压缩和伸展在最初时也是做完的去防止由于大量的运动模糊所产生的滤波作用。
Squash and Stretch was also initially done to prevent strobing due to lack of motion blur.
软土对高频地微动信号有滤波作用，对低频信号起放大作用，而硬土层则相反。
Soft soil can filter high frequency signals, but can amplify low frequency signals.
本文中就是力求利用滤波作用滤除对我们实际真值信号产生干扰的噪声，使之尽量达到我们所需要的期望信号。
In this text, we can get rid of the noises disturbing our real signal through the function of filtering, making it attained the expectation signal we needed.
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