MacroMachines
Well-known member
This is a pretty nice interactive java applet that gives a little bit of insight on how the DFT/FFT process works. I have some other learning material that I found quite useful and will gather that here.
http://mathlets.org/mathlets/discrete-fourier-transform/comment-page-1/#comment-12099
http://mathlets.org/mathlets/discrete-fourier-transform/comment-page-1/#comment-12099