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。
It is shown that the improved algorithm provides more accurate calculation results than the complex Gaussian function expansion, so long as the number of Fourier series is no less than 30.
研究表明，只要傅里叶级数项数不少于30，改进后的算法比直接用复高斯函数展开具有更高的计算精度。
The Fourier algorithm and its improved algorithm are emphasized.
重点分析了傅氏算法及其改进算法。
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