电子信息技术专业英语 教学课件 作者 丁宁_ Unit 15 Communication system.ppt

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1、Unit15CommunicationSystem通信系统PartThreeCommunicationandInformationProcessingTechnicalterms:Preparingforthetext:Questionsfortextdiscussion:Takesomeexamplesabouttheapplicationofcommunicationinourdailylives.Thetelephonesatourhands,theradiosandtelevisionsinourlivingrooms,thecomputerterminalswith

2、accesstotheInternetinourofficesandhomes,Communicationthroughawirelesstelephonekeepsacardriverintouchwiththeofficeorhomemilesaway.Communicationkeepsaweatherforecasterinformedofconditionsmeasuredbyamultitudeofsensors.2.Whatbasicelementsdoesthecommunicationsysteminvolve?Transmitter,andthechann

3、el,andreceiver,1.transmitter发射机2.receiver接收机3.computerterminals计算机终端设备4.wirelesstelephone无线电话5.interferingsignal干扰信号6.highseas公海3.Describethefunctionofatransmitterorareceiver.Thepurposeofthetransmitteristoconvertthemessagesignalproducedbythesourceofinformationintoaformsuitablefortransmissio

4、noverthechannel.Thereceiverhasthetaskofoperatingonthereceivedsignalsoastoreconstructarecognizableformoftheoriginalmessagesignalforauser.Themainideaofthisunit:Thisunitmainlydiscussesthebasicknowledgeaboutcommunicationsystem.(1)Communicationentersourdailylivesinmanydifferentways.(2)Thereareth

5、reebasicelementstoeverycommunicationsystem,namely,transmitter,andthechannel,andreceiver.(3)Introducucethefunctionofcommunicationsystemelements.Technicalterms:Preparingforthetext:Questionsfortextdiscussion:Telltheadvantagesformobilephoneoverfixedphone?convenientandflexible2.Whatarethethreeba

6、sicpartsforacellularmobiletelephonesystem?mobileservicesswitchingcenter(MSC),radiobasestation(BS)andmobilestation(MS)3.Whatarethefunctionsofbasestations?1.cellularmobiletelephone蜂窝移动电话2.mobileserviceswitchingcenter(MSC)移动业务交换中心3.basestation(BS)基站4.mobilestation(MS)移动台5.publicswitchingteleph

7、onenetwork(PTSN)公共电话交换网NewWords1.multituden.多数(文)themultitudeofitsfacets它的很多方面eg.Vastmultitudeofbirdsvisitthislakeinspring.春天有大批的鸟飞临此湖.2.facetn.方面,(问题等的)一个方面eg.Therearemanyfacetstothisquestion.这个问题有很多方面.3.globen.地球theglobe=theearth地球,世界eg.travelroundtheg