In this paper, a comprehensive method combined by DC component method, AC superposition method and loss current measurement method are described at first.
首先介绍了由“直流分量法”、“交流叠加法”和“损耗电流测量法”三者结合起来的综合判断方法，然后重点论述了交流叠加法的具体实现方案。
This paper studies several sorts of improved Fourier algorithm in recent years, particularly analyzes the method of filtering decaying DC component.
对近年来提出的几种改进傅氏算法进行分类研究，着重分析了其滤除衰减直流分量的方法。
The method USES the DC component and the first harmonic of a curve's chain code expressed by Fourier series to fit the curve, avoiding the inverse calculation of an array used in general methods.
该方法利用闭合曲线的傅立叶级数表示的直流分量和一次分量实现对闭合曲线的椭圆拟合，可以避免通常椭圆拟合方法中的矩阵求逆问题。
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