Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-04-17 Cooperative journals: 《计算机应用研究》
Abstract: Due to the envelope fitting problem exists in the process of empirical mode decomposition, this paper proposed an improved algorithm which could eliminate the undershoot phenomenon exactly. By introducing "pseudo-extreme points", this algorithm increased the number of extreme points and formed new extreme value sequence. Then it got new envelope by using the new extreme value sequence interpolation. The envelope fitted by this method was closer to the original signal and has better smoothness. Finally, A contrast result between cubic spline interpolation and this algorithm showed that the number of undershoots decreased by about 77.5%, which proved that this algorithm could effectively reduce the number of undershoot points. In addition, fitting the envelope could tightly wrap the original signal and have a better envelope.