一种快速滤除衰减直流分量的新型递推傅氏算法

本文在递推傅氏算法基础上，提出了一种能够完全滤除衰减直流分量的新算法。新算法对递推初始的数据窗位置没有特定要求，可以任意采样点为初始位置，取N 2个采样点求出衰减直流分量的时间常数和初始值，即可通过直接计算方法得到任意采样点处衰减直流分量引入的误差，或通过递推方法迅速得到其它各采样点处的衰减直流分量误差。新算法具有计算简单，响应速度快、计算精度高、抗干扰性能好的优点。

A NOVEL RECURSIVE FOURIER ALGORITHM FOR FILTERING DECAYING DC COMPONENT

This paper presents a n ov el algorithm based on recursive Fourier transform to completely filter decaying DC component. The new algorithm has no particular request for the initial samp ling point of data window, and it can use any sampling point as the start point of recursion. The algorithm can make out the time constant and initial value of DC component using only one cycle sampling data plus two points, then can direct ly make out the influence of decaying DC component of any sampling point, and ge t the influence of decaying DC component of other points using the recursive met hod. The new algorithm has virtues of simple calculation, fast response, high ac curacy, and high resistibility for disturbance.