【摘要】 用数值拟合法代替数字滤波法，实现了对不同频率误差信息的分离。通过推导证明两种方法在本质上是相同的。当将前者按后者的形成理论进行推导时，得出了一种与传统窗函数形状迥然不同的新型窗函数。给出了全部推导过程，并介绍了实用效果更多还原

【Abstract】 It is achieved satisfactorily to realize the separation of error signals with various freqences by numerical fitting instead of digital filtering.It is proved that both numerical fitting and digital filtering are the same in essence.During the process of reasoning the former、according to the theory of the latter,a new window function is obtained of which the shape is completely different from that of traditional window functions and has never been seen before.The entire process of reasoning and the effect of its practice are given.更多还原