关键词: 智能手机, 心音, 监测系统

Abstract: Heart sound monitoring plays an important role in the detection and prevention of heart diseases. A heart sound monitoring system based on smartphone is researched and designed, which consists of measurement node, smart phone node and server side. The measurement node is employed to acquire the heart sound. The smartphone node receives the heart sound from the measurement node, and then the acquired data are transmitted to the server by GPRS network. Remote monitoring of the heart sound is realized on the sever side. The smartphone node is the center of the system and its main function is to analyze and process the heart sound. Firstly, heart sound is preprocessed with the threshold denoising method based on the wavelet transform. Secondly, features are extracted by LZ（Lempel-Ziv） complexity algorithm. Lastly, the features are used to evaluate cardiac function and alert its abnormality. Through functional test, the system can operate stably.

Key words: smart phone, heart sound, monitoring system