前言：目的：实现心音信号提取。
Objective: To detect and analyze the heart vibration signal.
结果：心音与心电的同步采集信号的对照显示该方法能够有效提取心音信号。
Result: it is an effective method to detect the heart vibration signal compared with simultaneous ECG recording.
方法：使用HKY06 A心音传感器提取心音信号，使用双向检波及低通滤波实现心音包络的提取。
Method: to use Model HKY06A heart vibration sensor for the detection of the heart sound, and to form the heart sound envelope with two way hardware rectification and low frequency passed filter.
方法：使用HKY06 A心音传感器提取心音信号，使用双向检波及低通滤波实现心音包络的提取。
Method: to use Model HKY06A heart vibration sensor for the detection of the heart sound, and to form the heart sound envelope with two way hardware rectification and low frequency passed filter.
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