标签: impulse

FPGA平台上Adaboost算法的ImpulseC实现

Alinearsystem'scharacteristicsarecompletelyspecifiedbythesystem'simpulseresponse,asgovernedbythemathematicsofconvolution.Thisisthebasisofmanysignalprocessingtechniques.Forexample:Digitalfiltersarecreatedbydesigninganappropriateimpulseresponse.Enemyaircraftaredetectedwithradarbyanalyzingameasuredimpulseresponse.Echosuppressioninlongdistancetelephonecallsisaccomplishedbycreatinganimpulseresponsethatcounteractstheimpulseresponseofthereverberation.Thelistgoesonandon.Thischapterexpandsonthepropertiesandusageofconvolutioninseveralareas.First,severalcommonimpulseresponsesarediscussed.Second,methodsarepresentedfordealingwithcascadeandparallelcombinationsoflinearsystems.Third,thetechniqueofcorrelationisintroduced.Fourth,anastyproblemwithconvolutionisexamined,thecomputationtimecanbeunacceptablylongusingconventionalalgorithmsandcomputers.CHAPTERPropertiesofConvolution7Alinearsystem'scharacteristicsarecompletelyspecifiedbythesystem'simpulseresponse,asgovernedbythemathematicsofconvolution.Thisisthebasisofmanysignalprocessingtechniques.Forexample:Digitalfiltersarecreatedbydesigninganappropriateimpulseresponse.Enemyaircraftaredetectedwithradarbyanalyzingameasuredimpulseresponse.Echosuppressioninlongdistancetelephonecallsisaccomplishedbycreatinganimpulseresponsethatcounteractstheimpulseresponseofthereverberation.Thelistgoesonandon.Thischapterexpandsonthepropertiesandusageofconvolutioninseveralareas.First,severalcommonimpulseresponsesarediscussed.Second,methodsarepresentedfor……

Convolutionisamathematicalwayofcombiningtwosignalstoformathirdsignal.ItisthesinglemostimportanttechniqueinDigitalSignalProcessing.Usingthestrategyofimpulsedecomposition,systemsaredescribedbyasignalcalledtheimpulseresponse.Convolutionisimportantbecauseitrelatesthethreesignalsofinterest:theinputsignal,theoutputsignal,andtheimpulseresponse.Thischapterpresentsconvolutionfromtwodifferentviewpoints,calledtheinputsidealgorithmandtheoutputsidealgorithm.ConvolutionprovidesthemathematicalframeworkforDSP;thereisnothingmoreimportantinthisbook.CHAPTERConvolution6Convolutionisamathematicalwayofcombiningtwosignalstoformathirdsignal.ItisthesinglemostimportanttechniqueinDigitalSignalProcessing.Usingthestrategyofimpulsedecomposition,systemsaredescribedbyasignalcalledtheimpulseresponse.Convolutionisimportantbecauseitrelatesthethreesignalsofinterest:theinputsignal,theoutputsignal,andtheimpulseresponse.Thischapterpresentsconvolutionfromtwodifferentviewpoints,calledtheinputsidealgorithmandtheoutputsidealgorithm.ConvolutionprovidesthemathematicalframeworkforDSP;thereisnothingmoreimportantinthisbook.TheDeltaFunctionandImpulseResponseThepreviouschapterdescribesh……