简介：Nowadays,numerouscommercialelectrocardiographs(ECG)have500Hzoutputsamplingrate,i.e.,2mscorrespondingsamplinginterval.Medicalworkerswhohavenobackgroundofsignalprocessingmayworryaboutwhethersuchlow500Hzoutputsamplingratedatacouldsupporthigh-precisionestimationofelectrocardiogramparametersbybeingup-sampled.Withintentiontoclarifytheproblemtothemedicalworkers,thispapertakessomesimulatingexperimenttoillustrateit.TheexperimentchosetheRRintervalandRpeakamplitudeasrepresentativeparameterstobeestimated.Theobtainedresultswereasfollows:forRRintervalparameter,itsestimationerrorcanbeloweredtobelow0.3msbyup-sampling;forRpeakamplitude,itsestimationerrorcanbereducedtobelow2.0μVbyup-sampling.ItisbelievedthatotherECGparameterestimationcanalsobeimprovedsimilarlybyup-sampling500Hzdata.

简介：Inordertoanalyzetheexperimentalcardiovascularsignalwithhighaccuracy,asystem,integratingreal-timemonitoringandoff-linefurtheranalysis,wasdevelopedandverified.Thedesign,dataprocessingandanalysismethodsaswellastestingresultsaredescribed.With5samplingfrequencychoicesand8channeldataacquisition,thesystemachievedhighperformancesinbeat-to-beatmonitoring,signalprocessingandanalysis.Testswerecarriedouttovalidateitsperformanceinreal-timemonitoring,effectivenessofdigitalfilters,QRSandbloodpressuredetectionreliability,andRR-intervaltimingaccuracy.TheQRSdetectionratewasatleast99.46%fortherecordswithfewnoisesfromMIT-BIHarrhythmiadatabaseusingthealgorithmforreal-timemonitoring,andnolessthan96.43%fortherecordswithsomenoises.Intheconditionthatnoiseamplitudelevelswerelessthan80%,thestandarddeviationsforRR-intervaltimingwerelessthan1mswithageneratedECGcorruptedwithvariousnoisesfromMIT-BmNoiseStressTestDatabase.Besides,thesystemisopenforfunctionexpansiontomeetfurtherstudyspecificneeds.