Acoustic Emission Signal Recognition of Different Rocks Using Wavelet Transform and Artificial Neural Network

Table 2

The distribution of the frequency band in each layer.

	The layer of wavelet decomposition
	CA6	CD6	CD5	CD4	CD3	CD2	CD1
Frequency range (kHz)	0~78	78~156	156~312.5	312.5~625	625~1250	1250~2500	2500~5000