Fetal Signal Acquisition And Recognition

AbStractThe monitoring teclmology during the 28 weeks aller the woman wasPregnan is of great sighficance to the safety of the mother and the fetUS.Themonitoring of fetal movemen (FM) is an twrtan measure taken agains thefetal death. Before the fetUS dies of some iliness in the womb,the FM uSuallyaPPears to be reducing and diSaPPearing at am and then the fetal boatdisaPpears. The thae lasting frOm the regUlar FM to the disaPpearane of fetalheartbeat varies frOm l2 to 48 hours.If dris waming signal is welI obserVed andvarious measares are adoPted SUbsequnily,moSt llkely we still see an aiiveW.At the present tiIn the chief means to moultOr FM relies UPOn the IllUnbe ofFM coUnted by the Pregnan women.ms method has several disadVantages,forexamPle,the Pregnant woman needs tO lle in bed and reSt moSt of the tiIn,the FMInay be felt differendy according to differen PeOple and the countin will causeincovenience to her work and life,TherefOre,to invent a slinPlepeliable,portableelectronic monitor of FM at low coSt Which doesn't thect the life of the Pregnanwoman and enables her to monitor the FM withut lying in betw long been anmprtan problem left to be solved.The thesis Mes briefly the colleCtion and reco~on of bio-mdicalsignals in the first instane;Secondlythe circult which coUects fetal signals isdesigned and analysed.hoUgh sePahang W cUrrenwtg thelsignals,using loWpos ffiter and wtiting the POlaritythe signals of FM weradjusted.By tranSiting anolog signals to digital signals,collecting signals,thesignals wh be fortted tO the PC to be Processed by serialcoInInwhcation;Thirdi prebetaent and pattem reco~on of the signals of FMare cAned out by using integral coefficient lOwTass filterwavelet tranSfOnn tOllremove the main interference in the FM and by adding time-window to recognition with BP network;Finally the results of collecting signals and BP networks are discussed.With the help of the Third Hospital of Henan Medical University,15 A pregnant women抯 signals of FM were collected successfully by using thedesigned hardware circuit.The correct of BP network recognition about 90% by using the above measure.The results of this study have an extensive application and lay the theoretical bases for designing the FM counter.