专业英语(测控专业)

Lession1Functioninuse•normalprobabilityfunction概率正态分布函数•orthonormalfunction正交函数•self-correlationfunction自相关函数•trigonometricalfunction三角函数•unboundedfunction无界函数•unitstepfunction单位阶跃函数•zeroBesselfunction零次贝塞尔函数•functionoffirstdegree一次函数•functionofmanyvariables多元函数•functionofrandomvariable随机变量函数Periodicsignals周期信号Time-domaindescription时域描述Polynomialexpansion多项式Taylorseries泰勒级数Fourierseries傅里叶级数Frequency-domaindescription频域描述Orthogonalfunction正交函数Vectors矢量Descriptionindictionary•描述：描述的行为，过程或技术•声明，叙述：描述某事的声明或叙述•用画表示：•一种，一类：Descriptionintext•Adiscussionoforthogonalfunctionsandoftheirvalueforthedescriptionofsignalsmaybeconvenientlyintroducedbyconsideringtheanalogybetweensignalsandvectors.•通过分析信号和矢量之间的相似之处，引入用来描述信号的正交函数概念。Descriptioninuse•publishedadescriptionofhertravels;gaveavividdescriptionofthegame•出版她的游记；关于这场比赛的生动描述•Monet'setherealdescriptionsofhaystacksandwaterlilies.•莫内关于干干草垛和睡莲的精妙描绘•carsofeverysizeanddescription.•各种大小和类型的小汽车Functionindictionary•作用，功能•职务，职责•角色，工作•重大聚会，庆典•函数：功能：•操作：子程序•Functionintext•Thefactthatgreatmajorityoffunctionswhichmayusefullybeconsideredassignalsarefunctionsoflendsjustificationtothetreatmentofsignaltheoryintermsoftimeandoffrequency.•借助于时间和频率的信号处理理论，许多常被看作是信号的函数都用来进行信号处理。Involveindictionary•含有，包括：包括；含有…为一部分•伴随，连同：作为必需特色和影响而拥有；伴随•使牵涉，卷入：使某人卷进来；使参与•密切关联，牵连：和…直接有关，经常指使某人担上罪责；牵连：•影响：影响或对…产生作用：•具有或吸引…的兴趣：•复杂：使…错综复杂；把…复杂化•包围；裹住：围绕或缠绕Involveintext•Acompletetime-domaindescriptionofsuchasignalinvolvesspecifyingitsvaluepreciseateveryinstantoftime.•周期信号的完整的时域描述包括详细指明其在每个瞬间的精确值。Involveinuse•wastoldthatthejobwouldinvolvetravelSeeSynonymsatinclude•被告知那份工作将需要出差参见include•involvedthebystandersinhisdisputewiththepolice.•把旁观者牵扯进他与警察的争执•evidencethatinvolvedthegovernorinthescandal.•州长牵连进丑闻的证据•Thematterisseriousbecauseitinvolvesyourreputation.•这件事很严重，因为它影响到你的声誉•astorythatcompletelyinvolvedmefortherestoftheevening.•一个让我在那天晚上余下的时间完全沉浸其中的故事componentindictionary•成分，系统的组成要素,零件componentintext•Thereareanumberofreasonswhysignalrepresentationintermsofasetofcomponentsinusoidalwavesoccupiessuchacentralroleinsignalanalysis.•有许多理由可以说明为什么在信号分析时信号成份中正弦波起到如此重要的作用。componentinuse•Oneoftheessential,functioningpartsofasubsystemorequipment,possiblyaself-containedelement,oracombinationofparts,assemblies,attachments,oraccessories.子系统或设备的基本组成部分或功能部件之中的一个。它可以是一种独立的元件,也可以是若干部件、装配件或附件的组合。•Insoftwareengineering,abasicpartofasystemorprogram.Forexample,theschedulerorsupervisorofanoperatingsystem.在软件工程中,系统或程序的基本部分。例如,操作系统中的调度程序或管理程序。componentinuse•chrominancesignalcomponent彩色［色度］信号分量•circuitcomponent电路元件1）Thetheoreticaltreatmentofperiodicwaveformsassumesthatthisexactrepetitionisextendedthroughoutalltime,bothpastandfuture.周期波形的理论假定这种精确的重复延伸到整个时间轴上，不管过去还是未来。2）Generallyspeaking,thefittotheactualwaveformisgoodintheregionofthepointchosen,butrapidlydeterioratestotheeitherside.一般来说，在选定点的区间内，级数与实际波形很吻合，但是在区间外，这种情况就会迅速恶化。3）itsvaluepreciseateveryinstantoftime每个瞬间的精确值•4）asnumberofpolynomialterms随着多项式幂的加大•5）Thereareanumberofreasonswhysignalrepresentationintermsofasetofcomponentsinusoidalwavesoccupiessuchacentralroleinsignalanalysis.有许多理由可以说明为什么在信号分析时信号成分中正弦波起到如此重要的作用。•6）tobeminimizedinacertainimportantsense降到最低•7）Alargeandextremelyimportantclassofelectricalandmechanicalsystems,knownas’linearsystems’,respondssinusoidallywhendrivenbyasinusoidaldisturbingfunctionofanyfrequency.一个庞大的而且极其重要的机电系统，也称作线性系统，加上任何频率的正弦干扰后都会得到正弦响应。•8）Avectorisspecifiedbothbyitsmagnitudeanddirection,familiarexamplesbeingforceandvelocity.矢量用大小和方向来描述，例如力和速度。•9）Signaldescriptionbysetsoforthogonalfunction利用正交函数集描述信号10）Supposethatwehaveapproximatedasignaloveracertainintervalbythefunctionsothatthemeansquareerrorisminimized.假定我们在一定区间上通过函数已经得到一个近似的信号，并且均方差达到最小。Excises•简谐信号是最简单和最重要的周期信号。任意一个周期信号可以用简谐信号来表达，两者之间联系的桥梁是傅立叶级数，所以傅立叶级数是周期信号分析的理论基础。•Harmonicsignalisthesimplestandthemostimportantperiodicsignal.HarmonicsignalcanbearbitrarilyusedtoexpressaperiodicsignalandFourierseriesisarelatingbridgebetweenthem,soFourierseriesisthetheoreticalfoundationofanalyzingperiodicsignal.•一个在时域上显得很复杂的信号，将其变换或映射到频域（包括s和z域），就能够分解为非常简单的基本信号形式，进行分析和求解。•Onesignalwhichisaverycomplicatedsignalinthetimedomainistransformedormappedotothefrequencydomain(includingsandzdomain),itcanbedecomposedintoverysimpleformsofthebasicsignalforanalysisandsolution.••3、频谱是由不连续的谱线组成，每条谱线代表一个谐波分量。这种频谱称为离散频谱。谱线之间的间隔等于基波频率的整数倍。即频谱中的每一条谱线只能出现在基波频率的整数倍上，各谐波的频率都是基波频率的整数倍。•Thespectrumiscomposedofdiscontinuouslinesandeachlineisarepresentativeofeachharmoniccomponent.Thisspectrumiscalleddiscretespectrum.Theintervalbetweenthelinesisequaltointegraltimesofthefundamentalfrequency.Eachlineofthespectrumappearsinintegraltimesofthefundamentalfrequency,thefrequencyoftheharmonicsareintegraltimesoffundamentalfrequency.4.TheFourierseriesisaparticulartypeoforthogonalseriesrepresentationthatisveryusefulinsolvingengineeringproblems,especialcommunicationproblems.Theorthogonalfunctionsthatareeithersinusoids,or,equivalently,complexexponentialfunctions.傅立叶级数是一个特定类型的正交级数的表达式，这在解决工程问题是非常有用的，尤其是通信问题。正交函数要么是正弦曲线，或等效为复指数函数。5.Forperiodicwaveforms,theFourierseriesrepres