对心电信号进行滤波处理后，计算RR间隔，进而求得瞬时心率和心率变异系数，通过对RR间隔的变化曲线进行频谱分析，从而求得各个自律神经活动的评价指标-After filter processing is performed on the ECG, the RR interval is calculated, and then seek the instantaneous heart rate and heart rate variability coefficient, spectral analy