[chuck-users] Using Fourier Transform

Rebecca Fiebrink fiebrink at princeton.edu
Sun Jan 16 21:18:17 EST 2011

Hi Lucas,

Sorry for the late reply. But since one doesn't really learn the true nature of the FFT in 5 days, I think this may still be helpful.

My favorite resources for learning & teaching about FFT are:
- Julius Smith's online tutorial: https://ccrma.stanford.edu/~jos/mdft/
- Ken Steigglitz's book: http://www.amazon.com/Digital-Signal-Processing-Primer-Applications/dp/0805316841/ref=sr_1_1?ie=UTF8&s=books&qid=1295230522&sr=8-1  This book will teach you not just about FFT, but about musical signal processing in general -- it's well worth the money.

Both are written with music in mind. 

For a much higher-level overview, you can see my FFT "cheat sheet" here: http://www.cs.princeton.edu/~fiebrink/314/2010/week8/FFT_handout_2010.pdf
along with code examples from that day of class here http://www.cs.princeton.edu/~fiebrink/314/2010/week8/
and scribe notes (written by a student) here http://www.cs.princeton.edu/~fiebrink/314/2010/week8/scribe_Mia.pdf


On 2011-01-11, at 9:00 AM, chuck-users-request at lists.cs.Princeton.EDU wrote:
> Date: Tue, 11 Jan 2011 09:27:42 -0200
> From: Lucas Zawacki <lfzawacki at gmail.com>
> To: ChucK Users Mailing List <chuck-users at lists.cs.princeton.edu>
> Subject: [chuck-users] Using Fourier Transform
> Message-ID:
> 	<AANLkTi=vBnKCqQoKaii3Bq1jscdnqqLd1j21PUkBsPPi at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> Sup guys. This is not much of a ChucK question but here goes...
> I have some free time now to experiment with ChucK and I dug up some
> old emails from the list. There's one talking about analysing the
> frequency of a given signal and the short answer was to use the FFT.
> I decided I would try this aproach in order to receive input from my
> guitar, match the frequency being played and then issue a MIDI event
> to another synthesizing app. The problem is that I have a very
> abstract understanding of the FFT (I've used it before to do simple
> image processing). It does makes sense to me, e.g I can visualize in
> my mind what the FFT of a simple sound wave would look like, but I
> wasn't competent enough to extract the absolute pitch data that I
> wanted.
> Anyway can someone elaborate a little more on the topic of frequency
> analisys or maybe point me to a good tutorial?
> I think I'll start with the wikipedia article on the Fourier Transform
> and see where it gets me...
> -- 
> http://www.twitter.com/lfzawacki
> http://www.linesocode.wordpress.com
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