The Signal's Pick-up And Process Of Fetus' Heartheat

Enhance quantity of borned child, lower the death rate of pregnant woman and newborn child is an important mission of woman and child health care. November 28 of 1994, the World Health Organization an official gazette that word Geneva announce says inside, the world reaches annually 600,000 women, death because of pregnancy with give birth to baby, namely every minute over one person.In addition, reach annually 3,000,000 for still-born baby, have moreover 300 ten thousand infantses are being born on dying with in the week.How to guarantee the health of pregnancy women and infantses, give the medical science engineering of the whole world to put forward a rigorous challenge with medical workers, also press the development of the obstetrics medical treatment equipments with improve.But because of rounding to produce the medical science with the medical science engineering an influence for mutually lacking understanding, together proceeding research not enoughly, therefore returning being in need of efficiently excellent fetal monitoring equipment, and, fetal growth suffering a lot of factors, all of this are the obstacle to researcher how to manufacture the equipment.After sufficient survey and analysis about the fetal monitoring equipment on the market and fully understand about the importance of this equipment in the gynaecology, I begin my paper.The textual work includes primarily two part.The first part according to the request and standard of fetal monitoring , designed the hardware of the system with the software.Among them have an introduction for completely to the fetal monitoring, and give a detail exoatiate on fetal heart rate monitoring. About how to obtain and process the signal of fetal heartbeat, I had gave the detail introduction, at the same time , I gave a detailed electric circuit construction. When I processed audio frequency signal ,I adopt variable value comparison device, consumedly lower disturb , and then and again in consideration of proceed a correspondence, possible to be existent of bottleneck problem, put forward the standpoint that data compress to deliver, make the problem get the good solution.System software from VC++ realize, the foundation calculate way be realized by the program language of C.This text work of the second part proceeded the courageous trial to the foundation calculate way the different from improvement, adopt wavelet transform to process the signal of fetal heartbeat. Because wavelet transform has the trait of multi resolution analysis(MRA),It can despose signal under different frequency, and the frequency of fetal heartbeat is very low.So we can decompose the source signal under certain times and then take the low frequency signal after decomposition to analysis,and get fetal instantaneous heart rate from it. Adopt wavelet transform to analysis and process the signal of heartbeat sound is a kind of trail,and the result that get is basic to ascend to give satisfaction.Wavelet transform is a very good method and tool of signal process. There must be have many aspects to improve when use it in process and analysis the signa of fetal heartbeat sound in this article. If we can combine the troditional signal process method used in the fetal monitoring equipment and wavelet transform together. It will produce a leap to the development and manufacture of fetal monitoring equipment.This is a follow-up topic.