Pd-list October 2010

pd-list@lists.iem.at

124 participants
181 discussions

Help needed for string manipulation in PD
by tania habib 26 Oct '10

26 Oct '10

Hello, Currently I am stuck at one point in my multichannel recording patch. The problem is that I want to dynamically read the list of wav-files from a specific folder using a text file. For this case, I am using the textfile object. One line of the text file reads like sp01_48kHz/swih7 Can there be a way of separating this line into separate strings like 'sp01' '48kHz' 'swih7' I need for instance the first string to create the name of wav-files to record the data. In addition to that is there any conditional statement (object) in PD, which I can use to only generate the wav-files, e.g., when sp01 changes to sp02 in the text file as I have 10 utterance for every speaker and I want to store them separately? I will really appreciate help in this regard Thanks, Tania

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Any Columbus, Ohio Pd Users Out There?
by brandon zeeb 26 Oct '10

26 Oct '10

Hey all, Any PD users out there from Columbus, Ohio? If so, we should get a group together. Let me know! ~Brandon

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[PD-announce] /dev/art/#1 à Paris le 30/10/2010
by Jack 26 Oct '10

26 Oct '10

In french only (désolé pour le même mail provenant de différentes listes !). Pour une meilleure mise en page, vous pouvez consulter le PDF joint à ce mail : /dev/art/#1 Rencontres, discussions et échanges entre artistes et développeurs utilisant les nouvelles technologies de programmation (arts numériques, hacking, performances, etc.). Le 30 octobre de 14h à 18h à la Générale Nord-Est 14 avenue Parmentier / 75011 Paris Metro ligne 9 / Station Voltaire 14h / 16h : rencontres, discussions et échanges autour des arts numériques, de la performance, du hacking et du développement d'applications et d'installations. 16h / 16h30 : Pot/apéro 16h30 / 18h : performance + présentation de Jack/RYBN HPNS#002 : resonant healing principle Le principe de résonance est connu depuis la nuit des temps. Pratiqué et enseigné par les chamans, hommes/femmes médecins et guérisseurs de la planète de génération en génération, il fallut attendre l'arrivée du philosophe, physicien et médecin allemand Dessauer de Heidelberg pour qu'une structuration de ces connaissances ancestrales voie le jour dans un contexte moderne. Abordant l'être humain dans sa globalité d'un point de vue vibratoire, le Dr. Dessauer élabora en effet le concept de la nature radiationnelle des maladies, repris par le médecin américain Albert Abrams (1863-1924) qui entreprit les recherches et expérimentations nécessaires à la structuration de la méthode. Petit à petit, on coda les organes, les maladies et les facteurs irritants, ainsi que les éléments de la sphère psychique et spirituelle. Ces codages s'inscrivent dans la fréquence de la Lumière blanche, ou énergie de vie, telle qu'elle est conçue dans la tradition cabalistique. Ainsi, la technique de résonance s'adressa enfin à l'être humain dans sa globalité: physique, psychique et spirituelle. Aujourd'hui, un appareil spécialement conçu, où l'abdomen sain et la percussion ont été remplacés par des enceintes et un écran vidéo (HPNS#002), permet au praticien d'analyser chaque organe, facteur toxique, maladie, perturbation émotionnelle et déséquilibre énergétique sur le plan de sa fréquence vibratoire, qu'on ait pour point de départ un désordre sur le plan physique, une disharmonie émotionnelle, mentale ou spirituelle liée à l'usage intensif du Web. A chaque facteur repérable correspond une fréquence vibratoire précise. Le diagnostic établi, le praticien entrera en résonance - toujours à l'aide de ses instruments - avec la méthode thérapeutique adéquate pour le patient, pour un problème donné au moment de la recherche. L'éventail des possibilités est sans fin, limité seulement par les connaissances du praticien: de l'homéopathie aux Fleurs de Bach, en passant par la trousse de médecine, les essences, couleurs ou cristaux, y compris les remèdes allopathiques, les tisanes et les aliments, la méditation, les sons, la lumière ou le mouvement (durant cette représentation le praticien utilisera les sons, la lumière et le mouvement). Il appartient ensuite au praticien de décider s'il est capable ou non de prodiguer la thérapie requise. Prochain rendez-vous /dev/art/#2 le vendredi 19 novembre de 19h à 23h au BlackBoxe / 17 rue de la Chapelle / 75018 Paris _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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sample playback question
by Pagano, Patrick 26 Oct '10

26 Oct '10

Hi what is the proper way to play a sample so that if i play a table or an array with a sound in it and i trigger it to start again it will overlap or play both soundfiles at the same time? I assume it has to do with the tabplay~ object buti would love a hint on how to achieve this properly pp

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change font in pdp_ascii?
by Martin . 26 Oct '10

26 Oct '10

Hello pdpeople, is there a way to use a different font in pdp_ascii? The helpfile tells that it is possible to "load a characters map" with the same format as a file called "characters.dat", but google allmighty only returns pages about pdp saying the same thing... Does it have anything to do with fonts? cheers, martin

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Stupid arduino question
by Dafydd Hughes 26 Oct '10

26 Oct '10

Hey folks I feel like an idiot. I'm trying to get a rotary encoder to send data to Pd - I have the arduino end working fine, but I'm getting a bunch of ascii numbers coming out of [comport]. Can somebody help this poor old tired brain change them to floats? cheers dafydd

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organizing waveshapers
by ronni montoya 25 Oct '10

25 Oct '10

Hi , im sonyfing some data converting it to waveforms that im using as waveshapers. I was wondering how could i organize those waveshapers . how can i analyze a waveform to extract features that can be used for selecting each waveshaper or for organizing them? Are there are any approaches for something like this? thanks R

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dub chords in Pd
by Marco Donnarumma 25 Oct '10

25 Oct '10

Hi all, how would you suggest to synthesise dub chords in Pd? I tried some waveshaping applied to phasor chords + some resonance filters but it resulted in something totally different. thanks, -- Marco Donnarumma aka TheSAD Independent New Media Arts Professional, Performer, Teacher Ongoing MSc by Research, University of Edinburgh, UK PORTFOLIO: http://marcodonnarumma.com LAB: http://www.thesaddj.com | http://cntrl.sourceforge.net | http://www.flxer.net EVENT: http://www.liveperformersmeeting.net

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Guitar distortion (analogue) was: (Chebyshev?)
by - 25 Oct '10

25 Oct '10

Am 12.09.2010 19:24, schrieb Martin Peach: > On 2010-09-12 12:05, Mathieu Bouchard wrote: >> On Sun, 12 Sep 2010, Martin Peach wrote: >> >>> It's not the capacitors, it's the amplifier losing gain when it >>> approaches the power supply. >> >> Yeah, but it seems to be a pattern similar to the one found in >> capacitors, because capacitor theory has exp(-x) all over it, and the >> only way that capacitors behave like [hip~] is when the signal is much >> below the capacity rating (?F)... otherwise they lose gain... when they >> don't, it's because exp(-x) can be well approximated by x. >> > > I guess it's similar since capacitors charge at a rate proportional to a > voltage difference, while transistors can supply charge carriers at a > rate proportional to a voltage difference, so caps charge fastest when > they are nearly empty and transistors have the best gain with small > signal inputs. > > The whole universe has exp written all over it in fact... > >> And then, exp is very close to tanh in several different ways, one of >> them being this (use gnuplot) : >> >> plot [-2:2] [-1:1] exp(x*sqrt(2))-1, 1-exp(-x*sqrt(2)), tanh(x), x >> >> I put the plain 'x' at the end to show what I mean above (though you >> already know that) >> > > Of course, all the hyperbolic trig functions are made from exp, by > definition. > > http://en.wikipedia.org/wiki/Hyperbolic_function > > Another use of exp is the sigmoid function used in biology, that can be > used to make a soft transition from one state to another as in 'fuzzy > logic'. > > Martin Sorry I don't know (jet) how to answer a mail from the archives. The soft clipping in a normal analogue guitar distortion (like the tube screamer) comes from the diodes (tubes are warmer). Which have log written over them (their resistance depending on V). (Are even used some time as a simple analogue log function) A analogue guitar distortion is build via a feedback loop like this: |--var resistor (gain) |---- ->diode -| |---- <-diode -| |----cap as lp -| | | |------ (-) | op-amp---|---out input-- (+) The resistor defines the max gain The cap is used as a lp (short cuts high frequency's to a gain of 1) An op-amp tries to have always the same voltage at both inlets. Which means if you have 1v at + it increases its output till you have 1v at - as well. 1+(-1)==0 And finally the diodes: At negative voltages they blockade completely At low voltages they have a high resistance so the gain of the resistor counts. At around .7V their resistance drops leading to a lower gain. With a tanh(sig) you are simulating the diodes in a simple way. What usually is forgotten in the digital domain is the lp filtering. You may want to split your signal into a high and low part. Run the low part through the tanh and sum it later up with the high part. It gets really funny if you want to try to model the whole feedback loop in something like pd. There is a mess of phase changes and whatnot which surely is part of the interesting analogue sound. An important thing to mention is that, as someone else noted, you need to (should) oversample to avoid aliasing with high order functions. Tanh is one of the worst because it generates very high harmonics. Where in the analogue field a natural lp filtering happens all the time (and no aliasing can occur). As an Example: An opamp has a frequency response up to GHz. But only at a gain of 1. The higher the gain the lower the frequency response. I'm bad at explaining things. But if you want to i can search my bookmarks for the analogue or digital sources i tried to explain here.

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Re: [PD] Music made with Pd
by Marco Donnarumma 25 Oct '10

25 Oct '10

Hi Pierre, nice music! Yes, it's interesting to listen to Pd played in a rock band. M From: Pierre Massat <pimassat(a)gmail.com> > Subject: [PD] Music made with Pd > To: pd-list <pd-list(a)iem.at> > Message-ID: > <AANLkTin3+e=M6R4Y0M1rwa9y72LJ0L1fTR01GrcQY7F_(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi everyone, > > I just wanted to share some music i've made with my band, because i've used > Pd with my guitar and a rt setup and i'm very happy with the results. I > remember when i started experimenting with this a year ago, i had hope but > i > did not expect it to work so well. So here it is : > http://pierreetleloup.bandcamp.com/ > There's some Pd-processed guitar on the following songs: Not too sad, > Nyctalope, Canop?e and We own the sky. The rest is just plain rock trio > stuff (irrelevant here). There's no keyboard and i didn't need any hardware > effetcs. > > So this gives me an opportunity to thank everybody on the list, it's really > neat to always have someone who can help you and provide a bit of code! > > cheers! > > Pierre > -- Marco Donnarumma aka TheSAD Independent New Media Arts Professional, Performer, Teacher Ongoing MSc by Research, University of Edinburgh, UK PORTFOLIO: http://marcodonnarumma.com LAB: http://www.thesaddj.com | http://cntrl.sourceforge.net | http://www.flxer.net EVENT: http://www.liveperformersmeeting.net

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Pd-list October 2010