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1、Chapter3SignalSystem&SignalProcessing电子信息与通信工程专业英语3.1SignalandSystem3.2DigitalSignalProcessing3.3SpeechSignalProcessing电子信息与通信工程专业英语TEXT3.1SignalandSystemSimplyintroductionofthemathematicalrepresentationsofcontinuous-timeanddiscrete-timesignalsandsystems,andtheconce
2、ptsofsignalenergyandpower.电子信息与通信工程专业英语1.Continuous-timeanddiscrete-timesignals2.Continuous-timeanddiscrete-timesystems3.Somepropertiesofdigitalsignalsystem4.Signalenergyandpower电子信息与通信工程专业英语Terminologyaeronauticsn.航空学,航空术astronauticsn.太空航空学seismologyn.地震学meteorolog
3、icadj.气象的,气象学的profilen.剖面,侧面,外形,轮廓conventionn.大会,协定,习俗,惯例terminologyn.术语学electromechanicaladj.[机]电动机械的,机电的,电机的automotiveadj.汽车的,自动推进的vehiclen.交通工具,车辆high-fidelity高保真tonen.音调,音质,语调电子信息与通信工程专业英语1.Continuous-timeanddiscrete-timesignalsSignalsarerepresentedmathematicall
4、yasfunctionsofoneormoreindependentvariables:eg.1:aspeechsignalcanberepresentedmathematicallybyacousticpressureasafunctionoftime电子信息与通信工程专业英语eg.2apicturecanberepresentedbybrightnessasafunctionoftwospatialvariables电子信息与通信工程专业英语Todistinguishbetweencontinuous-timeanddis
5、crete-timesignals,wewillusethesymbolttodenotethecontinuous-timeindependentvariablewhichisenclosedinparentheses(.)andntodenotethediscrete-timeindependentvariableinbrackets[.].电子信息与通信工程专业英语Illustrationsofacontinuous-timesignalandadiscrete-timesignalareshowninFig.3-4.(
6、a)(b)Fig.3-4Graphicalrepresentationsof(a)continuous-timeand(b)discrete-timesignals电子信息与通信工程专业英语Physicalsystemsinthebroadestsenseareaninterconnectionofcomponents,devices,orsubsystems.Incontextrangingfromsignalprocessingandcommunicationstoelectromechanicalmotors,autom
7、otivevehicles,andchemical-processingplants,asystemcanbeviewedasaprocessinwhichinputsignalsare2.Continuous-timeanddiscrete-timesystems电子信息与通信工程专业英语transformedbythesystemorcausethesystemtorespondinsomeway,resultinginothersignalsasoutputs.Forexample,ahigh-fidelitysyste
8、mtakesarecordedaudiosignalandgeneratesareproductionofthatsignal.Ifthehi-fisystemhastonecontrols,wecanchangethetonalqualityofthereproduceds
