基于Microcap的入耳式耳机仿真-英文版

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1、InsertHeadsetSimulationCainGuInBrief•ThissimulationisbasedonElectro-Mechanical-AcousticAnalogiestheory,whilethetubesaretreatedastransferline.•TheacousticsdampingoftubeinnersurfaceisnotconsideredandallthemeshestreatedasResistance.•Thesimulationresultiscorrectedbyt

2、estresult,justtoshowthetrendsandforreference.RubberCavityCanalCavityBackvolume1CCARACCBackvolume2AB1CRearMeshAB2RABIEC711ArtificialEarwithEarCanalTubeL+CATATFrontVolume1FrontMeshFrontVolume2CRAFCAF1AF21.Thevolumeinfrontofdiaphragmshouldbeconsidered.2.Theacoustice

3、lementsofthereallikeC,RandCcanbetreatedasdumpAB1ABAB2elements,otherslikeFrontVolume,TubeandCavitiescan’tbetreatedasdumpblock.DataofWH205•Backvolume1:0.4ccm•Backvolume2:0.05ccm•Frontvolume1:0.015ccm•Frontvolume2:0.045ccm•Tube:Ø3.1mmX3.7mm•RubberCavity:Ø5.6mmX4.9mm

4、(Rough)•CanalCavity:Ø7.5mmX4mm(Rough)•fofdriver:665Hz0SimulationCiruitOriginalSettingBackVolume1ChangesBackvolume1changesfrom0.8ccmto0.2ccmRearMeshChangesRearMeshchangesfromthintothick.Thisalsoaffectthepeakaround3kHzBackVolume2ChangesActuallythisvolumeisinsidethe

5、driver,combinetogetherwithMmstodefinefsofdriver.Driver’sRMSChangesTheRmsonlyaffectsthepeakaround3kHz(fs).FrontMeshChangesChangetheFrontMeshfromthintothick.TheMeshcandampallthepeaks.FrontVolumeChangesHereFrontVolume=FrontVolume1+FrontVolume2FrontVolumechangesfrom4

6、0mm3,85mm3and100mm3TubeDiameterChangesTheTubeinnerDiameterchangesfrom2mmto3.1mmand4.5mm.TubeLengthChangesTheTubeLengthchangefrom3.7mmto4.5mmand5.3mm.RubberCavityLengthChangeRubberCavitylengthchangesfrom5mmto6mmand7mm.EarCanalLengthChangesEarCanalLengthchangesfrom

7、2mmto4mmand6mm,thatdependsonhowdeeptheheadphoneinsertintoearcanal,ergonomicsrelated.Comparetotheearrubberandtubelengthchange,thislengthaffecttheSPLaround8k-9kHzmuch.Simulationresultofdiff.conditions—WH205—HP5B3.0—SmallTubeOriginal—SmallTubeandSmallFrontVolume—Imp

8、rovement(SmallerFrontVolume)WH205andHP5areinsamelevel,thedifferencein3kHzduetothedriver’smechanicaldampingRmsanddifferencein9kHz.Smalldiametertubecan’tbeuseddu