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1、Unit1DigitalSignalProcessing(DSP)Havingheardalotaboutdigitalsignalprocessing(DSP)technology,youmayhavewantedtofindoutwhatcanbedonewithDSP,investigatewhyDSPispreferredtoanalogcircuitryformanytypesofoperations,anddiscoverhowtolearnenoughtodesignyourownDSPsystem.Thisar
2、ticle,thefirstofaseries,isanopportunitytotakeasubstantialfirststeptowardsfindinganswerstoyourquestion.ThisseriesisanintroductiontoDSPtopicsfromthepointofviewofanalogsystemdesignersseekingadditionaltoolsforhandlinganalogsignals.Designersreadingthisseriescanlearnabout
3、thepossibilitiesofDSPtodealwithanalogsignalsandwheretofindadditionalsourcesofinformationandassistance・1.1WhatIsDSP?Inbrief,DSPsarcprocessorsormicrocomputerswhosehardware,software,andinstructionsetsareoptimizedforhigh-speednumericprocessingapplications一anessentialfor
4、processingdigitaldatarepresentinganalogsignalinrealtime・WhataDSPdoesisstraightforward・Whenactingasadigitalfilter,forexample,theDSPreceivesdigitalvaluesbasedonsamplesofasignal,calculatestheresultofafilterfunctionoperatingonthesevalues,andprovidesdigitalvaluesthatpres
5、entthefilteroutput;itcanalsoprovidesystemcontrolsignalbasedonpropertiesofthisvalues.TheDSP'shigh-speedarithmeticandlogicalhardwareisprogrammedtorapidlyexecutealgorithmsmodelingthefiltertransformation.Thecombinationofdesignelementsarithmeticoperators,memoryhandling,i
6、nstructionset,parallelism,dataaddressingthatprovidethisabilityformsthekeydifferencebetweenreal-timesignalandDSPcalculationspeedprovidessomebackgroundonjusthowspecialthiscombinationis.Thereal-timesignalcomestotheDSPasatrainofindividualsamplesfromananalog-to-digitalco
7、nverter(ADC).Todofilteringinreal-time,theDSPmustcompleteallthecalculationsandoperationsrequiredforprocessingeachsample(usuallyupdatingaprocessinvolvingmanyprevioussample)beforethenextsamplearrives.Toperformhigh-orderfilteringofreal-worldsignalshavingsignificantfrequ
8、encycontentcallsforreallyfastprocessors.1.2WhyuseaDSP?TogetanideaofthetypeofcalculationsaDSPdoesandgetanideaofhowananalogcircuitcompareswi
