pam我们考虑常见的插值(抽取)运算和滤波器级联的情形，在实际的插值(余

:)运算中，为了避免信号在经过插值(抽取)后出现混盛现象，保证能无失多

恢复信号，我们常常在插值运算之后(抽取运算之前)加上插值(抽取)滤公

时信号进行带限，如图2.10左边所示。

-we consider common interpolation (extraction) and Operational FILTER circumstances, In the actual interpolation (I :) operator, in order to avoid signal after interpolation (taken) after mixed Sheng, guarantee that it will lose no more than restore signals We often after the interpolation operation (from operations before), plus interpolation (extraction) filter when public signal band-limited, 2.10 figure shown in the left side.