A fourier transform takes any function or set of data usually a y(t) type thing (but it could really be anything, and could be multi dimensional… but let’s not get into that) and turns it into a A(f), where A is amplitude and f is frequency. Essentially it takes the function, turns it into a bunch of sinusoids (of different amplitudes and frequencies) that have could have been summed together to get the y(t) and outputs it as A(f) so that you can graph it as amplitude vs frequency to see what frequencies are most common in your data. I’m a little rusty on the other terms.
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