ECG信号处理获得各种features，包括P和T波的参数，该程序使用的数据来自mit database 如果要执行该程序，要修改ECG 信号的源文件目录-ECG signal processing to obtain a variety of features, including the P and T-wave parameters, the program uses data from mit database

心电图的傅里叶变换，反傅里叶变换滤波等等。阈值算法求波位置。-ECG Fourier Transform, the anti-Fourier transform filtering and so on. Threshold algorithm for wave position.