简介：Thispaperdealswithinternallygeneratednoiseofbioelectricamplifiersthatareusuallyusedforprocessingofbioelectricevents.Themainpurposeofthispaperistopresentaprocedureforanalysisoftheeffectsofinternalnoisegeneratedbytheactivecircuitsandtoevaluatetheoutputnoiseoftheauthor'snewdesignedbioelectricamplifierthatcausedbyinternaleffectstotheamplifiercircuititselfinordertocompareitwiththenoisegeneratedbyconventionalamplifiers.Theobtainedanalysisresultsofinternallygeneratednoiseshowedthatthetotaloutputnoiseofbioelectricactivecircuitsdoesnotincreasewhensomeoftheirresistorshavealargervalue.Thisbehavioriscausedbythedifferenttransferfunctionsforthesignalandtherespectivenoisesourcesassociatedwiththeseresistors.Moreover,thenewdesignedbioelectricamplifierhasanoutputnoiselessthanthatforconventionalamplifiers.Theobtainedanalysisresultswerealsoexperimentallyverifiedandthefinalconclusionsweredrawn.

简介：Atrialfibrillation（AF）isacommoncardiacrhythmdisturbancethatin-creasesinprevalencewithadvancingage.TogettherealtimelocationoftherelatedkeylesionsisofgreatsignificancetotreatandabolishAF.Two-dimensionalfiniteelementmethodwasadoptedtosimulatetheleadfield.Basedontheacoustoelectriceffectandthereciprocaltheory,thesourcedensityofthecurrentfieldwascalculated,thusdeterminingthepreciselocationofthecurrentsourceandsink.Resultsshowthatthesimulatedpositioningprecisionofcurrentsourceandsinkiswithinsubmillimetreonlyusingapairofrecordingelectrode.Thisworkimpliesthatitispromisingtolocatethekeylesionsfrommessyfibrillationusingtheacoustoelectriceffectmethod.