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1、基于dsp的f.i.r低通滤波器设计Title:theuseofDSPFIRfilterdesignDigitalprocessor(DSP)hasastrongdataprocessingabi1ity.Ithasawiderangeofapplicationsinhigh-speeddigitalsignalprocessing,suchasdigitalfiltering,audioprocessing,imageprocessingandsoon.Comparedwithanalogfilters,digitalfiltersdo
2、notdrift,andcanhandlelow-frequencysignals,thefrequencyresponsecharacteristicscanbemadeveryclosetotheidealcharacteristics,andtheaccuracycanbeveryhigh,easyintegration.ThecharacteristicsoftheuseofDSPchipprogrammabledigitalfiltercanberealizedbymodifyingtheparameterofthefilter
3、isveryeasytochange,thefollowingisdesignedusingTMS320VC54xDSPchipFIRdigitalfilter・DesignpurposeInapracticalapplicationsystem,therearealwaysavarietyofinterference,sointhesystemdesign,thequalityofthefilterwilldirectlyaffecttheperformanceofthesystem・DigitalprocessingusingDSPc
4、anbeusedtosampleamixedsignalsourcewithnoiseandsignal,andthenextractthenoisebydigitalfilteringtoextractusefulsignals・Therefore,digitalfilteristhemostbasicapplicationfieldofDSP,andfamiliarwithDSPbaseddigitalfiltercanprovideagoodfoundationforthedevelopmentofDSPapplicationsys
5、tem・Technicalindex1,thedigitalfilterfrequencyparametersareasfollows:thepassbandcutofffrequencyforbandpassboundarypointsandtransitionzone,downtotheprescribedminimumatthepointofsignalgain.Thestopbandcutofffrequencywithboundarypointsandtransitionzoneforresistance,downtothepr
6、escribedminimumatthepointofsignalattenuation.Theturningfrequency:attenuationto1/2signalpower(about3dB)whenthefrequency,inmanycases,oftenwithFCasthebandorthestopbandcutofffrequency・Whenthecircuitisnotlossy,thenaturalfrequencyisitsresonantfrequency,andcomplexcircuitsoftenha
7、vemultiplenaturalfrequencies・1,gainandlossThegainofthefilterinthepassbandisnotconstant・Forlowpassfilters,passbandgaingenerallyreferstogainwhenOmega=0;highpassreferstogainwhenomega二H-infinity;bandrulereferstogainatcenterfrequency・Thebandstopfilter,shouldgivethestopbandatte
8、nuation,attenuationisdefinedasthereciprocalofthegain.Thechangeofpassbandgainreferstothemaximumch
