一种消除局域波法中边界效应的新方法

New method for processing end effect in local wave method

局域波法能在时频图上正确地描述非平稳非线性信号的局部特征 .但由于信号边界的不确定性 ,现有的边界处理方法都不能有效地消除边界效应 ,造成时频图内两边端点附近信号的能量扩散 .因此精确估计边界值是局域波法的关键问题 .采用边界波形匹配的方法预测边界值 ,无论边界点是极值点或非极值点 。

The local wave method can describe the partial feature of the dynamic signal in time-frequency domain. But the end effect that can cause spectrum energy diffusing at the ends in time-frequency domain is still a key problem in the local wave method and can not be solved by existing methods. With the wave form matching method discussed to estimate the mean value of the ends, no matter whether the end value is extremum or not, the end effect can be eliminated effectively.