滤波器频带精确重构/再现中的信号外延问题

The Study on the Signal Extension about Frequency Band of Electric Filter in the Accurate Reconstructure /Reappearance

在定义小波变换时,信号长度认为是无限长的.但实际的信号是有限长的,所以,在对其进行变换前需将其外延.问题在于如何将其外延可以使信号末端的影响最小,或者说,如何找到保持变换信号长度的外延方法.本文对滤波器频带精确重构/再现中的信号外延问题进行了讨论.

In the process of defining wavelet transform, signal length is assumed to be infinite, but the actual signal＇s length is limited, it is necessary to extend signal length before transform. The main problem is how to extend signal length and minimize the influence on signal end, that is, how to find out certain method to keep transformation signal length. In this paper, the problem of the signal extension about frequency band of electric filter in accurate rescontructure/reappearance was studied.