Research on Feature Fusion Method of Mine Microseismic Signal Based on Unsupervised Learning

Figure 6

Frequency band energy ratio of each decomposition layer of microseismic signal: (a) 3-layer wavelet packet analysis; (b) 4-layer wavelet packet analysis; (c) 5-layer wavelet packet analysis; (d) 6-layer wavelet packet analysis.

(a)

(b)

(c)

(d)