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在数字信号处理技术中,当采用 FIR 滤波时,如果被过滤的信号是一个长序列,有时采用重叠相加法或重叠保留法。本文分析了重叠保留法的基本思想,分析了应用这种方法时,在有些点上循环褶积等于线性褶积,而在另些点上循环褶积不等于线性褶积的实质。分析了容易出现的错误概念以及可以采用的一种修正方法。最后给出了在微机上进行上述运算的结果。
In digital signal processing, when FIR filtering is used, if the filtered signal is a long sequence, sometimes overlapped or overlapped holds are used. In this paper, we analyze the basic idea of the overlap-preserving method, and analyze that when using this method, the cyclic convolution is equal to the linear convolution at some points and the cyclic convolution is not equal to the essence of the linear convolution at other points. An analysis of the erroneous concepts that are prone to occur and one of the correction methods that can be used. Finally, the result of the above operation on the microcomputer is given.