频域滤波产生的时域端点效应及避免方法

对数字信号进行频域滤波所得到的时域信号可能在一端被截断,被截去的部分在另一端出现,造成时域信号失真。本文对这一现象的成因进行了理论分析,指出为避免这一现象,滤波过程应遵循的原则,并介绍了两种具体的避免这一现象的方法。通过编写MATLAB程序进行数值实验证明了所提方法的有效性。

The time domain signal obtained by performing frequency filtering on the digital signal may be truncated at one end,and the truncated part appears at the other end,causing distortion of the time domain signal.This article makes a theoretical analysis of the cause of this phenomenon,demonstrates the principles that the process of filtering should follow in order to avoid this phenomenon,and introduces two specific methods to avoid this phenomenon.The numerical experiments by MATLAB program proves the effectiveness of the proposed methods.