can someone explain to me what this code means??

2014 6 23
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更新时间：2014 7 14
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Its actually a guitar tuner made by Ryann Kinnett. I tried to interact with him but unfortunately his e-mail is out. Anyway, I think I know what the program does at certain lines but mostly what I am struggling to figure out is the FFT section...
here is the links to the program http://www.mathworks.com/matlabcentral/fileexchange/26367-guitar-tuner/content/GuitarTuner.m
go to "download submisson" at the upper right if you want to run it on matlab
Cheers!!

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Jan
Jan 2014-6-23
What exactly is your question? I suggest to post the corresponding line, explain, what you have understood so far and ask a specific question.
John Bitzios
John Bitzios 2014-6-23
I dont get the fft section... to be specific i am referring to the following lines:
NFFT=2^nextpow2(L);
fftdata=abs(fft(data,NFFT)/L;
the default code matlab gives is
NFFT = 2^nextpow2(L);
Y = fft(y,NFFT)/L;
So, the only thing that changes is the absolute value...why would he do so??

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dpb
dpb 2014-6-23

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2/L*abs(Y(1:NFFT/2+1)))
gives a one-sided (DC to Nyquist) amplitude spectrum. The above is the two-sided version from [-Nyquist:Nyquist] with DC in the middle.

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