《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(hào)Time-domaindescription時(shí)域描述Polynomialexpansion多項(xiàng)式Taylorseries泰勒級(jí)數(shù)Fourierseries傅里葉級(jí)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(hào)和矢量之間的相似之處，引入用來描述信號(hào)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(dòng)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(huì)，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(shí)間和頻率的信號(hào)處理理論，許多常被看作是信號(hào)的函數(shù)都用來進(jìn)行信號(hào)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(jī)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)可妫砣耄菏鼓橙司磉M(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(cuò)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(hào)的完整的時(shí)域描述包括詳細(xì)指明其在每個(gè)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?yàn)樗绊懙侥愕穆曌u(yù)astorythatcompletelyinvolvedmefortherestoftheevening.一個(gè)讓我在那天晚上余下的時(shí)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(hào)分析時(shí)信號(hào)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(gè)。它可以是一種獨(dú)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