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1、30thAnnualInternationalIEEEEMBSConferenceVancouver,BritishColumbia,Canada,August20-24,2008ANewNoiseReductionMethodforOscillometricBloodPressureMeasurementHyun-SeokChoi,Hyoun-SeokMyoung,Hyo-KiLee,Ho-DongParkandKyoung-JoungLeeoscillationtobaseline[3]oruseslinearinterpolation[4].Abstract—Inthispaper,an
2、ewnoisereductionmethodwasproposedforoscillometricbloodpressuremeasurement.TheThereforethereexistsapossibilityforlosingtheoscillationproposedmethodusesacapacitivesensorandanadaptivefilterinformationiftheoscillationoverlapswiththenoise.Thelosstominimizebloodpressuremeasurementerror.Noisesuchasoftheosc
3、illationinformationwouldcausethebloodpressureundesiredexternalpressureappliedtocuffwasfocusedon.measurementerror.Threetypesofthedistortedoscillationsignals(nooverlap,non-consecutiveoverlap,consecutiveoverlapbetweenthenoiseInthispaper,themethodusingacapacitancesensorandanandtheoscillation)wereusedtoc
4、omparetheconventionaladaptivefilterwasproposedtominimizethebloodpressuremethodusinglinearinterpolationandtheproposedmethodmeasurementerror.Thecapacitancesensoraimstodetecttheusingtheadaptivefilter.Theproposedmethodoutperformeddistortedoscillation,andtheadaptivefilterplaysaroleintheconventionalmethod
5、inthecaseofconsecutiveoverlaprestorethedistortedoscillation.betweenthenoiseandtheoscillation.Theproposedmethodcouldbeusefulformeasuringbloodpressureinsuchanoisyenvironmentthatthesubjectisbeingtransported.II.METHODSA.TheproposedhardwaresystemI.INTRODUCTIONFig.1showsblockdiagramoftheproposedhardwareBL
6、OODpressureisanimportantsignaltoevaluatesystemcomprisingofcapacitivesensormodule,pressurecardiovascularsystem.Thereareanauscultatorysensormodule,andtransmissionmodule.Thecapacitivemeasurementandanoscillometricmeasurementtomeasuresensormoduleacquiresavariationofcapacitancethebloodpressureinvasively.T
7、heformerandthelattermakesynchronouswiththenoisesuchastheundesiredexternaluseofkorotkoffsoundandoscillationrespectively.Thepressureappliedtothecuff.Thepressuresensormodulekorotkoffsoundoriginatesfromtu
