From Fourier series to continuous Fourier transform (CFT) Sampling
Discrete-time Fourier transform (DTFT)
Discrete Fourier transform (DFT) and FFT
Window function and spectral estimation
Linear time invariant (LTI) system and Z-transform
Random signals
Sparse representation
Principle component analysis (PCA)
Convolutional neural networks (CNNs)
Generative neural-network models