AE	Acoustic emission
EWT	Empirical Wavelet Transform
CNN	Convolutional Neural Network
AEWT	Adaptive Empirical Wavelet Transform
IMF	Intrinsic Mode Function
TD	Time Domain
FD	Frequency Domain
TFD	Time-Frequency Domain
STFT	Short-time Fourier transform
FFT	Fast Fourier transform
DL	Deep learning
ReLU	Rectified neural network