Although the average was zero, each interval had a maximum (and a minimum) reading. In this graph, my APM is displaying a flat zero line indicating the average but also the maximum value.
虽然平均值是零，但是每一个时间间隔都有一个最大(和最小)读数。
Say you have a minimum, well, the tangent plane at this point, at the bottom of the graph is going to be horizontal.
如果你说这是个极小值，那么这点的切平面应该是水平的。
Though examples of common signal and sine signal, by the frequency spectrum graph and theoretical analysis, the minimum sample rate of the sampling theorem is made clear.
以一般信号和正弦信号为例，通过理论分析和频谱图示意，对抽样定理中最低抽样率的取值进行了明确的说明。
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