FFT Properties - Version 3.5 More and more people this days find themselves in a position where knowledge of FFT is crucial for there work, but they did not study electrical engineering and they do not want to spend several months behind an 800 pages book, just to learn the few things about FFT required for their application. And even then, the uncertainty that they have missed something important, will just not want to go away. FFT Properties was written with the intention, to demonstrate what is the property of the signal itself and what is the property of FFT transformation. This is the fundamental knowledge required for the interpretation (measurement) of the frequency spectrum.