Quote:
Originally Posted by EricVanWyk
What I'm trying to say is that people often say FFT when they mean FT. Its sort of like calling all rectangles squares because you happen to be more used to squares.
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Well, a Fourier transform is a Fourier Transform, the only difference is the method used. As Alan noted, the FFT is a method well suited to use by computers. In today's world, the overwhelming majority of the Fourier Transforms actually done use the FFT.
Oh, and it's a ton faster than the "original" way developed by Fourier.
What does it do? It converts between the Frequency domain and the Time domain.
Time domain is what you see on an oscilloscope: The X axis is time.
Frequency domain is what you see on a spectrum analyzer. X axis is frequency.
In both cases, the Y axis is amplitude.