Accelerometer readings can be jerky and noisy. Applying low-pass filtering on the signal allows you to smooth it and get rid of high frequency noise.
加速度传感器数值可能被颠簸和噪音影响。应用低通过滤器在信号上可以是它平滑，并摆脱高频噪音的干扰。
Filtering the high frequency part of the signal and reducing the sampling frequency, which does not produce the aliasing, is called sampling.
从信号中去除高频信息，降低抽样频率而不导致频谱混叠的过程称之为抽取。
By using the high frequency emphasis filtering instead of the high pass filtering, the image enhancement effectiveness is obviously improved.
该方法通过用高频加强滤波代替原算法的高通滤波，使增强效果得到了显著提高。
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