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firstorderdigitalfilters--audiocookbookFirstOrderDigitalFilters--AnAudioCookbookApplicationNoteAN-11IntroductionThesimplestdigitalfiltersarefirstorderFIRandIIRfilters,singlyorincascade.Whilenotaspowerfulashigherorderfilters,theyareneverthelessofconsiderableinterestinaudioforbassandtreblecontrols,DCoffsetremoval,highpassfilters,andlowpassfilters.AlsoappealingisthelowcomputationalburdenthatfirstorderfiltersplaceonDSPresources.Despitethesimplicityofthefirstorderfilter,theDSPliteratureisnotforthcomingwithasimplemethodologythatallowsforcookbookdesign.ThemethodthatIpresenthereappearsinanarticlefrom1978byHamandisbasedonrelatingaprototypeanalogfiltertothedesireddigitalfilterusingthetechniqueofimpulseinvariance.……