Fourier Transform

Fourier Transform

is a technique to decompose signals into sine and cosine waves

1. Deconstructing time series using FT

2. Medium series, mostly on the math, parts 1 2 3 4 5

Wavelets

1. Medium on What is a wavelet and how do we use it for DS

2. Medium on the wavelet transform

3. Medium multiple time series classification using continuous wavelet transformation and scalograms

4. pywavelets - PyWavelets is open source wavelet transform software for Python. It combines a simple high level interface with low level C and Cython performance.