业英语》主编：来永春出版时间：电子教案第26次课学时2授课题目（章，节）ProjectFiveBeautifyingtheOnlineStorePagePartATheoreticalLearningSkillTwoMultimediaDevices授课类型（请打√）理论课□√研讨课□习题课□复习课□其他□教学目的：1Inthispart,ourtargetistoimprovethespeedofreadingprofessionalarticlesandthecomprehensionabilityofthereader.2.Wehavemarkedspecializedvocabularykeywordsinsomeparagraphssothatthereadercanquicklygraspthemainideaofthesentencesandparagraphs.教学方法、手段：1.Bythecomputer,projectorandblackboard-writing2.Bythestudent-centeredlearning,usingClassroomTeachingMethod,CommunicativeTeachingMethod,Task-basedTeachingMethodandAudio-visualTeachingMethod教学重点、难点：1.Masterthekeywordsandphrasesinthetext.2.Analyzethestructureofthecomplexsentencesinthetext.3.TranslatethetextintoChinesewiththehelpofthereferencematerials.3.DescribeMultimediaDevices教学内容及过程设计补充内容和时间分配教学设计Step1.Learningkeywordsandphrasesanimation动画digital-to-analog数/模transferrate传输率expansion扩展synthesis合成accesstime访问时间coprocessor协处理器joystick操纵杆sample采样voicesynthesizer声音合成器bandwidth宽带algorithm算法adapter适配器videoacceleratorboard视频加速卡videocaptureboard视频采集卡graphicsacceleratorboard图形加速卡20分钟audiocaptureboard音频采集卡waveformsynthesis波形合成appearancen.出现high-resolution高分辨率inaddition此外add-on外加的analogn.模拟FM(FrequencyModulation)频率调制FMsynthesisFM合成法waveformsynthesis波形合成法CD-ROM只读光盘binaryadj.二进制的single-speed单速CD-R可擦写光盘enhancedadj.增强的accessvt.获取，访问videocaptureboard视频采集卡Step2.Introductionoftrainingtarget1Inthispart,ourtargetistoimprovethespeedofreadingprofessionalarticlesandthecomprehensionabilityofthereader.2.Wehavemarkedspecializedvocabularykeywordsinsomeparagraphssothatthereadercanquicklygraspthemainideaofthesentencesandparagraphs.Step3.LeadinginashortintroductiontoMultimediaDevicesMultimediaisthecombinationofsound,graphics,animation,videoandtext.Itmakesthecomputerplayanimportantroleindevelopingapplications.MultimediaPCscanrunmultimediaapplications,normallyequippedwithasoundcard,aCD-ROMdriveandahigh-resolutioncolormonitor.Step4.Analyzingthestructureofthecomplexsentences1.MultimediaPCscanrunmultimediaapplications.2.Thesoundcardisanadd-ondevicethatgeneratesanalogsoundsignalsfromdigitaldata,usingeitheradigital-to-analogconverteroranFMsynthesischip.3.ThisistheenhancedCD-ROMformatdevelopedbyPhilips,SonyandMicrosoftthatallowsdatatobereadfromthediskatthesametimeasaudioisplayedback.Step5.Memorizingandmasteringthefollowingkeysentencesinthetext.1.AmultimediaPCisusedinvariousaspects.Itsappearanceisarevolutioninthecomputerfield.2.Itmakesthecomputerplayanimportantroleindevelopingapplications.3.Inaddition,therearealsoscanners,digitalcamerasandsoon.4.TheCDservesasmultimedia’schiefstorageandexchangemedium.5.Thesoundcardisanadd-ondevicethatgeneratesanalogsoundsignalsfromdigitaldata,usingeitheradigital-to-analogconverteroranFMsynthesischip.6.TherearethreemajorstandardsforPCsoundcards:AdLib,SoundBlaster,andWindows-compatible.5分钟5分钟15分钟45分钟7.TherearetwokindsofMIDIsoundgenerations:FMsynthesissimulatesmusicalnotesbymodulatingthefrequencyofabasecarrierwave;whereaswaveformsynthesisusesdigitizedsamplesofthenotestoproduceamorerealisticsound.8.ThisisthetechnologythatallowsausertowritedataandreaddatafromaCD-Rdisk.9.ACD-RdiskcanbeplayedinanystandardCD-ROMdrivebutneedsaspecialCD-Rdrivetowritedatatothedisk.10.AvideocaptureboardisahighspeeddigitalsamplingcircuitwhichstoresaTVpictureinmemorysothatitcanthenbeprocessedbyacomputer.11.Graphicsacceleratorboardisaspecializedexpansionboardcontainingagraphicscoprocessoraswellasalloftheothercircuitryfoundonavideoadapter.12.Transferringmostofthegraphicsprocessingtasksfromthemainprocessortothegraphicsacceleratorboardimprovessystemperformanceconsiderably13.Youcanseethatmultimediaisbynomeansjustoneoftheprecedingtechnologies.14.Thestandarddefineshowaudio,imagesanddataarestoredonaCD-ROMdisktoallowsoundandvideotobeaccessedatthesametime.思考题、作业题、讨论题：1.Reviewthekeywordsandphrasesinthetext.2.TranslatethetextintoChinesewiththehelpofthereferencematerials.3.Completetheexercisesinvolved.课后总结分析：