《測控技術(shù)與儀器英語教程》Lesson 1 Periodic Signals

Lesson1PeriodicSignalsBackgroundsTexttour

LanguageinuseVocabularyStructureReading/writingtechniques11/6/20221《測控技術(shù)與儀器英語教程》BackgroundsTerminologyPeriodicsignals周期信號Time-domaindescription時域描述Polynomialexpansion多項式Taylorseries泰勒級數(shù)Fourierseries傅里葉級數(shù)Frequency-domaindescription頻域描述Orthogonalfunction正交函數(shù)Vectors矢量11/6/20222《測控技術(shù)與儀器英語教程》TexttourOutline1.1Time-DomainDescription1.2Frequency-DomainDescription

1.3OrthogonalFunctions1.4TheFourierSeries11/6/20223《測控技術(shù)與儀器英語教程》1.1Time-DomainDescriptionthemainreasonsfordiscussingperiodicsignalsthemethodoftime-domaindescription—mathematicalnotation:

(1)polynomialexpansion

(2)Taylorseries(3)Fourierseries

11/6/20224《測控技術(shù)與儀器英語教程》1.2Frequency-DomainDescriptionDefinitionTheimportanceofsinusoidalfunctioninsignaldescription11/6/20225《測控技術(shù)與儀器英語教程》1.3OrthogonalFunctions1.3.1VectorsandSignal1.3.2SignalDescriptionbySetsofOrthogonalFunction11/6/20226《測控技術(shù)與儀器英語教程》1.3.1VectorsandSignalTheintroductionofvectorsVectorsfunction11/6/20227《測控技術(shù)與儀器英語教程》1.3.2SignalDescriptionbySetsof

OrthogonalFunctionAsetofmutuallyorthogonalfunctionsTermsofawholesetoforthogonalfunctions11/6/20228《測控技術(shù)與儀器英語教程》1.4TheFourierSeries1.4.1EvaluationoftheCoefficients1.4.2ChoiceofTimeOrigin,andWaveformPower11/6/20229《測控技術(shù)與儀器英語教程》1.4.1EvaluationofthecoefficientsEvaluationofthecoefficientsHalf-wavesymmetry11/6/202210《測控技術(shù)與儀器英語教程》1.4.2ChoiceofTimeOrigin,and

WaveformPowerTheillationofParsevalbytheFourierseries11/6/202211《測控技術(shù)與儀器英語教程》LanguageinuseVocabularydescription,function,involve,component,StructureReading/writingtechniques11/6/202212《測控技術(shù)與儀器英語教程》Vocabulary11/6/202213《測控技術(shù)與儀器英語教程》Descriptionindictionary描述：描述的行為，過程或技術(shù)聲明，敘述：描述某事的聲明或敘述用畫表示：一種，一類：11/6/202214《測控技術(shù)與儀器英語教程》DescriptionintextAdiscussionoforthogonalfunctionsandoftheirvalueforthedescriptionofsignalsmaybeconvenientlyintroducedbyconsideringtheanalogybetweensignalsandvectors.通過分析信號和矢量之間的相似之處，引入用來描述信號的正交函數(shù)概念。

11/6/202215《測控技術(shù)與儀器英語教程》Description

inusepublishedadescriptionofhertravels;gaveavividdescriptionofthegame出版她的游記；關(guān)于這場比賽的生動描述Monet'setherealdescriptionsofhaystacksandwaterlilies.莫內(nèi)關(guān)于干干草垛和睡蓮的精妙描繪carsofeverysizeanddescription.各種大小和類型的小汽車11/6/202216《測控技術(shù)與儀器英語教程》Functionindictionary作用，功能職務(wù)，職責(zé)角色，工作重大聚會，慶典11/6/202217《測控技術(shù)與儀器英語教程》Functionindictionary函數(shù)：Amathematicalentitywhosevalue,thatis,thevalueofthedependentvariable,dependsinaspecifiedmanneronthevaluesofoneormoreindependentvariables,notmorethanonevalueofthedependentvariablecorrespondingtoeachpermissiblecombinationofvaluesfromtherespectiverangeoftheindependentvariables.功能：Aspecificpurposeofanentity,oritscharacteristicaction.操作：Indatacommunication,amachineactionsuchascarriagereturnorlinefeed.（如回車、換行）子程序：Asubroutinethatreturnsthevalueofasinglevariable,andthatusuallyhasasingleexit,forexample,subroutinesthatcomputemathematicalfunctions,suchassine,cosine,logarithm,orthatcomputethemaximumofasetofnumbers.11/6/202218《測控技術(shù)與儀器英語教程》FunctionintextThefactthatgreatmajorityoffunctionswhichmayusefullybeconsideredassignalsarefunctionsoflendsjustificationtothetreatmentofsignaltheoryintermsoftimeandoffrequency.

借助于時間和頻率的信號處理理論，許多常被看作是信號的函數(shù)都用來進(jìn)行信號處理。

11/6/202219《測控技術(shù)與儀器英語教程》Functioninusenormalprobabilityfunction概率正態(tài)分布函數(shù)orthonormalfunction正交函數(shù)self-correlationfunction自相關(guān)函數(shù)trigonometricalfunction三角函數(shù)unboundedfunction無界函數(shù)unitstepfunction單位階躍函數(shù)zeroBesselfunction零次貝塞爾函數(shù)functionoffirstdegree一次函數(shù)functionofmanyvariables多元函數(shù)functionofrandomvariable隨機變量函數(shù)11/6/202220《測控技術(shù)與儀器英語教程》Involveindictionary含有，包括：包括；含有…為一部分伴隨，連同：作為必需特色和影響而擁有；伴隨使?fàn)可?，卷入：使某人卷進(jìn)來；使參與密切關(guān)聯(lián)，牽連：和…直接有關(guān)，經(jīng)常指使某人擔(dān)上罪責(zé)；牽連：影響：影響或?qū)Αa(chǎn)生作用：具有或吸引…的興趣：11/6/202221《測控技術(shù)與儀器英語教程》Involveindictionary復(fù)雜：使…錯綜復(fù)雜；把…復(fù)雜化包圍；裹?。簢@或纏繞11/6/202222《測控技術(shù)與儀器英語教程》InvolveintextAcompletetime-domaindescriptionofsuchasignalinvolvesspecifyingitsvaluepreciseateveryinstantoftime.周期信號的完整的時域描述包括詳細(xì)指明其在每個瞬間的精確值。

11/6/202223《測控技術(shù)與儀器英語教程》InvolveinusewastoldthatthejobwouldinvolvetravelSeeSynonymsatinclude被告知那份工作將需要出差參見includeinvolvedthebystandersinhisdisputewiththepolice.把旁觀者牽扯進(jìn)他與警察的爭執(zhí)evidencethatinvolvedthegovernorinthescandal.州長牽連進(jìn)丑聞的證據(jù)Thematterisseriousbecauseitinvolvesyourreputation.這件事很嚴(yán)重，因為它影響到你的聲譽astorythatcompletelyinvolvedmefortherestoftheevening.一個讓我在那天晚上余下的時間完全沉浸其中的故事11/6/202224《測控技術(shù)與儀器英語教程》component

indictionary成分，系統(tǒng)的組成要素零件11/6/202225《測控技術(shù)與儀器英語教程》component

intextThereareanumberofreasonswhysignalrepresentationintermsofasetofcomponentsinusoidalwavesoccupiessuchacentralroleinsignalanalysis.有許多理由可以說明為什么在信號分析時信號成份中正弦波起到如此重要的作用。11/6/202226《測控技術(shù)與儀器英語教程》component

inuseOneoftheessential,functioningpartsofasubsystemorequipment,possiblyaself-containedelement,oracombinationofparts,assemblies,attachments,oraccessories.

子系統(tǒng)或設(shè)備的基本組成部分或功能部件之中的一個。它可以是一種獨立的元件,也可以是若干部件、裝配件或附件的組合。Insoftwareengineering,abasicpartofasystemorprogram.Forexample,theschedulerorsupervisorofan