Digital signal processing - Wikipedia, the free encyclopedia

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1、DigitalsignalprocessingFromWikipedia,thefreeencyclopediaJumpto:navigation,searchThisarticleneedsadditionalcitationsforverification.Pleasehelpimprovethisarticlebyaddingcitationstoreliablesources.Unsourcedmaterialmaybechallengedandremoved.(May2008)Digitalsignalprocessing(DSP)isconce

2、rnedwiththerepresentationofdiscretetimesignalsbyasequenceofnumbersorsymbolsandtheprocessingofthesesignals.Digitalsignalprocessingandanalogsignalprocessingaresubfieldsofsignalprocessing.DSPincludessubfieldslike:audioandspeechsignalprocessing,sonarandradarsignalprocessing,sensorarra

3、yprocessing,spectralestimation,statisticalsignalprocessing,digitalimageprocessing,signalprocessingforcommunications,controlofsystems,biomedicalsignalprocessing,seismicdataprocessing,etc.ThegoalofDSPisusuallytomeasure,filterand/orcompresscontinuousreal-worldanalogsignals.Thefirstst

4、episusuallytoconvertthesignalfromananalogtoadigitalform,bysamplingitusingananalog-to-digitalconverter(ADC),whichturnstheanalogsignalintoastreamofnumbers.However,often,therequiredoutputsignalisanotheranalogoutputsignal,whichrequiresadigital-to-analogconverter(DAC).Evenifthisprocess

5、ismorecomplexthananalogprocessingandhasadiscretevaluerange,theapplicationofcomputationalpowertodigitalsignalprocessingallowsformanyadvantagesoveranalogprocessinginmanyapplications,suchaserrordetectionandcorrectionintransmissionaswellasdata[1]compression.DSPalgorithmshavelongbeenru

6、nonstandardcomputers,onspecializedprocessorscalleddigitalsignalprocessoronpurpose-builthardwaresuchasapplication-specificintegratedcircuit(ASICs).Todaythereareadditionaltechnologiesusedfordigitalsignalprocessingincludingmorepowerfulgeneralpurposemicroprocessors,field-programmableg

7、atearrays(FPGAs),digitalsignalcontrollers(mostlyforindustrialappssuchasmotorcontrol),[2]andstreamprocessors,amongothers.Contents1Signalsampling2DSPdomainso2.1Timeandspacedomainso2.2Frequencydomaino2.3Z-planeanalysiso2.4Wavelet3Applications4Implementation5Techniques6Relatedfi

8、elds7References8Furtherreading[