Description of the short time Fourier transform, also known as the spectrogram.
Slides: https://cds.nyu.edu/wp-content/uploads/2021/05/stft_handout.pdf
Notes: https://cds.nyu.edu/wp-content/uploads/2021/05/beyond_fourier-1.pdf (Section 1.2)
Code: https://github.com/cfgranda/math-tools-nyu/blob/main/07%20STFT.ipynb
Course website: https://cds.nyu.edu/math-tools/