Equation 1 is used to generate a synthetic signal y
with sampling frequency of 8 kHz: (a) Signal y
, ( α,σ,μ,a ) for each component from 1 to 7 is as following: (2,0.1,0.61,2Π3600), (2,0.05,0.68,2Π600), (2,0.05,0.86,2Π600), (2,0.03,1.37,2Π600), (3,0.001,0.23,2Π1700), (3,0.001,1.22,2Π1700), (2,0.04,1.12,2Π1000). (b) Signal y2is created by adding a chirp to signal y1. The chirps starts at frequency of 2 ∗ Π 20 and reaches to 1 kHz at 0.125 s. (c) TFD of y1. (d) TFD of y2. (e) TF feature plane including the feature points. The middle cluster was selected as the discriminant features, and the remaining feature points were identified as the commonality features between the two signals. (f, g) the TFD structures selected as the common and discriminant patterns in y1and y2, respectively.