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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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Re: [chuck-users] Analyse voice and choose animal
by Rebecca Fiebrink 25 May '08

25 May '08

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 On 24-May-08, at 12:00 PM, chuck-users-request(a)lists.cs.Princeton.EDU wrote: > Send chuck-users mailing list submissions to > chuck-users@lis > Hi, > > Here's what I'd like to achieve: > > There's a pool of samples of animals. There's a microphone. Someone > talks to > the microphone, the voice is analyzed and, based on a given similarity > criteria, an animal is chosen. > > To be honest I don't know how this can be done and if it is easy or > hard. > Should I try using FFT to determine, say, the main frequency and > decide from > there? Which other criteria should I be able to compare? Any links or > samples to get me started? > > Thanks, > Nuno > >

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Feature ideas
by pibsid＠suomi24.fi 24 May '08

24 May '08

I'm learning some Python now and I really like it. Aside my dreams of a complete PyChucK ;) I'd really like to have duck typing in ChucK. http://en.wikipedia.org/wiki/Duck_typing Here's an example of what I mean: //Let's define the following UGens: SinOsc sin; TriOsc tri; Mandolin man; //A very simple function for setting the frequency to 300 Hz //If we want to use it with the UGens we've defined we'll need three different versions: fun void setFreq( SinOsc sinosc ){ 300.0 => sinosc.freq; } fun void setFreq( TriOsc triosc ){ 300.0 => triosc.freq; } fun void setFreq( StkInstrument stkinstrument ){ 300.0 => stkinstrument.freq; } //With duck typing we would only need one: fun void setFreq( ugen ){ 300.0 => ugen.freq; } //end of example What do you think, would this be a nice feature to have? Is there a reason why is ChucK is so strongly typed? Another feature that I'd like to see is score timing that supports tempo changes. With the basic timing scheme things go easily out of sync if you change the tempo on the fly. So I'm asking for global tempo control, score duration ( sdur ), score time ( stime ) and score now ( snow ). The type sdur would measure beats in quarternote durations. The type stime is an absolute measure of score duration. snow holds the current score time measured in quarternote beats. So calling: 12::whole => snow; would advance score time by 12 whole notes and take tempo changes that other shreds might make in to account. I know this might unnecessarily complicate ChucK and similar score timing scheme can already be made in ChucK as it is (using floats instead of sdurs). I'm posting to the list to get some discussion and feedback before wikifying these feature request. -Pyry Pakkanen ( Frostburn )

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Re: [chuck-users] Simulating environmental audio
by Inventor-66＠comcast.net 23 May '08

23 May '08

Hi Jeff, We recently did a group study on environmental sounds in the ChucK forum. There was wind, rain, and thunder plus ocean and birds. I'd suggest cruising on over to the ChucK forum and looking for a fairly recent topic in the listings, perhaps within the most recent few pages. Good Luck, and post again or to the forum if you can't find it - it *is* there! Les Hall (Inventor) http://www.freedomodds.com/music/

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I like 8bit Music.. was Re: I like alias-noise and 8bit
by Renato Fabbri 22 May '08

22 May '08

I understand that chuck can do way more than this, but It seems to me that chuck is a really good tool to make this kind of music: http://www.8bitpeoples.com/ (have to do some harvesting, but i found some interesting things there) Is anyone doings this things in chuck? ciao, renato 2008/5/22 Atte André Jensen <atte.jensen(a)gmail.com>: > Kassen wrote: > > Here you go; This example should be quite clear and suitable for extending >> for your own purposes, I think, but if I'm wrong please do shout. >> > > Thanks, I tried your code and it works just great! > > > -- > peace, love & harmony > Atte > > http://atte.dk | http://myspace.com/attejensen > http://anagrammer.dk | http://modlys.dk > _______________________________________________ > chuck-users mailing list > chuck-users(a)lists.cs.princeton.edu > https://lists.cs.princeton.edu/mailman/listinfo/chuck-users >

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