用窗函数法hamming设计的FIR数字低通滤波器，能够实现心电信号中随机噪声的去除,Hamming window function method with the design of FIR digital low-pass filter, ECG can be achieved in the removal of random noise

用双线性Z变换法设计IIR巴特沃思型数字低通滤波器，能够实现心电信号中随机噪声的去除。-Bilinear Z transform with the design of IIR Butterworth digital low-pass filter, ECG can be achieved in the removal of random noise.