中文说明：
用于求一个信号的斜率，通过构造一个滤波器来实现的，绝对正确。
English Description：
It is used to calculate the slope of a signal by constructing a filter, which is absolutely correct
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中文说明：
用于求一个信号的斜率，通过构造一个滤波器来实现的，绝对正确。
English Description：
It is used to calculate the slope of a signal by constructing a filter, which is absolutely correct