Pd-list December 2011

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80 participants
108 discussions

Re: [PD] integer (mis)calculator
by katja 12 Dec '11

12 Dec '11

On Thu, Dec 8, 2011 at 1:06 PM, Eduardo Flores Abad <mail(a)eduardoflores.de> wrote: > Hi Katja, > > tries to round this way: > > 100 * (7.1 - 7) / 100 = 0.1 Did you try that, Eduardo? In Pd, you get: 100 * (7.1 - 7) / 100 = 0.0999999 But: ((100 * 7.1) - (100 * 7)) / 100 = 0.1 Or: ((10 * 7.1) - (10 * 7)) / 100 = 0.1 That is: (71 - 70) / 10 = 0.1 So this is what Roman already suggested: do subtraction (or addition) with integers, to be sure they're exact (up till 2^24), then scale if required. The original quest was to split two digits, which can be done like so: truncate(71/10) = 7 71 - (truncate(71/10))*10 = 1 Where truncate() is done with the [i ] object. This works for all two-digit ints, for more digits there would be similar solutions. The main point is: integer subtraction and addition is exact, and floats can represent integers with exactness up to a certain point. A single precision float can represent integers up till 2^24 with exactness, that is 16,777,216, more than 16 million. A 64 bit float ('double') can represent integers up till 2^53, that is 9,007,199,254,740,992 (more than you'll need in dsp). By the way, many fractions can be represented with exactness in both decimal and binary floating point format. This includes values in the form 1/2^n (1/2, 1/4, 1/8 etc.). Katja

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pd-extended on Windows7 64 bit
by Pagano, Patrick 11 Dec '11

11 Dec '11

May I ask what the state of pure data extended on 64 bit windows7 is? Does Gem Work properly? Is there a version specifically compiled for 64 bit? Thanks pp

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pd at startup creates 2 canvases, why?
by Ivica Ico Bukvic 11 Dec '11

11 Dec '11

I guess this is primarily for devs: The title says it all. When pd starts up, it does 2 instances of canvas_new() calls. More interestingly, it does not do canvas_free for those two instances when closing pd, suggesting this is a memory leak. So, what gives? Why does it create 2 invisible canvases, what is their function, and how do they differentiate from the regular canvases. NB: Not sure if this makes any difference but this is pd-l2ork code based on pd-extended...

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Detecting audio drop outs inside a patch
by Roman Haefeli 11 Dec '11

11 Dec '11

Hi all Is there a way to detect DSP drop outs in a patch, respectively to get the information that is displayed in the Pd main window? The idea is to create a [metro]-like abstraction that runs in sync on several hosts. The first problem is getting them in sync, which can be done with a NTP-like protocol. The second problem is keeping them in sync, respectively detecting when an instance loses sync and this is where I am not quite sure how to solve this. One reason for a [metro] to fall behind is an audio drop out. As the information about drop outs is already known to Pd, I would like to know if it is possible to get it into a patch. I thought about measuring the [metro] output with [realtime] in order to detect drop outs. But then I think the maximal allowed deviation without causing a drop out is dependent on the current audio buffer setting and thus this method seems not reliable for detecting drop-outs. BTW: I know about [netro] written by Chris McCormick, but it covers a different use case. It's designed for a setup where all hosts are in the same local network thus it doesn't take network latency into account. Roman

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Nerdy Phase Vocoder question or remark
by Alexandre Torres Porres 11 Dec '11

11 Dec '11

Hi there. I've been opening the guts of the phase vocoder patches for a while now, and rewriting them, having it in new forms, etc... And... today I had this doubr. You see, lets have the regular I07 example. Now, we feed [line~] objects with where to start and where to go in a time specified as the FFT analysis Hop size in ms. I was wondering if that wasn't just too fast. And why wasn't the time for [line~] the actual window size in ms. That is because I assumed this [line~] controlled somehow the speed playback we hear. So I put a number box and started messing around with it, making it a bigger time lenght and hoped to listen to some sound change (maybe speed), just for fun. To my surprise, nothing happened!!! That is until I reached two overlaps (1024 points instead of 512). So instead of making anything clearer than it was, it got pretty much more weird. I decreased the values until reaching a supidly small time inteval of micro ms, something like 2.26e-07, and it still worked!!! I now have the clear idea that this length in ms is not that important at all. But that it has to be fast just to make line output the audio so it gets in the FFT. If it takes to long (2 overlaps or longer) it ruins everything. But what really controls the thing is the time interval defined by the counter which is controlled by the speed parameter. [line~] needs to feed the [tabread4~] output at a rather free way. Anyway, some nerdy remark. I'd like to understand this better, and explain this better in my rewriting of the patches. Thanks Alex

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pvoc~ / classic vocoder
by Alexandre Torres Porres 10 Dec '11

10 Dec '11

Hi, I've seen around this listed in a few pages as a pd object pvoc~ an additive synthesis phase vocoder is it out there somewhere for real? cant find it. Oh, by the way. is there some Classic old school frequency band vocoder implemented as a Pd patch somewhere around? I dont mean miller's "timbre stamp" example, or a few objects I've seen, or the bark spectrum phase vocoder from timbreID. Got it? --------- By the way, I'm preparing a new update on my tutorials I've been using on FFT workshops. Will put them out here soon. They started off in portuguese, but I've been converting them to english. Oh, and here's something ironic; this is a very cool Phase Vocoder tutorial as I pointed out http://cycling74.com/2006/11/02/the-phase-vocoder-–-part-i/ . It shows how to do it in polar and cartesian form, but I never tested their patches. So I got curious and downloaded max 6 demo to try them. The cartesian form actually doesn't seem to work well at all! And it is totally based on Miller's I07 example patch. Anyway, I did a polar version of the phase vocoder with [cartopol~] / [poltocar~] objetcs. It does look much simpler and easier to understand. So, I will put them out soon. Thanks

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Transmittance #2 - telepresence online performance
by Luka Prinčič // Nova deViator 10 Dec '11

10 Dec '11

hi all, just wanted to announce a live performance. In this project we use primarily linux and GNU GPL software (Pure Data, GEM, SuperCollider, Icecast, Ogg/Theora video) and hardware (SenseStage). Appologies for any cross posting. Transmittance #2 - telepresence performance =========================================== @ http://transmittance.si & @ Tobacco 001 Cultural Centre, Ljubljana // 13. december 2011 @ 20:00 CET // Online audience can watch and interact with the performance live using a recent version of popular browser like Firefox or Chrome. No other software is needed. Transmittance explores collaboration which is local, global, networked and broadcasted. It involves an artistic group of performers, visual artists, musicians and computer programmers to research performative possibilities of streaming, broadcasting and telepresence forging new types of performance and audience. With focus on critical and socially-aware artistic languages this work is based on asking questions about body, self and society - opening non-dualistic perspectives. The project tries to rethink the notions of spectatorship and spectacle, ways of watching and seeing and the audience as spectators from the outside. In framework of free telepresence technologies it is a quest to open new spaces of visibility for performance and new media art and while critically deconstruct also actively bypass power structures that have a hold on physical spaces of artistic representation. Emphasis is made on creative use of free and open source software and its impact on artistic process and collaboration. The project develops a specific method of improvised performance which allows compositional freedom beside specific prepared scenes at the same time and in the process collide different specifics of various artistic media (performance art, expanded cinema, sound art, new media realities). Transmittance is a project proposed by Maja Delak & Luka Prinčič. Transmittance_#2 is in collaboration with: Loup Abramovici, Boštjan Božič, Maja Delak, Matija Ferlin, Jakob Leben, Ana Pečar, Luka Prinčič, Maja Šorli, Igor Štromajer, Jelena Ždrale and Nataša Živković Produced by: Emanat Institute, Ljubljana Coproduced by: Galerija Kapelica (Zavod K6/4), Tobacco 001 Cultural Center (MGML), Ljubljana Financial support: Ministry for culture of Slovenia, City of Ljubljana //////////////////////////////////////////////////////////////////////// Previous Transmittance phases: Transmittance #1.5, Ljubljana/Graz [26/8 2011] with Maja Delak, Luka Prinčič, ESC Gallery, Graz, Reni Hofmueler and "mur.sat" project // organized by Emanat Institute, ESC Gallery Graz Transmittance #1 Pula,.hr [27/5 2011] with Marko Bolković, Maja Delak, Matija Ferlin, Luka Prinčič, Messmatik, Rea Korani, Mauricio Ferlin, Marcel Mars/Nenad Romič // executive production by: Egle Vošten // produced and organized by: Polis Jadran Europa Pula, Emanat Institute Ljubljana // financially supported by: Ministry of Culture Croatia, Municipality of Pula, Ministry of Culture RS, City Municipality of Ljubljana // supported by: Region of Istria, Tourism Office Pula Transmittance #0, Teatro Petrella, Longiano, Italy [19/12 2010] Maja Delak & Luka Prinčič (Wanda & Nova deViator) // preparation of the tools / open rehearsal // with Adele Cacciagrano, Tihana Maravic, Silvia Mei, Fabrizio Zanuccoli // program VIA DEL CONFINE, The East Side (of the moon) // curator: Nhandan Chirco // organized by: YANVII, Rad'Art Project/Artéco, Teatro Petrella, Emanat Institute Dirty Dozen BodyLab, Berlin, Ljubljana [28/8 2010] Luka Prinčič & Maja Delak - research of streamed interactive performance by invitation of Kathleen Reynolds (Berlin team: Michel Abdoul / Pascal Baes / Joao Costa / Awatef Fettar / Oscar Garcia / Dusan Pejcic / Kiril Bikov / Kathleen Reynolds / Aï Suzsuki / Gill Viandier / Raphaël Vincent / Vero Mota) //////////////////////////////////////////////////////////////////////// http://transmittance.si || http://emanat.si http://wndv.si || http://skylined.org

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pd~ for max
by Alexandre Torres Porres 10 Dec '11

10 Dec '11

Hi there, where can I find the max version of pd~? couldn't find it... i'm curious if or how max users could use my patches in there. Thanks alex

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PD PIET PLUGIN PLEASE
by Pagano, Patrick 09 Dec '11

09 Dec '11

http://www.dangermouse.net/esoteric/piet/tools.html someone should make a pd version :)

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prevent PD of destroying speakers
by haell muth 09 Dec '11

09 Dec '11

hi list! for a pjroject i am currently collecting some extrem sounds made with PD. facing the extremness of this sounds, i am afraid of blowing up my external speakers. so: how can i make my pd-patch not a speaker-destroyer? what is the stuff i have to be carefull about? -thx, haell

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Pd-list December 2011