===== fourier analysis =====
  * [[https://realpython.com/python-scipy-fft/|overview/tutorial with numpy & scipy]]
  * [[https://ipython-books.github.io/101-analyzing-the-frequency-components-of-a-signal-with-a-fast-fourier-transform/|anaylyzing frequency components with scipy and fftpack]]

===== wavelet analysis =====
  * [[https://github.com/regeirk/pycwt|continuous processing wavelet analysis]]


===== reading files =====
  * [[https://www.geeksforgeeks.org/how-to-read-csv-files-with-numpy/|read csv files with numpy]]

===== plotting =====
  * [[https://stackabuse.com/how-to-set-axis-range-xlim-ylim-in-matplotlib/|setting ranges on axes]]
  * [[https://matplotlib.org/stable/api/_as_gen/matplotlib.colors.Colormap.html#matplotlib.colors.Colormap|colormapping plots]]

===== spectrogram =====
  * [[https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.specgram.html|plotting a spectrogram with matplotlib]] (reference)
  * [[https://pythontic.com/visualization/signals/spectrogram|plotting a spectrogram with matplotlib]] (example)

===== filters =====
  * [[https://stackoverflow.com/questions/12093594/how-to-implement-band-pass-butterworth-filter-with-scipy-signal-butter|implementing a software butterworth filter]]