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

presenting a ChucK thesis + anthem
by Ge Wang 30 May '08

30 May '08

Dear all, We present to you a ChucK PhD thesis: http://www.cs.princeton.edu/~gewang/thesis.html ... and, of significantly higher replay value, Perry's ChucKian anthem: http://www.cs.princeton.edu/~prc/HackChuck.html Hearty and deep thanks to everyone in the ChucK community for your support, ideas, code, guidance, and encouragement so far!!! Also, we'd like note that this marks not an end but a new beginning for ChucK, and that research, development, crashing of ChucK and friends will continue in full - at Princeton, Stanford, and many other places. New features, new bugs, new applications, toolkits, approaches, ideas, improvements to the community development process, and new things we can't begin to predict are on the way! Thank you!! Happy ChucKing and keep on ChucKin'! Yours, Ge! (on behalf of ChucK team)

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Fedora users here?
by Kassen 30 May '08

30 May '08

Dear fellow ChucKists, Is anybody who runs ChucK on Fedora and knows his way around that OS? Some people are having issues building on it and getting the dependencies straight on the forum; http://electro-music.com/forum/viewtopic.php?t=26414 Most of the Linux users there are on Debian-based systems. Particularly the version of G++ needed seems to give issues. If somebody could perhaps help? If it does turn out that the version of G++ needed is critical and non-standard on some popular Linux versions it might be a good idea to make a note of this on the Linux download section and/or the building instructions? That might save future confusion. Confusion is of course great but repeating the same confusion multiple times gets stale. Cheers, Kas.

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Interesting stereo widening effect
by Rich Caloggero 29 May '08

29 May '08

This "algorithm" such as it is came from an old amplifier. I think it was a Carver amp circa 1978. It used all analog circuitry to do the following (never actually heard the beast, but always wanted to implement this to see what it sounded like). Now, thanx to chuck, I have. I'm sure the original implementation didn't have randomly varying delay line lengths! <smile> The idea is that you feed the right channel back to the left inverted and with delay. Do the same to the left. Its supposed to cancel out the "crosstalk" between the channels thus subjectively "widening" the image. Try it with headphones. If you crank up the gain, then you'll hear it better through speakers. Thanx to the person who helped me with the inversion (sorry I forget your name, but you know who you are <smile>). Here's the code: // gain (higher produces more noticable effect) 0.4 => float gain; // whether to invert 1 => int invert; // delay time range 1.0 => float minDelay; 10.0 => float maxDelay; // sound file "music.wav" => string sourceFile; if (me.args()) me.arg(0) => sourceFile; // the patch SndBuf l, r; Step lInverted,rInverted; DelayL dl, dr; l => dac.left; if (invert) l => lInverted => dl => dac.right; else l => dl => dac.right; r => dac.right; if (invert) r => rInverted => dr => dac.left; else r => dr => dac.left; // set initial delay length, gain, and max delay times .2::second => dl.max => dr.max; 4::ms => dur lDelayTime => dur rDelayTime => dl.delay => dr.delay; gain => dl.gain => dr.gain; // load the file sourceFile => l.read; sourceFile => r.read; 1 => r.channel; // start the inverters if (invert) spork ~ inverter(l, lInverted); spork ~ inverter(r, rInverted); // time loop 0 => float whichDelay; while( true ) { .4::second => now; Math.rand2f(0,1) => whichDelay; //<<<whichDelay>>>; if (whichDelay > .5) { Math.rand2f(minDelay,maxDelay) * 1::ms => dl.delay; //<<<"left">>>; } else { Math.rand2f(minDelay,maxDelay) * 1::ms => dr.delay; //<<<"right">>>; } // which channel to affect } // main loop fun void inverter(UGen in, Step out){ while(true){ - in.last() => out.next; 1::samp => now; } }

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check audio devices and set audio input
by COLORSOUND 28 May '08

28 May '08

hi guys , I,m fresh new user , i,m completly lost , How can check which devices chuck recognise in my computer ? and more important how do i set from which channel the audio is coming for recording an audio file ? I download this file for getting the recording order from vvvv , but dont see where to set the aduio recording input : WvOut w; OscRecv recv; 6449 => recv.port; recv.listen(); recv.event( "/record, i, s" ) @=> OscEvent @ oe; int isRecording; 0 => isRecording; adc => dac; while( true ) { oe => now; while( oe.nextMsg() ) { int record; string filename; oe.getInt() => record; oe.getString() => filename; if (record == 1 && record != isRecording) { 1 => isRecording; filename => w.wavFilename; adc =< dac; adc => w => dac; <<< "record: ", filename >>>; } if (record == 0 && record != isRecording) { 0 => isRecording; adc =< w =< dac; adc => dac; <<< "stopped." >>>; } } } thanks hope i,m sending this to the right email .

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How to Invert Phase of a Signal
by Rich Caloggero 27 May '08

27 May '08

OK, I'm a total beginner at all this dsp stuff, so forgive ... One way of subjectively "widening" a stereo image is to do the following: feed the left channel back to the right with a short delay, inverted; feed the right channel back to the left with a short delay, inverted; By inverted, I mean change the sign of each sample (assuming we have floating point samples). So now the newbie question: how do you invert the signal? I have the rest of the algorithm here: // note: sndbuf only seems to read in one channel of the source, so use one file for each channel of stereo source // sound file "r.wav" => string right; "l.wav" => string left; // the patch SndBuf l, r; DelayL dl, dr; l => dac.left; l => dl => dac.right; r => dac.right; r => dr => dac.left; .2::second => dl.max => dr.max; 15::ms => dl.delay => dr.delay; 0.4 => dl.gain => dr.gain; // load the file left => l.read; right => r.read; // time loop while( true ) { 1::second => now; } -- Rich

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Crashage
by Kassen 27 May '08

27 May '08

Look! A new way to crash; ------------------ <<<5 => int number>>>; ------------------- Sometimes one line is all it takes, use it to amaze your friends before the dev's hear about it! (works in the mini and terminal, both Windows and Linux, likely elsewhere as well). Will at to WiKi. Kas.

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length of Rhodey
by Atte André Jensen 27 May '08

27 May '08

Hi Is it possible to control the length of notes produced by Rhodey? -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk

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Re: [chuck-users] Neural Nets in ChucK
by Inventor-66＠comcast.net 27 May '08

27 May '08

Kassen et al, I'm comfortable with neural nets, I like the feedforward type with backprop because that's the old standby of neural nets, works great as a pattern recognizer. I trained some ChucKian little-bitty neural nets to do some music processing and they seemed to work OK, though in my implementations they might have learned the "null pattern" of becoming a pass-thru netowrk. I'd enjoy having native neural net capability so I can do more work with more neurons as implementing them in the signal chain is expensive. Maybe one day ChucK will run on multiple processors and we could dedicate some of those processors to neural net processing. Anyways, nets are fun and if you've had some intro to them then all the better. Best wishes, Les (Inventor) http:://www.freedomodds.com/music/

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reverb with controllable length?
by Atte André Jensen 27 May '08

27 May '08

Hi Do we have a reverb with controllable length (~ room size)? The manual states only .mix as a parameter for JCRev, NRev and PRCRev... -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk

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Re: [chuck-users] Neural Nets in ChucK
by Inventor-66＠comcast.net 26 May '08

26 May '08

Hi Kassen, I read about it in this previous message from this mailing list, see item 2. Maybe I'm confused. I'm easily amused and easily confused! Haha! Les Hi Nuno, This would be a great application for our new SMIRK toolkit (small music information retrieval toolkit for MIR in ChucK), soon to be up at http://smirk.cs.princeton.edu. This is a great example of a problem that could be easily solved with a machine learning algorithm, wherein you 1) Extract features from a training set of animal sounds 2) Use them to train a classifier (now available in chuck: kNN, adaboost) 3) extract features from the mic input 4) use the trained classifier to classify the new inputs You could start with playing with FFT, centroid, RMS, rolloff, and other standard features, then use whatever features end up capturing your idea of similarity the best. I'll send a notice to this list once everything is totally up. Cheers, Rebecca

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