Research Of Heart Sound Signal Acquisition Device Based On STM32

The Chinese cardiovascular disease report 2014 shows that the number of people suffering from congenital heart disease has reached 4 million until August 2015. What the worse is that comparing to the past data of congenital heart disease, incidence rate is increasing year by year, the trend has become more and more obvious. For patients with congenital heart disease, the earlier found and sooner the treatment, the quality of life will be much better in the future. Newly diagnosed cases are the beginning of the whole treatment process. For the diagnosis of cardiovascular disease, one of the important basis is the patient’s heart sound signal. So the development of portable easy operation of heart sound acquisition equipment, to facilitate the follow-up of heart sound signal for analysis and judgement, can provide important clinical data for the medical workers, but also alleviate the remote areas lack of judgment of medical workers in congenital heart disease situation, have important practical significance.The design is mainly to improve and design the heart sound acquisition device based on STM32 embedded platform, which provides an important guarantee for the follow-up study of heart sound signals. The acquisition system is mainly composed of the front-end acquisition circuit, the STM32 embedded hardware platform and the host computer. Hardware acquisition circuit of heart sound signal after amplification, heart sound auscultation in real time, another way of heart sound signal through the udal380 audio module incoming chip STM32. Then the PL2303 serial port module sent to the personal laptop. Display and save on the MATLAB platform in a personal computer. The whole equipment system transforms the original heart sound analog signal into digital signal and displays the preservation, which is the basis for the subsequent analysis and study.