Pd-list June 2008

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124 participants
197 discussions

Re: [PD] better tabread4~
by Matt Barber 24 Jun '08

24 Jun '08

Hello, The speed of this conversation makes me a little uncomfortable. Perhaps [tabread4~] is not so weird after all: if I'm not mistaken, this is algebraically identical to the interpolation used in csound's opcodes (e.g. oscil3)... I'm pretty sure both are piecewise Lagrange polynomial interpolators (with x_i values equal to -1, 0, 1, and 2, and interpolation between x=0 and x=1). There seems to be, then, at least some consensus about what generic "cubic interpolation" means, given csound's rather long history to sort this out (though, I'm surprised they haven't pulled together some of the algebra to reduce the number of divides... maybe this leads to a more accurate result?). I would be a lot more comfortable if it could be established exactly what kind of cubic interpolation is in the [tabread4c~] -- this would help with the naming standards as well. Whatever new algorithms become available should be extended to the vd~ class (or copies thereof) as well. BTW, the naming difference between csound's "oscil3" and [tabread4~] (one has 3 and the other 4) seems justified, since csound will automatically calculate the two extra guard points you need (tables in csound can come with one guard point, but not more, so the 3 is a clear reminder that it's doing cubic interpolation), and in PD, the guard points should be put in the table by hand (so the 4 is a reminder that it's always using 4 points). This is one important reason [tabread_transpose~] and the like should not be implemented, unless the guard points are automatically generated in the object class. For the value of the consumer I appended the relevant code snippets... Pd code, from d_array.c: a = wp[-1].w_float; b = wp[0].w_float; c = wp[1].w_float; d = wp[2].w_float; cminusb = c-b; *out++ = b + frac * ( cminusb - 0.1666667f * (1.-frac) * ( (d - a - 3.0f * cminusb) * frac + (d + 2.0f*a - 3.0f*b) ) ); csound code, from OOps/ugens2.c: MYFLT frsq = fract*fract; MYFLT frcu = frsq*ym1; MYFLT t1 = y2 + y0+y0+y0; ar[n] = amp * (y0 + FL(0.5)*frcu + fract*(y1 - frcu/FL(6.0) - t1/FL(6.0) - ym1/FL(3.0)) + frsq*fract*(t1/FL(6.0) - FL(0.5)*y1) + frsq*(FL(0.5)* y1 - y0)); > Date: Mon, 23 Jun 2008 14:17:36 +0200 > From: Roman Haefeli <reduzierer(a)yahoo.de> > Subject: Re: [PD] better tabread4~ > To: pd-list(a)iem.at > Message-ID: <1214223457.6003.11.camel@yoyo> > Content-Type: text/plain > > On Mon, 2008-06-23 at 06:52 +0100, Andy Farnell wrote: >> >> Yes that'right, hmm I guess I knew that but said it in a woolly way >> >> Amend that to >> >> [tabread~] - "play back at exactly" the original rate >> [tabread4~] - "play back at close to the orginal rate" >> [tabread4c~] - "play back with wider transposition" > > > i don't see any justification to keep [tabread4~] in this list. cyrille > once mentioned that his new class isn't computationally more expensive. > if there is a difference between [tabread4~] and [tabread4c~], then it > is, that [tabread4c~] is _better_ than [tabread4~] (according to some > previous posts regarding this subject). > the only good reason to keep [tabread4~] in pd is to keep backwards > compatibility with patches that exploit [tabread4~]'s wierd behaviour, > imo. > > roman

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convolution tutorials?
by David Schaffer 24 Jun '08

24 Jun '08

Hi there, I'd like to learn fft/convolution methods (especially to build reverbs or amp. simulation patches), does anyone know of good tutorials around? Thanks a lot! D.S http://www.flickr.com/photos/schafferdavid/ http://audioblog.arteradio.com/David_Schaffer/

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wiimote and guitarHero Wii
by l＠sergivalverde.net 23 Jun '08

23 Jun '08

hello, i want to use the guitar hero wii guitar with Pd. Actually is a wiimote inside a guitar hero axe,and the connection between the computer is via bluetooth with the wiimote. Seems like the wiimote + nunchuck. Have any of you test it yet? Can i use the same wii library to pd or darwinmote to play it? thanks in advance... sergi.

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GEM counter, alternate and friends
by rainer _ 23 Jun '08

23 Jun '08

...where are they gone in GEM ver: 0.91.1 'tigital' ??????? This breaks approx. 99,99999999% of my patches. best regards, Rainer _________________________________________________________________ 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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wiimote and guitarHero Wii
by l＠sergivalverde.net 23 Jun '08

23 Jun '08

hi list, i want to use the guitarhero wii guitar with pd. it´s actually a wiimote with some more buttons and a whammy bar... please see the attachment. The connection is via the wiimote(bluetooth). do you test it yet? thanks in advance. sergi.

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seeking graphics for PD FLOSS Manual
by Derek Holzer 23 Jun '08

23 Jun '08

Dear PDeople, I'm looking for a volunteer to do some simple graphics and icons for the Pure Data FLOSS Manual. The general description of the images needed follows. Please get in touch with me so we can discuss them a bit more in depth if you are interested to help. PD FLOSS Manual: http://flossmanuals.net/PureData/ ----TO DO BY CHAPTER LIST----GRAPHICS/ICONS ONLY---- # Pure Data # Introduction ---cover image, important! # WhatIsGraphicalProgramming ----icons/graphics to go with concepts in text ----icons of modular synth with patch cables or similar analog "patching" ----flowchart of inputs and outputs between PD and audio, MIDI, network, video, Arduino/motors, etc ----chart describing relationship of PD to Externals # WhatIsDigitalAudio ----icons/graphics to go with concepts in text ----icon of speaker cone movement ----icon of microphone to voltage to soundcard ----icon of soundcard to voltage to speaker movement ----icon of clipping audio (I can probably do this in PD) ----icon/graph illustrating Nyquist foldover (I can probably do this in PD) best! Derek ps... I'll be sending a call for people to contribute specific chapters soon as well.... -- derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/macumbista ---Oblique Strategy # 183: "When is it for?"

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still the long load time - pd ext
by João Pais 23 Jun '08

23 Jun '08

Hi, going back to the subject of the long loading time of patches: before I suspected that it was due (besides some difference in the newer version) to several nested gops. that's not the case, as after switching off the gops it still takes as long (or maybe slightly less, but still too long). Ah, and I think I didn't say: while all this time the patch is loading, cpu is at 100%. XP, Pd version 0.40.3-extended-20080603 Or was there already improvements in this area? I don't go download the nightly builds each day, because sometimes they're unstable. JoÃ£o Pais -- Friedenstr. 58 10249 Berlin Deutschland Tel +49 30 42020091 Mob +49 162 6843570 jmmmpais(a)googlemail.com skype: jmmmpjmmmp http://www.puredata.org/Members/jmmmp IBM Thinkpad R51, XP, Ubuntu GG Pd-Ext-0.39-2-t5, Pd Van 0.40-t2

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[PD-announce] piksel08 - code dreams :: open call
by 220hex 23 Jun '08

23 Jun '08

<<<<<<<<>>>>>>>> **Piksel08: code dreams december 4-7 2008 Bergen, Norway How does code dream? What are the dreams of code? Piksel08 examines the other side of code, an alternative side to a hard-coded reality of work and play. Open hardware and free software project a utopic vision, yet exist within economies of capital, the dream factory of mainstream technology. Within the chance meeting of sewing machine and umbrella on the dissecting table, hardware and software are flattened. Piksel08: code dreams explores the dreams of this soft machine; bachelors coding for pleasure, reverse engineering paranoiac constructs of the real, automatic coding practice, soft hardware, and everyday magic. <<<<<<<<>>>>>>>> **open call: 1. Installations Projects related to the code dreams theme including but not restricted to: reverse engineering, soft hardware, code poetry, novel instruction sets, invisible exploration, ghosted computation... programmed by and running on free and open source software and/or open/DIY hardware. 2. Audiovisual performance Live art realised by the use of free and open source software. We specially encourage live coding and DIY hardware projects to apply. 3. Software/Hardware Innovative DIY hardware and audiovisual software tools or software art released under an open licence. <<<<<< Deadline - august 15. 2008 >>>>>> Please use the online submit form at: http://piksel.no/piksel08/subform.html or send documentation material - preferably as a URL to online documentation with images/video to piksel08 [AT] piksel [DOT] no <<<<<<<<>>>>>>>> **subsections: **real code real.co.[de][re] actively explores code which has strong effects on the real, constructing the world through prediction and description. The twelve hour real.co.[de][re] session will attempt the active construction of a working code model (of any form) which addresses a flattening of the distinction between software and hardware, to resolve a new political reference for real core code. **abstract code Abstract code is software whose results can be invisible, a software implementing different layers of action at the same time. Abstract code is a connection to parallel worlds, a poetic formula dealing with outer forces. Code is art, its action is subtile, effective, magic. procedural text maledictions, oracles, iambi, hymn, formula, refrains, hypnotic sentences, prayers, and other. <<<<<<<<>>>>>>>> Piksel is supported by the Municipality of Bergen, Arts Council Norway, Vestnorsk Filmsenter, Hordaland County Council and others. More info: http://piksel.no --- _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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Autosaver
by Georg Werner 23 Jun '08

23 Jun '08

Hi, when working under unstable conditions i thought about an autosaving funtion for Pd. This an abstraction i did and like to share. It does saving every x minutes as well as immediate saving with a bang. All options are explained in the help file. Georg

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Re: [PD] Size of a table
by Matt Barber 23 Jun '08

23 Jun '08

And just in case someone on the list hasn't seen this, http://crca.ucsd.edu/~syadegar/expr.html gives documentation for the expr expr~ fexpr~ objects. Table functions (including size(), sum(), and Sum() ) at the very bottom. Matt > Date: Wed, 11 Jun 2008 15:03:56 +0100 > From: Andy Farnell <padawan12(a)obiwannabe.co.uk> > Subject: Re: [PD] Size of a table > To: pd-list(a)iem.at > Message-ID: <20080611150356.3b6b6760.padawan12(a)obiwannabe.co.uk> > Content-Type: text/plain; charset=ISO-8859-1 > > On Wed, 11 Jun 2008 13:23:28 +0200 > Roman Haefeli <reduzierer(a)yahoo.de> wrote: > >> On Wed, 2008-06-11 at 12:09 +0100, Hans Roels wrote: >> > Apart from [soundfiler] I use this trick to get the size of any array >> > (audio or data) in pd vanilla: >> > (array1 = the name of an example array) >> > >> > bang >> > | >> > [expr size("array1")] >> > | >> > print >> >> hey, nice trick. thanks for sharing. >> >> roman > > Yeah, nice! Not seen that before, it's very useful. Thanks > > >> >> >> >> >> ___________________________________________________________ >> Der fr?he Vogel f?ngt den Wurm. Hier gelangen Sie zum neuen Yahoo! Mail: http://mail.yahoo.de >> >> >> > > > -- > Use the source >

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Pd-list June 2008