消除心电图的基线漂移是个重要问题。本文采用分片三次埃尔米特插值来作基线漂移校正,提出了当心率变化引起插值区间信号长度变化时,插值基函数的线性变换规则。由此可以保持拟合的高精度,又减少计算量,有可能用于实时心电监护。如果监护仪中的CPU能力有限,本文还提出了一种计算埃尔米特插值函数的硬件电路,使每一点的计算时间缩短为12μS。 Eliminating ECG baseline drift is an important issue. In this paper, we use sliced ​​cubic Hermite interpolation as baseline drift correction, and put forward a linear transformation rule of interpolation basis function when signal length of interpolation interval changes due to change of heart rate. This can maintain the high accuracy of the fit, while reducing the amount of computation, it is possible for real-time ECG monitoring. If the CPU capacity of the monitor is limited, this paper also proposed a hardware circuit to calculate the Hermite interpolation function, so that each point of the calculation time is reduced to 12μS.