Pd-list February 2009

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115 participants
182 discussions

Creating a basic oscillator from first principles?
by Geoff 09 Feb '09

09 Feb '09

Hi I am very new to PD and DSP concepts. So this will be hopelessly, awfully, basic :) I have just started chapter 3 of 'The theory and technique of electronic music' which is excellent However it raises a million questions in my head...... one of which is how do I create an oscillator myself? Its really bugging me everytime I create an example from the book. I feel I need to understand the fundamentals of how the basic objects are created too. It seems too easy for me to just use the phasor object provided, So I thought I would struggle through it and try to work it out. This is how I am thinking about it. If I want to create a sawtooth oscillator then this is just a ramp function i.e. a number that increases by 1 each time. therefore if I use a simple float that, that adds 1 each time and a modulus % object to cap it, then I will have my repeating ramp wave :) However I am triggering it by the metro object which is way too slow, how can I send a bang to the float object say every sample? or alot quicker than one millisecond? My thinking is if I could speed up the bangs to a sample level I would then have more scope to then actually tune it, and create the shape I want. However I am sure to do this well would require working at a higher sample rate, but I am not really sure how to proceed. Below is my appalling attempt :) I use the number box to change pitch. Any guidance appreciated Cheers Geoff #N canvas 325 62 681 388 10; #X obj 119 69 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 -1; #X obj 121 96 f; #X obj 181 116 + 1; #X obj 115 17 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 -1; #X obj 127 238 dac~; #X obj 118 46 metro 1; #X floatatom 187 163 5 0 0 0 - - -; #X obj 115 160 %; #X obj 114 199 /; #X connect 0 0 1 0; #X connect 1 0 2 0; #X connect 1 0 7 0; #X connect 2 0 1 1; #X connect 3 0 5 0; #X connect 5 0 0 0; #X connect 6 0 7 1; #X connect 6 0 8 1; #X connect 7 0 8 0; #X connect 8 0 4 0;

3 6

Mapping question
by Mike McGonagle 09 Feb '09

09 Feb '09

Hans, I was looking at some of the mapping abstractions, and I noticed that both the "breakpoint_smooth" and the "elliptic" objects are the same thing. Is this supposed to be? Mike -- Garry Shandling - "I'm dating a woman now who, evidently, is unaware of it."

2 1

urgent - cpu going to 100% / top weirdness
by Damian Stewart 09 Feb '09

09 Feb '09

hey, i'm setting up for an exhibition in Madrid that opens on Tuesday (it's called VIDA and it's at Matadero Madrid, come down if you're in town.) so, i'm trying to track down a strange issue with Pd jumping to 100% cpu periodically, once every 15 seconds, when i run another cpu-intensive task. i'm running Pd 0.40-2, installed via apt-get on Ubuntu 8.04. (i have the same issue with the Pd-extended 0.40-3 .deb from the puredata.info website). this is on a dual-core Pentium-D 3GHz cpu. i'm using ALSA with an MAudio Delta 66 card. (linux is *so* not ready for multichannel audio unless you've got a high end RME device, but that's another story). if i start up top, and just run pd, it chugs along fine. the cpu usage line at the top edge of the screen in top stays around 20%us, with around 80% idle time. and the entry for Pd gives a CPU usage of 63% (i don't understand what these two values mean or why they differ) if i then start up a cpu-intensive graphical task that sits around 100% but is only single-threaded, the weirdness begins. in top, the total CPU usage line jumps up to 70%. in the listing of processes below, the cpu-hungry graphical task sits on around 97%, but the Pd process is now down to 36%. after running for around 30 seconds, the Pd process jumps up to 100%, totally killing the framerate on the cpu-hungry graphical task. it stays like this for 10 or so seconds, then drops back down to 36%, before repeating the cycle again after another 20-30 seconds. i tried running pd with -nogui and -rt -- no change. i also tried running pd with niceness -10 and the graphical task with niceness 10 -- again, no change. so, questions. first, wtf? why is top reporting a lower cpu usage in the second scenario than in the first? second: how can i stop this? third: it's possible this is being caused by an almost-infinite loop in one of my patches. how can i profile them to test this? thanks d -- damian stewart | skype: damiansnz | damian(a)frey.co.nz frey | live art with machines | http://www.frey.co.nz

2 1

smooth without dsp objects
by punchik punchik 08 Feb '09

08 Feb '09

Hi , is there any version of the smooth abstraction but without dsp objects? i want to use for smoothing change of parameters on gem visuals and i would like to have the pd dsp turned off. Any idea of an abstraction that does the same without "~" objects or an object? if not, which is the best way to build one that doesnt consume too much cpu? thanks pun..

4 3

turn off gem subpatches
by punchik punchik 07 Feb '09

07 Feb '09

Hello! i have a patch that has 3 gem subpatches, each one has complex iterative structures , since each one should be visualized at a time, is it possible to turn off the 2 subpatches that are not viewed at any time? im asking this because having this 3 subpatches consumes all of my cpu because each one have a lot of repeats objects, is it possible to turn off the subpatches im not using? ive tried to turn off the gemhead sending a 0 to it and the structures doesnt appear anymore but they are still consuming my cpu , is there any way of turning off this gem processes- subpatches? any advice would be appreaciated thanks pun.

4 3

[PD-announce] Formations Pure Data
by Jack 07 Feb '09

07 Feb '09

Hello list, Sorry only in french : Il se tiendra le 14 et 15 février prochain deux workshops Pure Data à Mains d'Oeuvres à Saint-Ouen. Le workshop du 14 février s'adressera aux débutants et celui du 15 février aux personnes qui connaissent déjà l'environnement. 11H > 18H Salle STAR TREK (deuxième étage) Par jour : 20 EUR TP - 15 € TR (Audoniens, chômeurs, étudiants, Rmistes) Plus d'infos sur : http://www.craslab.org Pour les inscriptions : formations(a)craslab.org ++ Jack _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

1 0

pix_record on pd-extended in Windows broken?
by John Harrison 07 Feb '09

07 Feb '09

when opening pix_record help patch on Pd-extended 0.40-3 released version we are getting a error: filmQT: Could not initialize quicktime: error -2093. When trying to record (I assume .mov is the only option) we get "error: recordQT : CreateMovieFile failed with error -2095." How do we record video in Windows using Gem/Pd-extended?

2 1

new/open/saveas initialdir behavior in Pd-devel
by Hans-Christoph Steiner 06 Feb '09

06 Feb '09

Hey all, I just worked out a new scheme for the initial directory for File -> New and File -> Open: menu_open_dir: - starts in pwd - is updated to the dir of the previous File -> Open menu_new_dir: - starts in pwd - updated on every File -> Save As to that dir - updated to path of current patch whenever focus changes - when Pd window gets focus, menu_new_dir is set to pwd This means when you create a new window, it starts in the directory that you are currently working in, which is a huge improvement, IMHO. Thoughts? .hc ---------------------------------------------------------------------------- All mankind is of one author, and is one volume; when one man dies, one chapter is not torn out of the book, but translated into a better language; and every chapter must be so translated.... -John Donne

1 0

problem with plugin~ and dssi~
by Ivica Ico Bukvic 06 Feb '09

06 Feb '09

Hi all, Using pd-extended 0.40.3 (deb) on Ubuntu Intrepid and when using either built-in plugin~ and dssi~ objects (also tried with dssi~ compiled from the latest available source) I get the following output before Pd segfaults: Warning: no LADSPA_PATH, assuming /usr/lib/ladspa:/usr/local/lib/ladspa no more csLADSPA plugins socket receive error: Connection reset by peer (104) Segmentation fault The warning should be fine since the default path covers ladspa plugins installed on Ubuntu. Using plugin~ by itself does this, while dssi~ if created without an argument reports missing argument (as expected) but does not crash until that argument is supplied. Both bogus and valid arguments to dssi~ crash Pd. Help file for dssi likewise crashes. This occurs both through jack and without it. I created objects both with and without DSP being enabled. Any thoughts what could be the problem? I suspect since both plugins are misbehaving that it has something to do with ladspa setup but then again what do I know... P.S. dssi~ hexter (from the helpfile) when extracted on its own, hangs for a while and then crashes pd leaving pd-gui and two "stuck" instances of hexter_gtk. Any help on this matter is most appreciated. Best wishes, Ico

4 7

another iPhone/iPodTouch OSC controller
by Max 06 Feb '09

06 Feb '09

just stubled about this (via Max-mailinglist) (from the makers of framestein) http://pinktwins.com/fantastick/ from the website: FantaStick is a minimalistic remote interface for use with software such as Max/MSP or Pure Data. With FantaStick you receive multitouch-events and issue simple drawing commands to build exactly the kind of interface you want. FantaStick is 100% widget-free! 0% OSC content! Instead of a limited set of builtin-widgets, the interface-logic resides in Max/MSP (or your software of choice) and only drawing commands are sent to the device. This leads to interfaces that work exactly the way you want - and look gorgeously minimalistic, too! Features - Minimalistic, fullscreen control area with nothing on it but what you provide. - Multitouch-events on the device are forwarded to your host via UDP. Information includes the touch state (begin, move, end) and coordinates. - Designed for no-hassle: zero-click startup, the device does not sleep or suspend network, flicker- and lag-free. - Displaying images (fetched with URLs) and caching them locally for use on non-networked locations. - Basic drawing with lines, boxes and text.

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Pd-list February 2009