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Re: [chuck-users] Filters and filter education
by Julius Smith 22 May '14

22 May '14

I like to think of phasing as an approximation to and generalization of flanging, which is easier to understand. In both cases you are basically mixing two copies of the input signal where one copy is delayed relative to the other. This relative delay causes cancellation ("notches") at frequencies where the two signals are out of phase. - Julius At 02:55 AM 5/22/2014, Stuart McDonald wrote: >I've been periodically fussing over trying to construct a phaser (the >effect, not the fictional weapon) and while there's a working ChucKian >example at http://electro-music.com/forum/viewtopic.php?t=23264 , I'd >like to understand more about what's going on. > >The example uses a PoleZero filter, which may as well be called >PixieWand for all I know what it actually does. There are numerous >other filter UGens as well; I think there may be a whole world of >filtration out there I can't even imagine. > >The ChucK documentation doesn't provide descriptions of the mechanics >of these filters. I get the impression that they're things you're >expected to understand if you have a formal background in DSP, and if >you don't, well, it's a bit of a leap to get there. > >For now I'm optimistic I can get educated in some way. A 2006 post on >this subject on this list >(https://lists.cs.princeton.edu/pipermail/chuck-users/2006-June/000763.html) >suggested reading Real Sound Synthesis for Interactive Applications >(http://www.amazon.com/Real-Sound-Synthesis-Interactive-Applications/dp/1568…) >by Perry R. Cook. > >The book looks promising, but I'm not sure if it tackles the subject >to a depth that would be helpful. Has anyone read it and could >recommend? Perry, what do you reckon? =D > >Many thanks, > > >Stuart >_______________________________________________ >chuck-users mailing list >chuck-users(a)lists.cs.princeton.edu >https://lists.cs.princeton.edu/mailman/listinfo/chuck-users Julius O. Smith III <jos(a)ccrma.stanford.edu> Professor of Music and, by courtesy, Electrical Engineering CCRMA, Stanford University http://ccrma.stanford.edu/~jos/

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How to ramp pitch?
by Bonnie Eisenman 22 May '14

22 May '14

Hi all, sorry if this question has been answered before, but I can't find it in the docs. I'd like to ramp a pitch quickly from one frequency to another. I feel like there should be a better way to do this than what I'm currently using, which is this: // Where length is the # of milliseconds this should take for (0 => int i; i < length $ int; i++) { f1 - ((i/length) * (f1 - f2)) => float newFreq; osc.freq(newFreq); 1::ms => now; } This works but it produces an unfortunate clicking noise at the end (and yup, I'm using an envelope). Any tips? Thanks! --Bonnie

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Question about new OSC support classes - OscIn
by Simon Steptoe 17 May '14

17 May '14

I was looking at the new Osc support classes. When using OscIn, I can't seem to receive more than the first character of a string. If I replace the OscIn code with the equivalent using OscRecv code then the strings come through okay. If I sent the equivalent data to a separate program - e.g. PD - then the strings also come through okay. Conversely, if I send strings from PD to ChucK then, once again, my OscIn code only picks up the first character. So, I am assuming the issue lies with my code for OscIn rather than OscOut. If anyone could put their finger on the problem, I would be most grateful. And a separate issue with .addAddress: "oIn.addAddress( "/chuck/data, ifss" )" works but "oIn.addAddress( "/chuck/data, i f s s" )" doesn't. This didn't seem to be an issue when using with OscRev/.event. Here's the code: //=========================================== OscIn oIn; OscMsg oMsg; 6452 => oIn.port; oIn.addAddress( "/chuck/data, ifss" ); "localhost" => string hostname; 6452 => int port; OscOut xmit; xmit.dest( hostname, port ); spork ~ recvOsc(); spork ~ sendOsc(); while(true) { 1::day => now; } //============================================ fun void sendOsc() { while( true ) { xmit.start( "/chuck/data" ); Math.random2( 30, 80 ) => xmit.add; Math.random2f( 0.1, 1 ) => xmit.add; "xyz" => xmit.add; "abc" => xmit.add; xmit.send(); 1::second => now; } } //============================================ fun void recvOsc() { -1 => int i; -1.0 => float f; "NULL" => string s; "NULL2" => string s2; "NULL3" => string s3; while( true ) { oIn => now; while( oIn.recv(oMsg) ) { oMsg.getInt(0) => i; oMsg.getFloat(1) => f; oMsg.getString(2) => s; oMsg.getString(3) => s2; <<< "got (via OSC):", i, f, s, s2, s3 >>>; } } } //================================================= Thanks Simon (PS - my machine is a PC running Windows Vista)

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collecting sum signal per-channel of midi-notes
by Peter Billam 09 May '14

09 May '14

Greetings. ( Serious Newbie-warning :-) So: I want to work with MIDI, and implement the Great Missing Midi-Controller, namely a per-channel overdrive distortion like the foverdrive,1196 LADSPA plugin. Untested: fun float foverdrive_1196(float x, float drive) { drive - 1.0 => float drivem1; Std.fabs(x) => float fx; return x*(fx + drive)/(x*x + drivem1*fx + 1.0); } This means I have to get the TriOsc of the note not into a dac TriOsc t => dac; // NO! but into some code which will add it to the per-channel total. I guess those totals will be stored in perhaps LiSa's ? float cha2drive[16]; // set by nonstandard MIDI controller 87 LiSa lisa[16]; // the per-channel total signal of all its notes But at this point I get brain-overload :-( How do I add the TriOsc sample to its LiSa ? How do I invoke foverdrive_1196() on each sample before outputting it to the dac ? I'm very unsure about "now", too, how it co-ordinates between code of all the individual notes and the final "=> dac" step, but still executes all these things scattered throughout the code in an appropriate order. Hope this makes sense... If I get this solved, I should become more self-maintaining... Thanks, Regards, Peter Billam http://www.pjb.com.au pj(a)pjb.com.au (03) 6278 9410 "Follow the charge, not the particle." -- Richard Feynman from The Theory of Positrons, Physical Review, 1949

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Re-direct output to file on OS X?
by Arve Knudsen 08 May '14

08 May '14

Hi guys Using ChucK on OS X, is there some easy way to re-direct its audio output to a file (for analysis)? Thanks, Arve

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Running scripts sequentially
by Gonzalo 06 May '14

06 May '14

Hi, I'm trying to run multiple .ck files sequentially. Specifically I have a 'master' file that loads all the 'child' files via Machine.add. But then of course they run concurrently. For now I'm just advancing time in the master file before every Machine.add statement (ugly...). Is there a way to accomplish this nicely? Thanks! Gonzalo PS: This is my first message to this list. I'm working on a project with Chuck that raises *a lot* of questions, so I'll probably be coming back here often. :)

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chuck vm options
by Al Matthews 29 Apr '14

29 Apr '14

Hello list. 1) Catching up a bit, it occurs to me that shell%> chuck --start `while(true) 1::second +=> now;` has been superseded by shell%> chuck --loop ; correct? Does ChucK any longer accept subprocesses or so, from the shell? 2) Also if anyone cares to distinguish or give an example for --callback Utilizes a callback for buffering (default). --blocking Utilizes blocking for buffering. then I'm much obliged as this is unfamiliar in some respects to me. Al Matthews - http://fatmilktv.com Atlanta, GA, US +1 337 214 4688

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Re: [chuck-users] curious about chuck
by Perry R Cook 18 Apr '14

18 Apr '14

Oscillators of type (XXXOsc) do accept direct input from other UGs for Phase or Frequency. You just have to set the .op mode for those. In general, UGs don't accept sample-rate ChucK connection for arbitrary parameters, as very often one doesn't really want or need those to run at the sample rate. Control rate is arbitrary in ChucK, so to update the .freq of something non-Osc type, you would make a shred that does it at your sub-sample rate. You could even do it at the sample rate, of course. Here's an example: Flute f => dac; 880.0 => float freq => f.freq; spork ~myMod(); 1 => f.noteOn; 1*second => now; 660.0 => freq => f.freq; 1*second => now; 440.0 => freq => f.freq; 1*second => now; fun void myMod() { SinOsc s => blackhole; 6.0 => s.freq; while (true) { freq * (1.0 + 0.05*s.last()) => f.freq; 10 :: ms => now; // whatever rate you like here } } // Cheers!!! PRC ----- Original Message ----- Send chuck-users mailing list submissions to chuck-users(a)lists.cs.princeton.edu To subscribe or unsubscribe via the World Wide Web, visit https://lists.cs.princeton.edu/mailman/listinfo/chuck-users or, via email, send a message with subject or body 'help' to chuck-users-request(a)lists.cs.princeton.edu You can reach the person managing the list at chuck-users-owner(a)lists.cs.princeton.edu When replying, please edit your Subject line so it is more specific than "Re: Contents of chuck-users digest..." Today's Topics: 1. Re: curious about chuck -- very basic question (Aaron Bohannon)

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curious about chuck -- very basic question
by Aaron Bohannon 17 Apr '14

17 Apr '14

After reading through the relevant parts of the language specification, I am unable to determine whether it is valid to use the chuck between a unit generator and a variable/property, like this: SinOsc s => dac; SinOsc lfo => s.freq; Obviously, anyone who's used hardware synths is going to want to do that sort of thing. I'm sure this has been discussed and debated a hundred times on this list before, so feel free to send me a link to someone else's answer. I just couldn't find any search terms that would pinpoint the issue. Thanks, Aaron

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workshopping (atlanta)
by Al Matthews 04 Apr '14

04 Apr '14

Hello again. I am undertaking as of next month a series of livecode workshops in Atlanta, in which I expect to teach or demo a fair amount of ChucK. I'd very much appreciate hearing what your teaching | learning experiences in ChucK may have been. I've mined a lot of existing ChucK material, but I certainly appreciate examples as well. Naturally I will give full authorship credit insofar as I receive it, to any borrowed examples. Thank you. Al Matthews - http://fatmilktv.com Atlanta, GA, US +1 337 214 4688

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