Pd-list March 2010

pd-list@lists.iem.at

152 participants
270 discussions

latency solutions... and then some
by Jeffrey Concepcion 02 Apr '10

02 Apr '10

Hi, y'all. i'm starting to get the hang of pd now (about a year in to it), my main interest in using pd would be to create effects for processing my instruments (primarily electric bass and acoustic drums) and accessing them via an arduino footswitch and/or an arduinome i plan on making. My problem is that i can't achieve a low enough latency to have a useful patch in a live performance setting. so i have a few questions, if i can get as many of you to answer them, maybe we can have a standard setup for this type of processing (i apologize if this is common knowledge to many pders): - in terms of processor capacity, hardware, and sound card configuration, what would be the minimum requirements to achieve unnoticeable latency (not hear the affected signal as a slap-back type of effect)? i've read that 11ms can be achieved and is unnoticeable. - what is your setup for live processing? what do you think is the ideal setup for live processing? (i'd like you read Miller's thoughts on this) - what do you think will be the next big step in making sound art, be it musical, online group performances, new interfaces, whatever? (kind of a personal question, i know, but bear with me) My thoughts on the last question: i'm intrigued by photonics<http://en.wikipedia.org/wiki/Photonics>, from what i understand, the amount of information handled is gargantuan when compared to electronics, and that would mean that electronic musicians (or would we then be photonic musicians?, sounds catchy) would no longer have to consider the limitations our equipment when composing/performing and our imagination would truly be the only limitation. sorry if i seem romantic about it, but it seems like such an interesting possibility. here<http://emusician.com/futuretech/photonics_technology_electronic_musicians/>'s an article by EM -- www.avmachinists.org Puerto Rico based Art Collective/ Non-Profit Org

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propertybang-help
by Jonathan Wilkes 01 Apr '10

01 Apr '10

propertybang-help.pd says that [propertybang] is per abstraction, but it's per abstraction _instance_, right? Also, it states that you can't have them per subpatch-- what exactly does this mean? Thanks, Jonathan

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Re: [PD] Combat aliasing!
by Matteo Sisti Sette 01 Apr '10

01 Apr '10

> Correct, nothing played back at original sampling rate will alias. It _won't_ alias; it may already _have_ aliased when sampled in the first place. Aliasing occurs when sampling. When you digitalize (ADC), you are sampling. When generating a waveform mathematically, you are sampling the mathematical function at the very moment you compute its value at discrete points. When you play back a signal at a different speed than the original, you are _resampling_ it, that is, theorically, interpolating it and then sampling it again, and it is the sampling stage, not the interpolating one, that produces the aliasing. The interpolation, since it cannot be an ideal interpolation, may introduce other noises or artifacts, not aliasing as far as I can see. -- Matteo Sisti Sette matteosistisette(a)gmail.com http://www.matteosistisette.com

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mapping_video
by kubriel 01 Apr '10

01 Apr '10

hallo, i made quite user friendly projection mapping abstraction for video. it is based on curve3d(thanks to iohannes), but with useful and fast interface, as you know from moving rectangles in inkscape. i used it to make this instalation http://www.direkt.sk/_/bx/feedback/13.jpg this is, how the interface looks http://www.direkt.sk/_/mapping_video.png http://www.direkt.sk/_/mapping_video.zip mapping_video.zip, (5,9Kb): mappingvideo-MAINPATCH.pd - to check whats going on try this pytagoras.pd vertex.pd videoplayer.pd stred_bodov.pd video_ext.pd - this is the object itself it is pretty big mess, i know. also names of abstractions are not very clean, i can make it better if somebody wants to modify it. it is only what i used, i offer to you, with hope to help somebody have a nice day

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GEM strange problem with fonts
by Jose Luis Santorcuato 01 Apr '10

01 Apr '10

Dear List, i stay working in a interactive project for Museum... the Aymara culture, i work with audio, videos and fonts in GEM in a Blackbook with 10.5.8 osx, all works fine, GEM shows the fonts, videos and the sound is fine, but when i put the same folder in other mac the fonts dont appear...audio and video yes... I connect in net the two computers, works... but the fonts... is very crazy... the other mac have a 10.6.2.... i test in other mac with 10.5.6 .... Whats is wrong? I send the programs Best regards from Chile José -- http://www.chilemigra.cl http://arselectronicachile.blogspot.com http://www.myspace.com/santorcuato

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tabread4~ "broken" interpolation algorithm - was Re: Max Smoother Audio than Pd?
by Mathieu Bouchard 01 Apr '10

01 Apr '10

> A workaround is to up-sample everybody by a factor of 2 - this > dramatically reduces error, usually by 24 dB. Every upsampling is some kind of interpolation. So what you mean, is to reduce the error of your interpolator by getting much of the job done by a different interpolator instead ? _ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard, Montréal, Québec. téléphone: +1.514.383.3801

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Combat aliasing!
by Pierre Massat 31 Mar '10

31 Mar '10

Hi! I ve been reading the on-going debate about interpolation for a few days, and it just occured to me that i don't how go about avoiding aliasing more generally than with band-limited wavetables. If i wanted to play a sample at a pitch higher than the original, or if i wanted to use a karplus-strong resonator to generate notes, what would be the proper way of ensuring that no aliasing occurs? Do people generally use low-pass filters with a cut-off somewhere below the Nyquist frequency? Or is there a trick that one can use earlier on in the signal path of a patch? Pierre

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GEM: possibility to split gemframebuffer or gemlist?
by Johannes Paar 31 Mar '10

31 Mar '10

Hi, is there a way to split the gemframebuffer, so that I can split 1 gemlist to be rendered on 2 objects, with each object showing only half of the image? Like that the two final objects could act as independent canvas for projection mapping. Thanks a lot & best Johannes

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Re: [PD] tabread4~ "broken" interpolation algorithm - was Re: Max Smoother Audio than Pd?
by Charles Henry 31 Mar '10

31 Mar '10

> I don't know either. We have the formulas for each, so we can > calculate squared error vs. sinc(x), but there also appears to be > differences in which frequencies the distortion occurs and some could > be more audible. It occurs to me that there exists one very obvious function for which the squared error is minimized for a 4-point interpolator. 4-point interpolator impulse functions have to be 0 outside the interval [-2,2]. So, E=|f(x)-sinc(x)|^2 is minimized when f(x)={sinc(x) -2<x<2 , 0 elsewhere Note that since the Fourier transform is isometric and linear, we know that a function which minimizes the error in the time domain also minimizes error in the frequency domain. This spectrum ought to have a lot of ringing in the upper frequency range, and in the stopband. So, if we only considered the squared error in the reconstruction and not the smoothness of the result, this would be the clear choice. How would we factor in the smoothness as well?

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pd.exe as a virus
by Ricardo Dueñas Parada 31 Mar '10

31 Mar '10

Hi, I´m recently being adviced that pd.exe is a virus, exactly with AVG antivirus, do you know the reason for that? Ricardo.

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Pd-list March 2010