Design Of Heart Sound Acquisition System Based On Raspberry Pi And Heart Sound Signal Analysis

With the development of medical technology,there has been a great breakthrough in the treatment of congenital heart disease.When the treatment measure is not a difficult to people,how to reduce the proportion of congenital heart disease patients has become a new problem.Recently,more and more hospitals and charitable organizations are conducting screening work for congenital heart disease across the country.Screening methods are mainly performed by experienced doctors firstly,and then use advanced ultrasound equipment to confirm the diagnosis.During this process,there are many false diagnosis and missed diagnosis because of the large number of auscultation patients,the lack of doctors and the excessive work fatigue of doctors and other objective reasons,so that some children with congenital heart disease lost the opportunity to get treatment by doctors.Heart sounds contain a large amount of information about the human heart.Therefore,designing a portable heart sound acquisition system to collect children’s heart sounds and then finding out the pathological features contained in heart sounds can help doctors initially identify whether children suffering from congenital heart disease or not.It can not only reduce the burden on auscultation doctors,but also reduce the misdiagnosis rate caused by objective reasons,and then increase the chances for each congenital heart disease child to receive assistance.This has very important social significance.This paper introduced the development of heart sound acquisition and heart sound research.Then a portable heart sound signal acquisition system is designed according to the difficulty of collecting heart sound signals in the actual field and the requirement of setting up a heart sound database.The system uses the current popular Raspberry Pi as a development platform,including Qt programming software and front-end circuit.The front-end circuit collects the heart sound signals and then transmitting to the host computer based on Raspberry Pi through the network,and the whole man-machineinterface of the system is designed with Qt.The acquisition process was finally implemented on the Raspberry Pi.The system test results combine the heart sound acquisition,storage,visualization is realized.The collection of heart sound signals through the system provides a reliable source of data for heart sound researchThis paper analyzes the preconditioning of heart sound signals,The signal is denoised by wavelet denoised.The envelope of the signal has been extracted by using Hilbert transform method and signal is segmented by using double threshold method.Preconditioning has certain reference value for the recognition of heart sound signals...