关于母小波的选择问题

xiaoxiong702

虽然常用的小波知道几个，但是针对自己要分析的信号如何选择不太清楚。新手刚接触小波，请大家给点经验，应该是有些规律的吧。另外关于分解后信号重构，系数应该如何选择呢？

[ 本帖最后由 xiaoxiong702 于 2009-9-25 10:51 编辑 ]

skywolfzxm

原则就是选择的小波基和分析信号尽量一致，有一些指标可以用来度量接近的程度，比如小波熵。看看这个：
PARAMETERS OPTIMIZATION  OF CONTINUOUS WAVELET TRANSFORM AND ITS APPLICATION IN ACOUSTIC EMISSION SIGNAL ANALYSIS OF ROLLING BEARING

Abstract: Morlet wavelet is suitable to extract the impulse components of mechanical fault signals. And thus its continuous wavelet transform (CWT) has been successfully used in the field of fault diagnosis. The principle of scale selection in CWT is discussed. Based on genetic algorithm, an optimization strategy for the waveform parameters of the mother wavelet is proposed with wavelet entropy as the optimization target.