电子信息工程专业英语教程（第5版） 课件 Lesson 16 Digital Signal Processing

Unit6DigitalSignalProcessingLesson16DigitalSignalProcessing《电子信息工程专业英语教程（第5版）》Lesson16BasicConceptsofDSPBackgroundsTexttour

LanguageinuseVocabularyStructureReading/writingtechniques2024/5/292《电子信息工程专业英语教程（第5版）》Terminologysampleandholdcircuit

采样保持电路zeroorderhold

零阶保持acquisitiontime

采集时间quantizationlevel(step)

量化电平（间隔）Backgrounds2024/5/293《电子信息工程专业英语教程（第5版）》Terminology

fullscalerang

满量程范围dynamicrange

动态范围signal-to-noiseratio

信噪比Backgrounds2024/5/294《电子信息工程专业英语教程（第5版）》TerminologyNyquisttheorem

奈奎斯特定理undersampling

欠采样aliasing

混叠现象spectralinversion

频谱反转Backgrounds2024/5/295《电子信息工程专业英语教程（第5版）》Terminologyanti-aliasingfilter

抗混叠滤波器realtime

实时Backgrounds2024/5/296《电子信息工程专业英语教程（第5版）》TexttourOutlineIntroductionTheEssentialsofAnalog-to-digitalandDigital-to-analogConversionTechnologiesfordigitalsignalprocessingTheFPGAAlternativeTheASICAlternativeTheGPPAlternative2024/5/297《电子信息工程专业英语教程（第5版）》IntroductionWedon'tspeakinadigitalsignal.Adigitalsignalisalanguageof1sand0sthatcanbeprocessedbymathematics.Wespeakinreal-world,analogsignals.Analogsignalsarerealworldsignalsthatweexperienceeveryday-sound,light,temperature,andpressure.Adigitalsignalisanumericalrepresentationoftheanalogsignal.Itmaybeeasierandmorecosteffectivetoprocessthesesignalsinthedigitalworld.Intherealworld,wecanconvertthesesignalsintodigitalsignalsthroughtheanalog-to-digitalconverter,processthesignals,andifneeded,bringthesignalsbackouttotheanalogworldthroughthedigital-to-analogconverter.

2024/5/298《电子信息工程专业英语教程（第5版）》TheEssentialsofA/DandD/AConversion(1)A/DConversion

Figure6.1Theanalog-to-digitalconversionTosummarize,A/Dcomprisesanti-aliasing,sampling,quantizationanddigitisation.2024/5/299《电子信息工程专业英语教程（第5版）》TheEssentialsofA/DandD/AConversion(2)

D/AConversion

Figure6.2Thedigital-to-analogconversion2024/5/2910《电子信息工程专业英语教程（第5版）》advantagesofdesigningwithDSPsoverothermicroprocessors:Single-cyclemultiply-accumulateoperationsReal-timeperformance,simulationandemulationFlexibilityReliabilityIncreasedsystemperformanceReducedsystemcostTechnologiesforDSP

DSPs

2024/5/2911《电子信息工程专业英语教程（第5版）》HavethecapabilityofbeingreconfigurablewithinasystemOffergreaterrawperformanceperspecificoperation

TechnologiesforDSP

FPGAs2024/5/2912《电子信息工程专业英语教程（第5版）》canbetailoredtoperformspecificfunctionsextremelywellcanbemadequitepowerefficient.cannotbeiterativelychangedorupdatedwhileinproductdevelopment.typicallyemployedasbusinterfaces,gluelogic.,and/orfunctionalacceleratorsforaprogrammableDSP-basedsystem.TechnologiesforDSP

ASICs2024/5/2913《电子信息工程专业英语教程（第5版）》bestsuitedforperformingabroadarrayoftasks.forapplicationsinwhichtheendproductmustprocessanswersinrealtime,ormustdosowhilepoweredbyconsumerbatteries,GPPscomparativelypoorrealtimeperformanceandhighpowerconsumptionallbutrulesthemoutTechnologiesforDSP

GPPs2024/5/2914《电子信息工程专业英语教程（第5版）》VocabularyReciprocalprecederangeproportiondeducealternativeIterativeimpedimentStructureReading/writingtechniquesLanguageinuse2024/5/2915《电子信息工程专业英语教程（第5版）》Vocabulary2024/5/2916《电子信息工程专业英语教程（第5版）》ReciprocalindictionaryConcerningeachoftwoormorepersonsorthings.

交互的，相互的Interchanged,given,orowedtoeachother:

互换的，交换的reciprocalagreementstoabolishcustomsdutiesareciprocalinvitationtolunch.Performed,experienced,orfeltbybothsides:

相互的reciprocalrespect.2024/5/2917《电子信息工程专业英语教程（第5版）》ReciprocalindictionaryInterchangeable;complementary:

互补的reciprocalelectricoutlets.Oforrelatingtothereciprocalofaquantity.

相反的，倒数的Anumberrelatedtoanotherinsuchawaythatwhenmultipliedtogethertheirproductis1.

倒数2024/5/2918《电子信息工程专业英语教程（第5版）》ReciprocalintextThelengthofthesamplingintervalisthesameasthesamplingperiod,andthe

reciprocalofthesamplingperiodisthesamplingfrequency

fs.

“采样间隔”的长度和“采样周期”的长度相同，而“采样周期”的倒数就是“采样频率”fs。

2024/5/2919《电子信息工程专业英语教程（第5版）》PrecedeindictionaryTocome,exist,oroccurbeforeintime.先于…Tocomebeforeinorderorrank;surpassoroutrank.高于…Tobeinapositioninfrontof;goinadvanceof.处于…前面；走在…前面Topreface;introduce给…作序；介绍：Heprecededhislecturewithahumorousanecdote.Tocomeorgobeforeintime,order,rank,orposition.抢先，居先2024/5/2920《电子信息工程专业英语教程（第5版）》PrecedeintextTomakesurealiasingwillnotoccur,samplingisalwayspreceded

bylowpassfiltering.为了保证不会出现混叠，在采样之前总是要进行低通滤波。

2024/5/2921《电子信息工程专业英语教程（第5版）》RangeindictionaryExtentofperception,knowledge,experience,orability.

范围Theareaorsphereinwhichanactivitytakesplace.

界限Thefullextentcovered:

涵盖范围withintherangeofpossibilities.Anamountorextentofvariation:

变动范围 2024/5/2922《电子信息工程专业英语教程（第5版）》RangeindictionaryThegamutoftonesthatavoiceoraninstrumentiscapableofproducing.

音域Themaximumextentordistancelimitingoperation,action,oreffectiveness,asofaprojectile,anaircraft,aradiosignal,orasound.

射程，音程Themaximumdistancethatcanbecoveredbyavehiclewithaspecifiedpayloadbeforeitsfuelsupplyisexhausted.

路程Thedistancebetweenaprojectileweaponanditstarget.

射程2024/5/2923《电子信息工程专业英语教程（第5版）》RangeindictionaryAtestingareaatwhichrocketsandmissilesarelaunchedandtracked.

火箭试验场Anextensiveareaofopenlandonwhichlivestockwanderandgraze.

放牧区Thegeographicregioninwhichaplantorananimalnormallylivesorgrows.

地理分布区2024/5/2924《电子信息工程专业英语教程（第5版）》RangeindictionaryThedifferenceorintervalbetweenthesmallestandlargestvaluesinafrequencydistribution.

频差Aclass,arank,oranorder:

等级或次序：Anextendedgrouporseries,especiallyaroworchainofmountains.

山脉2024/5/2925《电子信息工程专业英语教程（第5版）》Rangeintext

Thestrengthofthesignalcomparedtothatofthequantizationerrorsismeasuredbydynamicrange

andsignal-to-noiseratio.相对于量化误差的信号强度使用“动态范围”和“信噪比”来度量。2024/5/2926《电子信息工程专业英语教程（第5版）》Rangeinuse

adjustablerange可调范围applicationrange应用范围distributionrange分布范围;分布幅域low-frequencyrange低频段,低频范围rangeofactivity生产规模;经济活动范围rangeofallowableerror容许误差范围rangeofgoods商品品种rangeofintegration积分范围rangeoflinearity线性区域,线性变化范围rangeofsensitivity灵敏度范围rangeofsetvalue设定值范围2024/5/2927《电子信息工程专业英语教程（第5版）》Rangeinuse

rangescopereachcompass

range指“运用心、眼、机器、力量等所能概括的整个范围”,如:therangeofhisknowledge他的知识面scope指“活动、影响等的范围”,特指“了解、见解、适用性以外的范围”,如:Itiswithinmyscope.那是在我的范围之内reach指“手、运动、智力、影响等能及的范围”,如:It'sbeyondthereachofhumanaid.那是人力所不及的。compass着重“某物所能活动的范围”,如:speakwithincompass在限定范围内讲话。2024/5/2928《电子信息工程专业英语教程（第5版）》ProportionindictionaryApartconsideredinrelationtothewhole.部分Arelationshipbetweenthingsorpartsofthingswithrespecttocomparativemagnitude,quantity,ordegree:比例theproperproportionbetweenoilandvinegarinthedressing.Arelationshipbetweenquantitiessuchthatifonevariesthenanothervariesinamannerdependentonthefirst比率WedonotalwaysfindvisiblehappinessinproportiontovisiblevirtueAgreeableorharmoniousrelationofpartswithinawhole;balanceorsymmetry.均称，平衡Dimensions;size.容积；大小Astatementofequalitybetweentworatios.比例2024/5/2929《电子信息工程专业英语教程（第5版）》ProportionindictionaryToadjustsothatproperrelationsbetweenpartsareattained.

使成比例Toformthepartsofwithbalanceorsymmetry.

使平衡2024/5/2930《电子信息工程专业英语教程（第5版）》ProportionintextThisprocessbeginsbyconvertingeachdigitalcodeintoananalogvoltagethatisproportionalinsizetothenumberrepresentedbythecode.首先，将码字转换为和码字所代表数字的大小成正比的模拟电压。

2024/5/2931《电子信息工程专业英语教程（第5版）》Proportioninuse

inproportion相称；恰如其分;inproportionas[to]按...的比例;与...成比例;和...相称indirectproportionto与...成正比例ininverseproportionto与...成反比例inproportionwith按比例intheproportionof按...的比例outofproportionto和...不成比例;和...不相称2024/5/2932《电子信息工程专业英语教程（第5版）》DeduceindictionaryToreach(aconclusion)byreasoning.

推论Toinferfromageneralprinciple;reasondeductively.

演绎推理Totracetheoriginorderivationof.

溯源2024/5/2933《电子信息工程专业英语教程（第5版）》DeduceintextAlloftheimportantsignalcharacteristicscanbededucedfromthecopyofthespectrumthatappearsinthebasebandthroughsampling.信号的所有重要特征都可以从因采样而出现在基带的频谱副本中得到。

2024/5/2934《电子信息工程专业英语教程（第5版）》Thechoicebetweentwomutuallyexclusivepossibilities.

两者择一Asituationpresentingsuchachoice.

可选择的Eitherofthesepossibilities.

另一可选择的Oneofanumberofthingsfromwhichonemustbechosen.

必须选出的一项的Alternativeindictionary2024/5/2935《电子信息工程专业英语教程（第5版）》Allowingornecessitatingachoicebetweentwoormorethings.

二选一的Existingoutsidetraditionalorestablishedinstitutionsorsystems:

他择性的analternativelifestyle.一种超越古今的生活方式Espousingorreflectingvaluesthataredifferentfromthoseoftheestablishment:

标新立异的analternativenewspaperalternativegreetingcards.Alternativeindictionary2024/5/2936《电子信息工程专业英语教程（第5版）》However,therearesomeoftheotheralternativesavailablefordigitalsignalprocessing.HowtheycomparetoDSPs?然而，实现数字信号处理还可以有其他一些选择。和数字信号处理器相比，这些选择如何呢？

Alternativeintext2024/5/2937《电子信息工程专业英语教程（第5版）》havenoalternativebut除...外别无选择;只有;只好Alternativeinuse2024/5/2938《电子信息工程专业英语教程（第5版）》havenoalternativebut除...外别无选择;只有;只好Alternativeinuse2024/5/2939《电子信息工程专业英语教程（第5版）》choicealternativeoptionpreferenceselectionelectionEachofthesenounsdenotestheact,power,orrightofchoosing.

Choiceimpliesbroadlythefreedomtochoosefromaset,asofpersonsorthingsThestoreoffersawidechoiceoffruitsandvegetables.Ihadnochoice.Theirdecisionwasfinal.

Alternativeemphasizesachoosingbetweenonlytwopossibilitiesorcoursesofaction:Alternativeinuse2024/5/2940《电子信息工程专业英语教程（第5版）》Optionoftenstressesapowerorlibertytochoosethathasbeengranted,asbyanauthorityTheoptionliesbetweenacceptingthecandidatetheadministrationproposesandreconstitutingthesearchcommittee.

Preferenceindicateschoicebasedonone'svalues,bias,orpredilections:Wewereofferedourpreferenceofwines.

Alternativeinuse2024/5/2941《电子信息工程专业英语教程（第5版）》Selectionsuggestsavarietyofthingsorpersonstochoosefrom:Parentsshouldexercisecareintheirselectionofthemoviestheiryoungchildrensee.Electionespeciallyemphasizestheuseofjudgmentinchoosing:Theuniversityrecommendstheelectionofcoursesincompositionandliterature.Alternativeinuse2024/5/2942《电子信息工程专业英语教程（第5版）》Characterizedbyorinvolvingrepetition,recurrence,reiteration,orrepetitiousness.

重复的Iteration：Incomputerprogramming,aprocesswhichrepeatsthesameseriesofprocessingstepsuntilapredeterminedstateorbranchconditionisreached

循环；迭代

Iterativeindictionary2024/5/2943《电子信息工程专业英语教程（第5版）》However,sinceASICSarenotfield-programmable,theirfunctionalitycannotbeiterativelychangedorupdatedwhileinproductdevelopment.然而，ASIC无法进行现场编程；即使是在产品开发阶段，也无法对其功能进行反复修改和升级。

Iterativeintext2024/5/2944《电子信息工程专业英语教程（第5版）》Somethingthatimpedes;ahindranceoranobstruction.

障碍aspeechimpediment.Impedimentindiction