January 2011 - chuck-users - lists.cs.princeton.edu

input gain analysis, LiSa example
by Michael Heuer 22 Jan '11

22 Jan '11

Hello ChucKers, I'm thinking of giving the RPM challenge (http://rpmchallenge) a try this February and am missing two things from my ChucK kit 1) A ChucK snippet to analyze the gain of an input signal. I could just watch for peak values every sample but that doesn't seem like the right thing to do. 2) An example/tutorial of how to use LiSa to approximate a looper pedal (record, overdub, undo, redo). See e.g. http://www.essej.net/sooperlooper/ http://web.mit.edu/~eric_r/Public/mmmtsss/ Thanks in advance, michael

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Re: [chuck-users] Using Fourier Transform
by Rebecca Fiebrink 16 Jan '11

16 Jan '11

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/0805… 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 Best, Rebecca On 2011-01-11, at 9:00 AM, chuck-users-request(a)lists.cs.Princeton.EDU wrote: > > Date: Tue, 11 Jan 2011 09:27:42 -0200 > From: Lucas Zawacki <lfzawacki(a)gmail.com> > To: ChucK Users Mailing List <chuck-users(a)lists.cs.princeton.edu> > Subject: [chuck-users] Using Fourier Transform > Message-ID: > <AANLkTi=vBnKCqQoKaii3Bq1jscdnqqLd1j21PUkBsPPi(a)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 > > > ------------------------------ > > _______________________________________________ > chuck-users mailing list > chuck-users(a)lists.cs.princeton.edu > https://lists.cs.princeton.edu/mailman/listinfo/chuck-users > > > End of chuck-users Digest, Vol 66, Issue 9 > ******************************************

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Music Hack Day coming to New York
by Jordan Orelli 13 Jan '11

13 Jan '11

there's an audio-related hackathon coming up in NYC. 16 spots left. I'll definitely be in attendance. It'd be cool if there was some ChucK presence there :-D http://nyc.musichackday.org/

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Using Fourier Transform
by Lucas Zawacki 11 Jan '11

11 Jan '11

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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TweecKs
by Spencer Salazar 07 Jan '11

07 Jan '11

Hello everyone! Inspired by a forum thread[1], a Stanford CCRMA homework assignment[2], and something similar I heard about in the SuperCollider world, I have created a community-driven Twitter account for the express purpose of broadcasting meaningful, self-contained ChucK programs that fit into a single tweet. The programs tweeted from this account will be based on submissions from folks like yourselves. I will be acting in a limited curatorial role due to the nature of this sort of thing, but the goal is really to get as many interesting programs from as many people as possible. Without further ado: http://twitter.com/TweecKs To submit your program, simply tweet it to @TweecKs. You can also send me an email: spencer at ccrma.stanford.edu. If you send me an email, please make sure your program is 140 characters or less, including a block comment with a credit (if desired). There aren't any guidelines as far as quality; as long as it runs, makes sound, and doesn't do anything apparently malicious to people's computers, its good! And, if you are a Twitter user, do consider following @TweecKs, to stay up-to-date on the latest in concise audio programming! [1] http://electro-music.com/forum/viewtopic.php?t=13512 [2] https://ccrma.stanford.edu/wiki/220b-winter-2011/hw0#Specification_.28part_…

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chuck in a safe box?
by Zed A. Shaw 06 Jan '11

06 Jan '11

Hi, I'm toying with a small idea to let people upload bits of chuck code to a website and then have it play out to the world. I haven't started coding anything yet, but I was wondering how hard it is to put ChucK into a safe environment so that it can't touch the OS? In Lua I'd do that by ripping out the various OS features. Is there a similar thing with Chuck? -- Zed A. Shaw http://zedshaw.com/

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chuck posibilities at sample level
by ronni montoya 04 Jan '11

04 Jan '11

Hi, im new in this list, i was using supercollider before, somebody told me about something about the posibilities of chuck for making sample level operations. Can anybody explain me about this? Do you think chuck has new posibilities related to sample level synthesis? that cannot been done with sc3? can anybody explain this further? thanks in advance R.

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chuck for live coding
by ronni montoya 04 Jan '11

04 Jan '11

Hi everybody ,im new with chuck ive downloaded chuck and i was playing with it. I was wondering is it possible to run a command directly in the shell instead of saving the code in a .ck file and execute it ? are there any tutorial or examples of chuck for live coding out there? thanks R.

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Selecting Driver
by Tom Aizenberg 01 Jan '11

01 Jan '11

Hi all, Is it possible to select which driver for the soundcard I want to use? Like in Reason or Logic you can select the ASIO driver and change the buffersize... Any help would be appreciated! Greetings, Tom

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