说明：  利用神经网络分析方法对一个给定信号的两端进行延拓，在数据的两端各得到两个附加的极大值点和两个附加的极小值点.由此利用三次样条函数得到原始信号的上下包络线和平均包络线，实现了准确的EMD分解.
(The use of neural network analysis of a signal at the two ends of a given extension to the data obtained at the two ends of the two additional maxima and minima of two additional points. This use of cubic spline function has been the top and bottom of the original signal envelope and the average envelope to achieve an accurate decomposition of the EMD.)