can someone explain to me what this code means??

1 view (last 30 days)
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...
go to "download submisson" at the upper right if you want to run it on matlab
Cheers!!
  2 Comments
Jan
Jan on 23 Jun 2014
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 on 23 Jun 2014
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??

Sign in to comment.

Accepted Answer

dpb
dpb on 23 Jun 2014
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.

More Answers (1)

John Bitzios
John Bitzios on 14 Jul 2014
What about the while gcbo command???

Categories

Find more on Audio Processing Algorithm Design in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!