Design And Implementation Of Heart Sound Pre-diagnosis System Based On Android Platform

The heart sound signal is a judgment of heart disease and effect of technical indicators; it provides an important basis for diagnosis and prevention of heart disease. According to the imperfection of current physician-patient pattern and health information service; this paper describe pre-diagnosis system of heart sound signal based on Android platform. The platform is made up of heart sound signal acquisition and processing module, heart sound playback, display and storage module, diagnostic analysis of heart sounds based on wavelet transform, and provides information management services and remote transmission function.This paper firstly introduces the background, significance and status of domestic and international research of heart sound identification. Then it introduces the Android operating system which includes the origin, architecture, applications components and software development environment of Android. Then it introduces the basic theory of heart sound which includes the composition and the mechanism, time domain and frequency domain characteristics, authentication framework. Then it introduces segmentation, feature extraction and pattern matching of heart sound heart. Finally it introduces details of all system modules, interface and code of recognition algorithm.Electronic stethoscope is connected to a mobile phone to capture heart sounds, Then passed to pre-amplifier and band-pass filtering, after wavelet threshold filtering heart sound cycle is calculated using the average Shannon energy and signal correlation. After that heart rate calculation, heart sound segmentation, feature extraction and diagnostic identification is completed, finally heart sound is classified as normal heart sounds, systolic murmur or diastolic murmur.The system interface is simple and easy to operate and has a fast recognition speed. What’s more, it meets the design requirements. It achieves the desired effect.