一种基于智能移动终端的低成本心音采集系统

Purpose：To prevent cardiovascular diseases, and reduce the cost of the electronic stethoscope, this article designs and implements a heart sound acquisition system based on low-cost smart phone Android system. Methods: In this paper, a combination of hardware and software achieves the acquisition of the heart sounds. Via an AV cable, the hardware of this system transmits analog heart sounds signal to smart phone. The heart sounds can be real-time displayedon the smart phone and can be saved as wav format for further analysis and transmission by our designed software based on Android system. By using subjective evaluation and objective evaluation method, the performance of our designed stethoscope was compared with these of two commercial stethoscopes, which have widely clinical applications currently on the market. Results: The designed system can readily capture heart sounds with high quality. The SNR of the phonocardiogram is very high. Compared with two kinds of clinical stethoscopes, the performance of our designed system is satisfactory. Conclusions: The system is portable. The acquisition of heart sound signal is convenient and accurate. Through intelligent terminals, this system can send heart sound data to doctors to facilitate the diagnosis.