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From: Luis Roldan on 26 Apr 2010 11:04
Hi.

In the example on how to use fft, once they have the signal, they do this:

NFFT = 2^nextpow2(L); % Next power of 2 from length of y
Y = fft(y,NFFT)/L;

Meaning that they get the next power of 2 from length of y (the signal), and then they calculate the NFFT-points fft, to then divide it by L (length of y).
¿Can you tell me why they do that?

What I'm trying to do is capture a sound signal and then with the fft get the frequency of that signal.

Thank you!
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