《電子信息類專業(yè)英語(yǔ)》課件-第16章

Unit16DigitalSignalProcessing英文簡(jiǎn)歷的書寫(二)

WhatisDSP?

DSP,orDigitalSignalProcessing,asthetermsuggests,istheprocessingofsignalsbydigitalmeans.Asignalinthiscontextcanmeananumberofdifferentthings.Historicallytheoriginsofsignalprocessingareinelectricalengineering,andasignalheremeansanelectricalsignalcarriedbyawireortelephoneline,orperhapsbyaradiowave.Moregenerally,however,asignalisastreamofinformationrepresentinganythingfromstockpricestodatafromaremote-sensingsatellite.

Theterm“digital”comesfrom“digit”,meaninganumber,so“digital”literallymeansnumerical.Adigitalsignalconsistsofastreamofnumbers,usually(butnotnecessarily)inbinaryform.Theprocessingofadigitalsignalisdonebyperformingnumericalcalculations.

AnalogandDigitalSignals

Inmanycases,thesignalofinterestisinitiallyintheformofananalogelectricalvoltageorcurrent,producedforexamplebyamicrophoneorsomeothertypeoftransducer.Insomesituations,suchastheoutputfromthereadoutsystemofaCD(compactdisc)player,thedataisalreadyindigitalform.AnanalogsignalmustbeconvertedintodigitalformbeforeDSPtechniquescanbeapplied.Ananalog-to-digitalconverterorADC.Thisgeneratesadigitaloutputasastreamofbinarynumberswhosevaluesrepresenttheelectricalvoltageinputtothedeviceateachsamplinginstant.

SignalProcessing

Signalscommonlyneedtobeprocessedinavarietyofways.Forexample,theoutputsignalfromatransducermaywellbecontaminatedwithunwantedelectrical“noise”.Theelectrodesattachedtoapatient’schestwhenanECGistakenmeasuretinyelectricalvoltagechangesduetotheactivityoftheheartandothermuscles.Thesignalisoftenstronglyaffectedby“mainspickup”duetoelectricalinterferencefromthemainssupply.

Processingthesignalusingafiltercircuitcanremoveoratleastreducetheunwantedpartofthesignal.Increasinglynowadays,thefilteringofsignalstoimprovesignalqualityortoextractimportantinformationisdonebyDSPtechniquesratherthanbyanalogelectronics.

ApplicationsofDSP

DSPtechnologyisnowadayscommonplaceinsuchdevicesasmobilephones,multimediacomputers,videorecorders,CDplayers,harddiscdrivecontrollersandmodems,andwillsoonreplaceanalogcircuitryinTVsetsandtelephones.AnimportantapplicationofDSPisinsignalcompressionanddecompression.Signalcompressionisusedindigitalcellularphonestoallowagreaternumberofcallstobehandledsimultaneouslywithineachlocal“cell”.

DSPsignalcompressiontechnologyallowspeoplenotonlytotalktooneanotherbutalsotoseeoneanotherontheircomputerscreens,usingsmallvideocamerasmountedonthecomputermonitors,withonlyaconventionaltelephonelinelinkingthemtogether.InaudioCDsystems,DSPtechnologyisusedtoperformcomplexerrordetectionandcorrectionontherawdataasitisreadfromtheCD.

ThearchitectureofaDSPchipisdesignedtocarryoutsuchoperationsincrediblyfast,processinghundredsofmillionsofsampleseverysecond,toprovidereal-timeperformance:thatis,theabilitytoprocessasignal“l(fā)ive”asitissampledandthenoutputtheprocessedsignal,forexampletoaloudspeakerorvideodisplay.

英文簡(jiǎn)歷的書寫(二)

書寫英文簡(jiǎn)歷時(shí)，學(xué)生往往對(duì)其中的一些詞語(yǔ)和常用句型比較生疏，現(xiàn)歸納如下。

1.英文簡(jiǎn)歷中的一些常用詞匯

所學(xué)課程coursestaken/completed

必修課程compulsory/requiredcourses

選修課程selectedcourses

三好學(xué)生“ThreeGoods”student

獎(jiǎng)學(xué)金scholarship

優(yōu)秀團(tuán)員excellentleaguemember

優(yōu)秀學(xué)生干部excellentstudentleader

班長(zhǎng)monitor

學(xué)習(xí)委員commissaryinchargeofstudies

文娛委員commissaryinchargeofentertainment

體育委員commissaryinchargeofsports

勞動(dòng)委員commissaryinchargeofphysicallabor

團(tuán)支部書記leaguebranchsecretary

組織委員commissaryinchargeoforganization

宣傳委員commissaryinchargeofpublicity

學(xué)生會(huì)主席presidentofstudentcommittee

2.英文簡(jiǎn)歷中的一些常用句型

1)獲獎(jiǎng)情況與社會(huì)能力：

(1)?Iwonthesecondprizeofscholarshipandthefirstprizeinspeechcontestincollege.

在校曾獲得過(guò)二等獎(jiǎng)學(xué)金和演講比賽一等獎(jiǎng)。

(2)?Iwaselectedacommissaryinchargeofsportsincollegegradetwo.

在大二時(shí)任體育委員。

(3)?In2007Iwasawarded“ThreeGoods”ofcollege.

2007年度本人被評(píng)為院級(jí)三好學(xué)生。

(4)?IwonthetitleofExcellentLeagueMemberin2005.

2005年榮獲優(yōu)秀團(tuán)員稱號(hào)。

2)個(gè)人經(jīng)驗(yàn)與能力介紹

例如：

(1)?IhavereceivedanordinaryEnglisheducation,andhaveaslightknowledgeofJapanese.ItookaJapanesecourseincollege.

除接受普通的英語(yǔ)教育學(xué)習(xí)外，在校期間我還選學(xué)了日語(yǔ)，所以對(duì)日語(yǔ)也略知一二。

(2)?Icanwriteshorthandattherateof120wordsperminute,andtypewritingat55wordsEnglish.

速記速度為120字每分鐘，打字速度為55個(gè)字符每分鐘。

(3)?InsummerholidaysIhadtwomonthsofsuccessfuljobexperiencerangingfromsalesresponsibilitiestomanagementofmarketingdepartment.Adaptableversatile，industrious.

暑假中本人擁有了兩個(gè)月的成功工作經(jīng)驗(yàn)，范圍從銷售到市場(chǎng)部門的管理。適應(yīng)性強(qiáng)、善變通，勤奮。

(4)?ImajorinElectronicInformationEngineeringincollege,threeyearsofpart-timeworkinanITcompany.

大學(xué)主修電子信息工程，曾在IT公司兼職三年。

3)薪水要求

(1)?Iamwillingtoserveo