与离散小波变换相比,连续小波变换在时间、尺度网格上的划分更为细致,小波基无须满足正交性,且具有时移不变性,从而在信号特征提取上比离散小波变换更有优势。
Compared with discrete wavelet transform (DWT), CWT has such advantages: the wavelet needn’t to be orthogonal and is of time invariant; the sampling grids in the time-scale plane are less sparse. These advantages make CWT more suitable for feature extraction in mechanical fault signals .