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

input from file?
by francis keyes 03 Nov '07

03 Nov '07

This may be a silly question but is it possible to read data into a chuck program from a file? Given the code below for example, would it be possible to store the parameters for the Std.rand2f function in a text file and have chuck read them from the file on every loop? // make our patch SinOsc s => dac; // time-loop, in which the osc's frequency is changed every 100 ms while( true ) { 1000::ms => now; Std.rand2f(30.0, 1000.0) => s.freq; }

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more LiSa notes
by Kassen 02 Nov '07

02 Nov '07

Hi, List, Hi Dan! Some notes; When the length of the loop accidentally becomes 0 I got a extreme CPU load, one different from a loop that doesn't advance time, it seems, in that quiting ChucK wasn't easily done (it started "cleaning up", then got stuck) and required a kill through the task manager. I think I would suggest ignoring the command that creates this situation (either .loopStart(), or .loopEnd(), I suppose .loop() itself could also be the final straw ) and printing a warning about the situation as this situation results in a de-facto end of the VM. When using the .rampDown() command, but then starting .play() again on the same voice before the rampDown has finished the rampDown will cut the new "note" off. This may be intended behavior? Giving a .rampUp(0::ms) when starting the new note avoids this situation so it's no real issue, just unexpected to me. I'm not sure whether this is on "the list" already but I'd also appreciate "get" method for the .rate(), that way we could get the rate, multiply it by some fraction and set it again, like we can with all other pitched Ugens. (of course this can already be done by defining a extra float that keeps track of it but this isn't so elegant). Yours, Kas.

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VIM users
by eduard aylon 02 Nov '07

02 Nov '07

Hello list, here's the new ck.vim for syntax coloring that I use and hope it is useful to others. Let me know if you think more features should be added or changed. I am not a vim expert, but I'll try my best. If vim users think it is good enough I will put it on the wiki. Eduard

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+=> now;
by Juan-Pablo Caceres 31 Oct '07

31 Oct '07

Hi, Some examples on papers 2004, like this one, http://soundlab.cs.princeton.edu/publications/on-the-fly_nime2004.pdf use things like: 100::ms +=> now; I don't understand exactly the meaning of that, but I think it should be the same as: 100::ms => now; Is that notation depreciated? Because that line is crashing ChucK, this simple program: //---------------------- <<< "now" >>>; 1::second +=> now; //---------------------- Gives a segmentation fault message (on Linux at least). Thanks for your help, Juan-Pablo

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Installing on 64bit Ubuntu?
by Eric Hedekar 31 Oct '07

31 Oct '07

Hi, I recently tried to get chuck working on my new UbuntuStudio 64bit install and I can't get it to work properly. When I "make linux-jack" it seems to go okay and the last couple lines are as follows: g++ -D__LINUX_JACK__ -c -O3 -D__CK_SNDFILE_NATIVE__ uana_xform.cpp g++ -D__LINUX_JACK__ -c -O3 -D__CK_SNDFILE_NATIVE__ uana_extract.cpp g++ -o chuck chuck.tab.o chuck.yy.o chuck_absyn.o chuck_parse.o chuck_errmsg.o chuck_frame.o chuck_symbol.o chuck_table.o chuck_utils.o chuck_vm.o chuck_instr.o chuck_scan.o chuck_type.o chuck_emit.o chuck_compile.o chuck_dl.o chuck_oo.o chuck_lang.o chuck_ugen.o chuck_main.o chuck_otf.o chuck_stats.o chuck_bbq.o chuck_shell.o chuck_console.o chuck_globals.o digiio_rtaudio.o hidio_sdl.o midiio_rtmidi.o rtaudio.o rtmidi.o ugen_osc.o ugen_filter.o ugen_stk.o ugen_xxx.o ulib_machine.o ulib_math.o ulib_std.o ulib_opsc.o util_buffers.o util_console.o util_string.o util_thread.o util_opsc.o util_math.o util_network.o util_raw.o util_xforms.o util_hid.o uana_xform.o uana_extract.o -lasound -ljack -lstdc++ -ldl -lm -lsndfile make[1]: Leaving directory then when I run "chuck moe.ck" I get: JACK tmpdir identified as [/dev/shm] Enhanced3DNow! detected SSE2 detected JACK tmpdir identified as [/dev/shm] Enhanced3DNow! detected SSE2 detected JACK tmpdir identified as [/dev/shm] Enhanced3DNow! detected SSE2 detected Segmentation fault (core dumped) Where is my problem lying? I'm of the linux age where I shouldn't have to understand how to compile from code to get things to run and the Chuck install instructions say nothing about which programs and libraries (other than libsndfile) are required etc.. to make. That info would be a very good addition on the next release.

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miniaudicle - DAC
by eduard aylon 30 Oct '07

30 Oct '07

Hello, I normally use VIM and command line and not miniaudicle, so I am probably missing something. Anyway, today I downloaded the last version of miniaudicle available from the web and found that one cannot connect to DAC. SinOsc s => dac results in the following error message: ugen's of type 'DAC' have no input - cannot => from another ugen... However SinOsc => adc yields no errors. So there's no way we can get sound from miniaudicle? strange... Eduard

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linux: 4 channel output
by Atte André Jensen 25 Oct '07

25 Oct '07

Hi I'd like to have four outputs with linux chuck. However I only have one onboard (2 channels) and an usb soundcard (2 channels). So the question is: can I use these two soundcards as a four channels device in chuck? Actually I only need dac and something like dac2 (the second soundcard). The idea is to have chuck generate click and sendit on one card, and the other is the actual music, which goes to the PA... -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk

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KBHit with miniAudicle
by Atte André Jensen 25 Oct '07

25 Oct '07

Hi I'm trying to use something like the following with miniAudicle, but it doesn't work :-( Works great with chuck. Am I doing anything wrong? Is there otherways to grap keyboard input that works with miniAudicle? Thanks in advance for any response! KBHit kb; int key; while(true){ kb => now; while(kb.more()){ kb.getchar() => key; <<<key>>>; } } -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk

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demonstrating the sampling theorem in Chuck
by jakob kaiser 22 Oct '07

22 Oct '07

Hi, As a first step into the wonderful and time consuming world of DSP<=>Chuck I want to make audible the effect of disregarding the sampling theorem. So all I'm trying to do at the moment is creating a simple down-sampler without any proper filtering. As it is said in the sampling theorem this should not create any distortion as long as my new sampling rate is at least twice as high as the highest sine wave in my input signal. However, when I'm sampling down a sine wave of for example 440 Hz in Chuck, I get a lot of funny noises long before going down to a SR of 880 Hz. For example: SinOsc inputSignal; Step stepSeq; inputSignal => blackhole; stepSeq=> dac; 440 => inputSignal.freq; 0.5 => inputSignal.gain; //takin every nTh sample of the inputSignal 10 => int n; <<<"real sample rate: " + 1::second/1::samp>>>; <<<"new sample rate: " + 1::second/(1::samp*n)>>>; //duration of the output signal 1::second => dur durationOfTest; now + durationOfTest => time timeToFinish; //don't-care-about-Nyquist-downsampling while (now < timeToFinish) { inputSignal.last() => stepSeq.next; n::samp => now; } By using a common sample-rate like e.g. 44100 Hz in Chuck this should satisfy the sampling theorem. I guess the reason, why I doesn't get a nice 440-sine wave here is because I have to reconstruct the sine wave after the down sampling with the remaining samples, as the output cannot know that they are part of a proper sine wave. Is this right? If yes, could someone give me a hint how to realize something like this? Of not, what is the real problem? My target is a downsampler which for example would produce an undistorted sine wave of 440 Hz after downsampling to 880 Hz (i.e. a working demonstration of the sampling theorem) A second and a bit stupid question: As far as I understand it, it is not possible to downsample a signal with a given SR to any new SR, but only to a new SR which is = (Old SR)/N, whereas N is a simple positive number (of course after converting the new SR to integer). Did I get this right? OK, I would be very grateful if someone could give me a hint or two. I => bed, have a nice day! Jakob _________________________________________________________________ Invite your mail contacts to join your friends list with Windows Live Spaces. It's easy! http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx…

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chuck <<-->>OSC<<-->>Python?
by AlgoMantra 18 Oct '07

18 Oct '07

If anyone could give me some pointers here, I'll be grateful: I KNOW: Python (decent), Pygame (medium), ChucK (n00bie), OSC (null) ZERO KNOWLEDGE: OSC ( I have NO idea what it is, except that it may be useful for interfacing two platforms on the same computer. I know there is a Python wrapper available, but I have no idea how to use it) I WANT: chucK to speak/listen to a python script in realtime. WHAT: The GUI is a game/visualisation in Pygame. It responds visually to messages coming in from a Chuck audio set ( is one of them a "server" type thingie?) and sends back new messages which manipulate the sound. They way the 'game' is played visually modifies the music. To put the problem simply: ChucK <<-->>OSC<<-->>Python? => ?? ------- -.- 1/f ))) --. ------- ... http://www.algomantra.com

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