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1、ENGINEERINGREPORTSTheoryandDesignofaDigitalAudioSignalProcessorforHomeUse*DAVIDGRIESINGERLexicon,Waltham,MA02154,USAStudiesofconcert-hallacousticshaveshownthatenergyfromlateralreflectionsisparticularlyimportantinlistenersatisfactionandinvolvement.Adigitalsign
2、alprocessorhasbeendevelopedforhomeplaybackwhichdramaticallyincreasesthelateralsoundenergyfromrecordedmusicandfilms,bothwithandwithoutmultipleloudspeakers.0INTRODUCTIONlistenerspreferhallswithsignificantsidewaysreflectedenergy.Theseresearchersuseddifferentmeth
3、odstoBringingtheprocessordescribedinthisreporttostudytheeffectoflateralreflectionsonlistenerpref-lifewasagreatdealoffunandhardworkformanyerence.Barronusedalaboratoryapproachinwhichapeople.Theauthor'smajortaskwastodecidewhatlistenerwassurroundedbyloudspeakersi
4、nananechoicsuchaprocessorcoulddotoreallychangethewaychamber.Variousdelayedsignalswereplayedfromrecordedsoundwasheardinthehome,anddevelopdifferentdirections,andthelisteners'responsesweresolutionstotheseproblemsinsoftware.Itisontheseanalyzed.Thisisalsothemethod
5、employedbyBlauertquestionsandsolutionsthatthisengineeringreportwill(1986).Bothresearchersfoundthatlateralreflectionsdwell,werevitaltocreatingasenseofspaciousnessoren-Tocompletethetaskwehadtodrawonourownvelopment,whichBarronnamedspatialimpression(SI).researcha
6、ndthatofmanyothers.WeneededtofindBarronandBlauerthaveanalyzedtheeffectsofdirec-outjustwhatisreallyinvolvedinlisteningtorecordedtion,delay,andfrequencycontentontheamountofSI.sound,identifythecharacteristicsofsoundandspatialSchroederusedinterauralcrosstaikelimi
7、nationtohearingwhichmaximizelisteningpleasure,andthenplaybinauralrecordingsmadeinactualconcerthalls.useourdigitaltechnologytobringthesecharacteristicsThistechniquealloweddifferenthallstobecomparedtothehome.Thesolutionsturnedouttobemultifaceted,directly.Hefoun
8、dthat(amongotherparameters,suchThereisnoonetechniquethatworksinallsitua-asreverberationtime)listenerspreferredhallswheretions--buttherearemany,botholdandnew,thatcantheinterauralcorrelatio
