中文说明：经验模态分解以后，可以画三维的图，一瞬时频率，时间和幅值为坐标
English Description：
After empirical mode decomposition, a three-dimensional graph can be drawn with instantaneous frequency, time and amplitude as coordinates
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中文说明：经验模态分解以后，可以画三维的图，一瞬时频率，时间和幅值为坐标
English Description：
After empirical mode decomposition, a three-dimensional graph can be drawn with instantaneous frequency, time and amplitude as coordinates