Signal theory and Fourier Transform, DFT :an incredible visual introduction

Look at this place that contains a fantastic introduction to signal processing and DFT using visual material:

https://jackschaedler.github.io/circles-sines-signals/index.html

https://jackschaedler.github.io/circles-sines-signals/dft_introduction.html     …this is a genius work

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Amazing good explanation of Fourier Transform

This explanation of the fourier Transform was obtained from:
http://blog.revolutionanalytics.com/2014/01/the-fourier-transform-explained-in-one-sentence.html

http://www.r-bloggers.com/the-fourier-transform-explained-in-one-sentence/

http://www.altdevblogaday.com/2011/05/17/understanding-the-fourier-transform/

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