電子信息類專業(yè)英語Unit-14-Digital-Signal-Processing-課件

Unit14DigitalSignalProcessingTextKeywordsTechnicaltermsExpressionsNotestothetextUnit14DigitalSignalProcesText

WhatisDSP?

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

WhatisDSP?

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

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

SignalProcessing

Signalscommonlyneedtobeprocessedinavarietyofways.Forexample,theoutputsignalfromatransducermaywellbecontaminatedwithunwantedelectrical“noise”.Theelectrodesattachedtoapatient’schestwhenanECGistakenmeasuretinyelectricalvoltagechangesduetotheactivityoftheheartandothermuscles.Thesignalisoftenstronglyaffectedby?“mainspickup”duetoelectricalinterferencefromthemainssupply.Processingthesignalusingafiltercircuitcanremoveoratleastreducetheunwantedpartofthesignal.Increasinglynowadays,thefilteringofsignalstoimprovesignalqualityortoextractimportantinformationisdonebyDSPtechniquesratherthanbyanalogelectronics.SignalProcessing

SignalsApplicationsofDSP

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

DSPteusingsmallvideocamerasmountedonthecomputermonitors,withonlyaconventionaltelephonelinelinkingthemtogether.InaudioCDsystems,DSPtechnologyisusedtoperformcomplexerrordetectionandcorrectionontherawdataasitisreadfromtheCD.

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

processing n.處理

origin n.起源，由來，起因

numerical adj.數(shù)字的，用數(shù)表示的

initially adv.最初，開頭

microphone n.擴(kuò)音器，麥克風(fēng)

transducer n.傳感器，變頻器

readout n.讀出器，讀出

contaminate v.污染Keywords

processing n.electrode n.電極

interference n.沖突，干涉

modem n.?[計(jì)]調(diào)制解調(diào)器

cellular adj.細(xì)胞的

monitor n.監(jiān)視器，監(jiān)控器electrode n.電極

interferTechnicalterms

DSP(DigitalSignalProcessing) 數(shù)字信號處理

electricalengineering 電子工程

radiowave 無線電波

aremote-sensingsatellite 遙感衛(wèi)星

CD(compactdisc) 光盤

ADC(analog-to-digitalconverter) 模數(shù)轉(zhuǎn)換器

ECG(Electrocardiograph) 心電圖

signalcompressionanddecompression 信號壓縮和解壓縮

digitalcellularphones 數(shù)字蜂窩電話

videocamera 攝影機(jī)Technicalterms

DSP(DigitalExpressions

comefrom 起源于

inmanycases 在多數(shù)情況下

beconvertedinto… 將…轉(zhuǎn)換為

dueto 因?yàn)?/p>

ratherthan 勝于

real-time 實(shí)時(shí)的Expressions

comefrom 起源Notestothetext

1.?DSPsignalcompressiontechnologyallowspeoplenotonlytotalktooneanotherbutalsotoseeoneanotherontheircomputerscreens,usingsmallvideocamerasmountedonthecomputermonitors,withonlyaconventionaltelephonelinelinkingthemtogether.

有了數(shù)字信號處理的信號壓縮技術(shù)，人們不但可以互相交談，而且能通過電腦屏幕看見彼此，這僅需一根普通的電話線連接，在計(jì)算機(jī)顯示器上安裝一個(gè)攝像頭便可實(shí)現(xiàn)。句中使用了“allows…to…to…”的結(jié)構(gòu)；“mountedonthecomputermonitors”為過去分詞定語后置，修飾“videocameras”；“using…”為現(xiàn)在分詞作方式狀語；“withonlyaconventionaltelephonelinelinkingthemtogether”為伴隨狀語。Notestothetext

1.?DSPsi2.?ThearchitectureofaDSPchipisdesignedtocarryoutsuchoperationsincrediblyfast,processinghundredsofmillionsofsampleseverysecond,toprovidereal-timeperformance:thatis,theabilitytoprocessasignal“l(fā)ive”asitissampledandthenoutputtheprocessedsignal,forexampletoaloudspeakerorvideodisplay.2.?ThearchitectureofaDS

數(shù)字信號處理器具有很快的運(yùn)算速度，每秒能執(zhí)行上億次的采樣，能夠達(dá)到實(shí)時(shí)效果。也就是說，它能夠一邊采樣，一邊處理實(shí)時(shí)信號，并將處理過的信號輸出給擴(kuò)音器或視頻播放器等設(shè)備。句中采用了“bedesignedto…,to…”的結(jié)構(gòu)，兩個(gè)“to”引導(dǎo)的不定式作目的狀語；“processinghundredsofmillionsofsampleseverysecond”為插入語，承前起補(bǔ)充說明的作用；“l(fā)ive”可翻譯為“real-time”；“thatis”可譯為意即、也就是說，其后的長句闡釋了主句所表達(dá)的意思。數(shù)字信號處理器具有很快的運(yùn)算速度，每秒能執(zhí)行上億次的采樣Unit14DigitalSignalProcessingTextKeywordsTechnicaltermsExpressionsNotestothetextUnit14DigitalSignalProcesText

WhatisDSP?

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

WhatisDSP?

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

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

SignalProcessing

Signalscommonlyneedtobeprocessedinavarietyofways.Forexample,theoutputsignalfromatransducermaywellbecontaminatedwithunwantedelectrical“noise”.Theelectrodesattachedtoapatient’schestwhenanECGistakenmeasuretinyelectricalvoltagechangesduetotheactivityoftheheartandothermuscles.Thesignalisoftenstronglyaffectedby?“mainspickup”duetoelectricalinterferencefromthemainssupply.Processingthesignalusingafiltercircuitcanremoveoratleastreducetheunwantedpartofthesignal.Increasinglynowadays,thefilteringofsignalstoimprovesignalqualityortoextractimportantinformationisdonebyDSPtechniquesratherthanbyanalogelectronics.SignalProcessing

SignalsApplicationsofDSP

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

DSPteusingsmallvideocamerasmountedonthecomputermonitors,withonlyaconventionaltelephonelinelinkingthemtogether.InaudioCDsystems,DSPtechnologyisusedtoperformcomplexerrordetectionandcorrectionontherawdataasitisreadfromtheCD.

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

processing n.處理

origin n.起源，由來，起因

numerical adj.數(shù)字的，用數(shù)表示的

initially adv.最初，開頭

microphone n.擴(kuò)音器，麥克風(fēng)

transducer n.傳感器，變頻器

readout n.讀出器，讀出

contaminate v.污染Keywords

processing n.electrode n.電極

interference n.沖突，干涉

modem n.?[計(jì)]調(diào)制解調(diào)器

cellular adj.細(xì)胞的

monitor n.監(jiān)視器，監(jiān)控器electrode n.電極

interferTechnicalterms

DSP(DigitalSignalProcessing) 數(shù)字信號處理

electricalengineering 電子工程

radiowave 無線電波

aremote-sensingsatellite 遙感衛(wèi)星

CD(compactdisc) 光盤

ADC(analog-to-digitalconverter) 模數(shù)轉(zhuǎn)換器

ECG(Electrocardiograph) 心電圖

signalcompressionanddecompression 信號壓縮和解壓縮

digitalcellularphones 數(shù)字蜂窩電話

videocamera 攝影機(jī)Technicalterms

DSP(DigitalExpressions

comefrom 起源于

inmanycases 在多數(shù)情況下

beconvertedinto… 將…轉(zhuǎn)換為

dueto 因?yàn)?/p>

ratherthan 勝于

real-time 實(shí)時(shí)的Expressions

comefrom 起源Notestothetext

1.?DSPsignalcompressiontechnologyallowspeo