HRTF SIMULATIONS THROUGH ACOUSTIC RAYTRACING

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1、HRTFSIMULATIONSTHROUGHACOUSTICRAYTRACINGNiklasRober,SvenAndresandMaicMasuch¨DepartmentofSimulationandGraphics,SchoolofComputingScience,Otto-von-Guericke-UniversityMagdeburg,GermanyABSTRACTchangesduetoatmosphericdiffusionandabsorption.Anad-ditionaleffectthatsupports3Dsoundperce

2、ptionaredynamicThedeterminationofindividualhead-relatedtransferfunc-cues,causedbyeitherorbothsoundsourceorheadandbodytions(HRTF)for3Dsoundrenderingremainsachallengingmovement.task.ThemeasurementofindividualHRTFsisnotpractical,duetotherequirementsofheavyandexpensiveequipmentAll

3、acousticcuesthatareusedtodecodespatialinforma-aswellasananechoicchamberforthemeasurementitself.tionaredirectlyencodedinthebinauralsignal.Theover-Sometechniqueshavebeenproposedtoindividualizegeneralalleffectofthehumanbodyisspecifiedbythehead-relatedHRTFs,butstillmanyrestrictions

4、apply.transferfunction(HRTF)andincorporatesinterauraldiffer-encesaswellasspectralcuesandisthereforeveryeffectiveThisworkdescribesanalternativeapproachformeasur-formodelling3Dvirtualsoundsources.TheHRTFisafunc-ingindividualHRTFsthroughacousticraytracing.Wede-tionofdirection,dis

5、tanceandfrequencyandusuallymea-signedasystemthatisabletoloadindividual3Dmeshessuredinananechoicenvironmentusingelaborateandexpen-andperformanHRIRsimulation.Although,wemainlyfocussiveequipment[3].ItisdefinedastheFouriertransformofonspectralreflections,wealsosimulatefrequencydepen

6、denttheactuallymeasuredhead-relatedimpulseresponse(HRIR)diffraction,absorptionandtransmissioneffects.andindividualforeveryperson[4].Recentresearchhasfo-cusedontechniquestodesigngeneralizedHRTFs,butalso1.INTRODUCTIONtoindividualizemeasuredHRTFstofitthelistenersneeds[5],[6].Butth

7、esetechniquesstilloftencausefront/backThehumanhearingsystemhasremarkableabilitiesiniden-confusionsandarefarawayfromtheaccuracyofindividualtifyingsoundsourcepositionsin3Dspace.AlthoughthisHRTFs.Numericalsimulationshavebeenemployedtocalcu-processisoftenaidedbyvisualguidance,know

8、ledgeandlatetheHRIRthroughFEMandBEMtechniques,buttheseotherse