电子信息类专业英语Unit-14-Digital-Signal-Processing-课件

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“live”asitissampledandthenoutputtheprocessedsignal,forexampletoaloudspeakerorvideodisplay.usingsmallvideocamerasmounKeywords

processing n.处理

origin n.起源，由来，起因

numerical adj.数字的，用数表示的

initially adv.最初，开头

microphone n.扩音器，麦克风

transducer n.传感器，变频器

readout n.读出器，读出

contaminate v.污染Keywords

processing n.electrode n.电极

interference n.冲突，干涉

modem n. [计]调制解调器

cellular adj.细胞的

monitor n.监视器，监控器electrode n.电极

interferTechnicalterms

DSP(DigitalSignalProcessing) 数字信号处理

electricalengineering 电子工程

radiowave 无线电波

aremote-sensingsatellite 遥感卫星

CD(compactdisc) 光盘

ADC(analog-to-digitalconverter) 模数转换器

ECG(Electrocardiograph) 心电图

signalcompressionanddecompression 信号压缩和解压缩

digitalcellularphones 数字蜂窝电话

videocamera 摄影机Technicalterms

DSP(DigitalExpressions

comefrom 起源于

inmanycases 在多数情况下

beconvertedinto… 将…转换为

dueto 因为

ratherthan 胜于

real-time 实时的Expressions

comefrom 起源Notestothetext

1. DSPsignalcompressiontechnologyallowspeoplenotonlytotalktooneanotherbutalsotoseeoneanotherontheircomputerscreens,usingsmallvideocamerasmountedonthecomputermonitors,withonlyaconventionaltelephonelinelinkingthemtogether.

有了数字信号处理的信号压缩技术，人们不但可以互相交谈，而且能通过电脑屏幕看见彼此，这仅需一根普通的电话线连接，在计算机显示器上安装一个摄像头便可实现。句中使用了“allows…to…to…”的结构；“mountedonthecomputermonitors”为过去分词定语后置，修饰“videocameras”；“using…”为现在分词作方式状语；“withonlyaconventionaltelephonelinelinkingthemtogether”为伴随状语。Notestothetext

1. DSPsi2. ThearchitectureofaDSPchipisdesignedtocarryoutsuchoperationsincrediblyfast,processinghundredsofmillionsofsampleseverysecond,toprovidereal-timeperformance:thatis,theabilitytoprocessasignal“live”asitissampledandthenoutputtheprocessedsignal,forexampletoaloudspeakerorvideodisplay.2. ThearchitectureofaDS

数字信号处理器具有很快的运算速度，每秒能执行上亿次的采样，能够达到实时效果。也就是说，它能够一边采样，一边处理实时信号，并将处理过的信号输出给扩音器或视频播放器等设备。句中采用了“bedesignedto…,to…”的结构，两个“to”引导的不定式作目的状语；“processinghundredsofmillionsofsampleseverysecond”为插入语，承前起补充说明的作用；“live”可翻译为“real-time”；“thatis”可译为意即、也就是说，其后的长句阐释了主句所表达的意思。数字信号处理器具有很快的运算速度，每秒能执行上亿次的采样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“live”asitissampledandthenoutputtheprocessedsignal,forexampletoaloudspeakerorvideodisplay.usingsmallvideocamerasmounKeywords

processing n.处理

origin n.起源，由来，起因

numerical adj.数字的，用数表示的

initially adv.最初，开头

microphone n.扩音器，麦克风

transducer n.传感器，变频器

readout n.读出器，读出

contaminate v.污染Keywords

processing n.electrode n.电极

interference n.冲突，干涉

modem n. [计]调制解调器

cellular adj.细胞的

monitor n.监视器，监控器electrode n.电极

interferTechnicalterms

DSP(DigitalSignalProcessing) 数字信号处理

electricalengineering 电子工程

radiowave 无线电波

aremote-sensingsatellite 遥感卫星

CD(compactdisc) 光盘

ADC(analog-to-digitalconverter) 模数转换器

ECG(Electrocardiograph) 心电图

signalcompressionanddecompression 信号压缩和解压缩

digitalcellularphones 数字蜂窝电话

videocamera 摄影机Technicalterms

DSP(DigitalExpressions

comefrom 起源于

inmanycases 在多数情况下

beconvertedinto… 将…转换为

dueto 因为

ratherthan 胜于

real-time 实时的Expressions

comefrom 起源Notestothetext

1. DSPsignalcompressiontechnologyallowspeo