neuromore

FFT

https://www.youtube.com/watch?v=spUNpyF58BY - Fourier Transform

You should find what is a freq of a signal (e.g. you should find that it's 3b/s)

you are given signal portion 4.5 s

you can wrap that 4.5 around a circle where 
- 1 rotation per 6 seconds = 1/6 rotations per second
- or 1 rotation per 2 seconds = 1/2 rotations per 1 second (6 full petals, vector that draws a graph is rotating)
- or 1 rotation per 1/3 seconds = 3 rotations per 1 second

x coord of center of mass

transformation is homomorphic (sum then tr = tr then sum fouriers)
if appl tr 2x times -> orig freq (?)

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fft -> dominant freq
dominant delta