Pd-list October 2011

pd-list@lists.iem.at

120 participants
174 discussions

Re: [PD] Analyzing subharmonic frequencies accurately
by Mathieu Bouchard 19 Oct '11

19 Oct '11

Le 2011-10-19 à 06:32:00, Ludwig Maes a écrit : > If the hardware sample rate is lowered, then it should already be filtered by the sound card... But if it isn't hardware ? I think that in most cases, it wouldn't be the same as hardware sample rate... unless that's the only thing you want to be doing with [adc~]. Then I just thought that a [rzero~] tuned to the new Nyquist frequency (half the reduced samplerate) might be more appropriate than a [lop~]. What do you think ? Btw, your reply was off-list. ______________________________________________________________________ | Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC

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help browser resize + guiplugins organization
by Charles Goyard 18 Oct '11

18 Oct '11

Hi list, I'm learning pd (so far the only serious thing I did is a video source selector for live/playback/blackout display cropped in a circle), so I spend a lot of time in the help browser. Today I ended up frustrated by how small is that window. So I modified help_window.tcl to be able to resize it vertically. Then I turned it in a guiplugin. Here's the oh-so-complex code as a guiplugin: # let the user decide the size of the help browser bind HelpBrowser <Map> { wm resizable .help_browser 0 1 pack .help_browser.frame -expand 1 } (Just wondering: why is this window fixed size in the first place ?) Also I had a more general question about these plugins: is/will there be some place to centralize them or should every bugger like me post snippets on the list ? Cheers, -- Charlot

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[PD-announce] Xth Sense at Seoul International Computer Music Festival
by Marco Donnarumma 18 Oct '11

18 Oct '11

Dear Pd'rs, I'll be in Seoul from 20 to 24 October. I'll talk about the Xth Sense hardware/software framework (Pd-based) in occasion of the Korean Electroacoustic-Music Society Conference. The event happens within the 4 days SICMF 2011. Any Pd/FLOSS enthusiast out there in Seoul willing to hook up? Or any cool place I can't miss? http://www.computermusic.or.kr/ http://marcodonnarumma.com/works/xth-sense/ Thanks in advance, cheers, -- Marco Donnarumma Independent New Media and Sonic Arts Practitioner, Performer, Teacher ACE, Sound Design MSc by Research (ongoing) The University of Edinburgh, UK ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Portfolio: http://marcodonnarumma.com Research: http://res.marcodonnarumma.com | http://www.thesaddj.com | http://www.flxer.net Director: http://www.liveperformersmeeting.net _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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PD on iPhone
by Eldad Tsabary 18 Oct '11

18 Oct '11

Hello Does anyone here have experience with getting PD to work on iPhone or Android (using libpd or something else?) Thanks Eldad

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Re: [PD] Pd-list Digest, Vol 79, Issue 76
by Samuel Burt 18 Oct '11

18 Oct '11

Roman, Many thanks. I had never downsampled with [block~] before. Does [block~] not go above 1024? I was able to get bins equal to 1.345 Hz with [block~ 1024 1 0.03125]. Sam > ------------------------------ > > Message: 2 > Date: Tue, 18 Oct 2011 11:20:23 +0200 > From: Roman Haefeli <reduzent(a)gmail.com> > Subject: Re: [PD] Analyzing subharmonic frequencies accurately > To: pd-list(a)iem.at > Message-ID: <1318929623.1618.1.camel@yoyo5> > Content-Type: text/plain; charset="UTF-8" > > Hi Sam > > If you're interested only in the lower frequencies anyway, you can > drastically lower the sample rate in order to save some CPU cycles when > doing the FFT. > > Roman >

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Re: [PD] Pd-list Digest, Vol 79, Issue 74
by Samuel Burt 18 Oct '11

18 Oct '11

Katja, that sounds like a nice approach. With sound file playback, I could just delwrite~ the audio 3 seconds so everything would resync. I'm going to have to go back and look at fft, again. I spent a lot of time figuring out how to use [fft~] a few years ago. I'm not quite clear on how to tell what Hz value each bin is indicating. Wait, is it as simple as sample-rate/block-size=Hz? By the way, if I was starting at the beginning with [fft~] this is the place I would go to start figuring it out: http://www.pd-tutorial.com/english/ch03s08.html Many thanks to Johannes Kreidler for these excellent and thorough guides. It's an excellent place to discover new things, even for experienced users. Sam > > ------------------------------ > > Message: 7 > Date: Mon, 17 Oct 2011 23:43:45 +0200 > From: katja <katjavetter(a)gmail.com> > Subject: Re: [PD] Analyzing subharmonic frequencies accurately > To: pd-list(a)iem.at > Message-ID: > <CAFY0eaozjc=xMoq3h2mJo6XmAhtKz-V1+XfM44ps4s+ZMb=12A(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Hi, > > With fft~ you can go up to a framesize of 2^17, that is around 3 > seconds when assuming 44.1KHz SR. The bin resolution is then ~0.37 Hz > which may be just accurate enough for your purpose (spectral leakage > will always make analysis less precise than the bin resolution > suggests). Notice that the latency of your info will also be 3 seconds > then. > > Katja > > > > On Mon, Oct 17, 2011 at 11:24 PM, Samuel Burt > <composer.samuel.burt(a)gmail.com> wrote: >> A friend of mine asked me if I could make some kind of filter that could provide information about subharmonic frequencies. I wasn't quite sure what he meant, but I thought I'd try a few things to see what I could get. >> >> He mentioned he wanted the following bands 1-3 Hz, 4-6 Hz, 7-9 Hz, 11-14 Hz, and 15-18 Hz. >> >> The first thing I tried was a series of [lop~] and [hip~] filters in the ranges he was wanting. I stacked multiple [lop~]s and [hip~]s, to make really hard limits and then sent the output from each band to vu~ meters. This was unreliable. In fact, a 5 Hz sine wave seemed more likely to show up in the 10 Hz band. I also tried [bp~], [vcf~], and [svf~] with no luck. >> >> I then took a different approach, using [threshhold~] and [timer] to time the distance between zero crossings and output the result. This is very reliable for a sine wave, but I fear it wouldn't be that useful for real world signals. >> >> Have any of you ever tried to separate out subharmonic frequencies in Pd? Any experience with brain wave analysis in software? What's a better technique? >> >> Thanks, >> >> Sam in Baltimore >> _______________________________________________ >> Pd-list(a)iem.at mailing list >> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list >> > >

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Hold TWO numbers until bang??
by Sebastian Valenzuela 17 Oct '11

17 Oct '11

Hello, Is there an object that will hold TWO numbers it has received and wait for an incoming "bang" to go ahead and SEND them through its output? Or is there a way to make this work? I would need this to work more than once. For example: *send "0.123 1500" to object*, *send bang which releases "0.123 1500" from its output*, *send 0.445 677" to object*, *bang which releases 0.445 677"*, etc... Thank you for taking the time to read this! Any help is greatly appreciated! -Sebastian

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Re: [PD] Pd-extended 0.43 builds are working again
by Hans-Christoph Steiner 17 Oct '11

17 Oct '11

Welcome to testing nightly builds! It is annoying but it must be done, otherwise we never have stable builds. Thanks for contributing! :-D I think only zexy is not working currently. Its not building right on Windows and Mac OS X 10.5. Everything else should work, let me know if otherwise. .hc On Oct 5, 2011, at 12:37 AM, Joe Newlin wrote: > Hans, > > I was able to get [declare -path] to work after a little trial and > error with path name syntax. > > Now, I'm curious what I need to do to get the externals in zexy (& > maybe other libraries - not sure yet) to work at all. For example, > [date] and [time]. > > It's frustrating, sometimes, being just a guitar player and not a > computer programmer. > > Thanks again, > > -Joe > > On Tue, Oct 4, 2011 at 1:20 PM, Hans-Christoph Steiner > <hans(a)at.or.at> wrote: > > As far as I know, the latency setting in Pd just sets a maximum > buffer size, it doesn't necessarily translate to actual measured > latency. Try a blind test and see if you can tell the difference, > that'll be a much better test. > > As for the search paths, you are much better of not setting them as > global preferences. Instead, use the standard install locations for > installing things globally: > > http://puredata.info/docs/faq/how-do-i-install-externals-and-help- > files > > And for paths needed for patches/projects, use [declare -path]. > > .hc > > On Oct 4, 2011, at 12:35 PM, Joe Newlin wrote: > >> Okay, I installed the latest version. >> >> Good news: Pd-extended and my soundcard are getting along the way >> they used to. this means setting Pd to 14 ms audio latency which is >> not great, but I can live with it. >> >> Bad news: Pd is not saving the search paths that I add. I can't >> remember if earlier versions required clicking a "save these >> settings" kind of thing, but I could find no such option in this >> version and at any rate it's not saving the paths. >> >> Medium news: while I can deal with the 14 ms latency, Pd vanilla >> was working at around 2 ms (unless it was lying to me or obscuring >> something - I only tried it with testtone) but I still can't figure >> out how to get it to load libraries of external dlls. I'm just a >> guitar player and not a computer programmer so I'm a little slow at >> this stuff, but if you have a suggestion for this option I would >> appreciate it. >> >> Thanks for all your work! >> >> Joe >> >> On Tue, Oct 4, 2011 at 8:22 AM, Hans-Christoph Steiner >> <hans(a)at.or.at> wrote: >> >> Lets keep this on the pd-list so that others can participate in the >> discussion :) >> >> I think Martin Peach committed a fix for the pdlua_setup error >> today or last night. >> >> .hc >> >> On Oct 4, 2011, at 11:05 AM, Marc D. Demers wrote: >> >>> Hi .hc, >>> >>> I was able to get the installer on Windows 7. I was able to get >>> rid of all the error message by deleting some line in the «path» >>> and «startup» windows. Mainly, libs that were no more in the pd >>> extra folder. The only error message I get for the moment is >>> concerning the pdlua folder (unable to find the symbol of >>> something like that). I will try to find the bug tonight. >>> >>> Thank's >>> >>> Marc >>> >>> >>> >>> >>> >>> > From: hans(a)at.or.at >>> > To: PD-list(a)iem.at >>> > Date: Mon, 3 Oct 2011 20:57:25 -0400 >>> > Subject: [PD] Pd-extended 0.43 builds are working again >>> >>> > >>> > >>> > Ok, after a long time without a decently working Windows build, >>> I think >>> > we have one that is actually usable. Please give it a try and >>> let me >>> > know. Here's the zip: >>> > >>> > http://autobuild.puredata.info/auto-build/latest/Pd-0.43.1-extended-windows… >>> > >>> > or the installer: >>> > >>> > http://autobuild.puredata.info/auto-build/latest/Pd-0.43.1-extended-windows… >>> > >>> > >>> > .hc >>> > >>> > >>> > _______________________________________________ >>> > Pd-list(a)iem.at mailing list >>> > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list >> >> >> >> ---------------------------------------------------------------------------- >> >> News is what people want to keep hidden and everything else is >> publicity. - Bill Moyers >> >> >> >> _______________________________________________ >> Pd-list(a)iem.at mailing list >> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list >> >> >> >> >> -- >> www.joenewlin.net >> www.twitter.com/joe_newlin >> > > > > ---------------------------------------------------------------------------- > > http://at.or.at/hans/ > > > > > > -- > www.joenewlin.net > www.twitter.com/joe_newlin > ---------------------------------------------------------------------------- Terrorism is not an enemy. It cannot be defeated. It's a tactic. It's about as sensible to say we declare war on night attacks and expect we're going to win that war. We're not going to win the war on terrorism. - retired U.S. Army general, William Odom

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Re: [PD] Simple motion analysis
by Hans-Christoph Steiner 17 Oct '11

17 Oct '11

Sorry, you said simple, so that's a simple start :) For making the distinction between people walking and standing in place, a simple thing would be to bump up the threshold of what counts as movement. Another would be to do multi-blob detection and look for x,y movement in a direction, or that exceeds a certain threshold. Check the 'mapping' library (included in Pd-extended) for an array of techniques of working with the data that will most likely be helpful here. .hc On Oct 17, 2011, at 1:29 PM, Jean-Marie Adrien wrote: > Thanks > I knew the examples obviously ! > Ill try with these objects though. > Making the distinction between on-place-motion and across-frame > motion thus ... in a simple way. > JM > > > > Le 17 oct. 11 à 18:26, Hans-Christoph Steiner a écrit : > >> >> Check the Gem examples, in Pd-extended go to: >> >> Help menu -> Browser -> Gem -> examples 04.video >> >> See: >> >> 06 frame diff >> 07 bg subtract >> 03 movement >> >> .hc >> >> On Oct 17, 2011, at 11:33 AM, Jean-Marie Adrien wrote: >> >>> Hi list >>> >>> Video frame analysis : I would like to be able to make a >>> difference between >>> >>> - motions of poeple passing by (displacements) >>> - motions of poeple standing by somewhere (and slightly moving on >>> place, presence) >>> >>> in a simple way ... >>> anyone got an idea of with what pix_objects to start ? >>> >>> thanks >>> jean-marie >>> >>> >>> >>> _______________________________________________ >>> Pd-list(a)iem.at mailing list >>> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list >> >> >> >> ---------------------------------------------------------------------------- >> >> There is no way to peace, peace is the way. -A.J. Muste >> >> >> > ---------------------------------------------------------------------------- I have the audacity to believe that peoples everywhere can have three meals a day for their bodies, education and culture for their minds, and dignity, equality and freedom for their spirits. - Martin Luther King, Jr.

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Re: [PD] Simple motion analysis
by Jean-Marie Adrien 17 Oct '11

17 Oct '11

Hi Miller yes that's me JM Le 17 oct. 11 à 17:59, Miller Puckette a écrit : > Hi Jean-Marie -- > > Are you the same one I know from IRCAM in the 1980s? > > (I don't know the answer to the question though... don't > use Gem much :) > > Miller > > On Mon, Oct 17, 2011 at 05:33:10PM +0200, Jean-Marie Adrien wrote: >> Hi list >> >> Video frame analysis : I would like to be able to make a difference >> between >> >> - motions of poeple passing by (displacements) >> - motions of poeple standing by somewhere (and slightly moving on >> place, >> presence) >> >> in a simple way ... >> anyone got an idea of with what pix_objects to start ? >> >> thanks >> jean-marie >> >> >> >> _______________________________________________ >> Pd-list(a)iem.at mailing list >> UNSUBSCRIBE and account-management -> http://lists.puredata.info/ >> listinfo/pd-list >

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Pd-list October 2011