Pd-list March 2007

pd-list@lists.iem.at

139 participants
278 discussions

no clear buffer in -buffer2-
by Andres Ferrari 29 Mar '07

29 Mar '07

hello, is posible simulate a single buffering using buffer2???...no clear buffer, keeping the last frame created...using openGL in GEM. with message buffer1 is easy....but i want combine scenes with clear and no clear buffer in the same gem window. thanks a lot.!!! AndrÃ©s Ferrari G. http://puredata.org/Members/anfex __________________________________________________ Correo Yahoo! Espacio para todos tus mensajes, antivirus y antispam Â¡gratis! RegÃstrate ya - http://correo.espanol.yahoo.com/

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Self organising map external?
by Jeannette Bohg 29 Mar '07

29 Mar '07

Hello, does anyone know if there is by any chance an external to train/model/use a self-organising map within PD? Best, Jeannette.

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WII remote
by Jiri Heitlager | dadata.org 29 Mar '07

29 Mar '07

I would like to use the Wiiremote and I found the wiiremote object on this list, but because I dont have the developertools installed (and considaring my very limited knowledge about UNIX systems i think it is better that way) I cant compile the files. Is there someway I could have acces to the [wiiremote] . Could I request it to be included in the next release of Pd-extended releases, or is that not possible? Jiri

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two pd/GEM instances - one gemwin
by rainer _ 29 Mar '07

29 Mar '07

Hi, to get some benefit out of my dual core, I have tried to adapt one of my GEM patches to run on two pd instances, connected with netsend/receive. Well, it worked somehow but only with two gemwins... Is it possible to get the whole thing into one gemwin on winXP ?? thanks, Rainer _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

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Cymatics/Chladni figures simulation
by Carl Knott 29 Mar '07

29 Mar '07

I'd like to write a simulation of a Cymatic Tonoscope. I plan to create a physical model of a circular membrane, sand will be sprinkled on top of it. When a person speaks into a microphone the membrane will vibrate causing the sand to form standing wave patterns. Obviously this will be done in real time. Any ideas guys? I really want to write this :) All the best, Carl.

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Re: [PD] attack/release for spectral gate [was: is this a spectral gate?]
by Kevin McCoy 29 Mar '07

29 Mar '07

Hi Chuck! Actually I was working on it tonight. The problem with it is that it is too harsh and leaves too many artifacts on the signal right now because the binary [>~] from zexy needs to be smoothed out with attack/release that persists across different blocks in time. What I tried tonight was successive delay lines where the block starts out at 0.25 of its original amplitude, then passes to another delay and is amplified to 0.5, then to 1, held at 1, down to 0.5, and then to 0.25 and back off. Successive delay lines that increase and then decrease were the only way I could think to do this job of smoothing it out over time and preserve information from past blocks of audio. I've attached the patch as I was working on it tonight. However, this has some problems of its own and I was getting a lot of high frequencies that I didn't want there, so I think this approach will need to be windowed as well - the delay lines may need to be smoothed too, something along the lines of the pitch shifting example in the documentation, except in the frequency domain?? I dunno and I'm in a little bit over my head at this point. It's hard to measure and assess what you do right and wrong in the frequency domain! Sometimes a brother just needs a scope. I am also open to fact that I am completely wrong about this :) What you're describing, if I read you correctly, is I think implemented in the noisegate example in Pd's doc... if they are different, could you clarify? but all of these just sound bad to me and of poor quality, they really need attack and release to sound convincing/interesting and less "artifact-y" when you really push them. I'm all for destruction/mangling of audio, and FFT seems truly powerful in that regard, but I just don't like these results yet. Of course, Tom Erbe's soundhack filters already do this, but he hasn't responded to this on how he got attack/release to work for him - it may need to be handled differently in Pd as opposed to whatever he used to code those VSTs. That said, I would *love* to hear/try what you come up with. Let's be in touch about this! Kevin On 3/28/07, Charles Henry <czhenry(a)gmail.com> wrote: > Hi, Kevin, > I liked your idea for a spectral gate. I can see two possible > applications for it: > 1. removing broadband noise from signals > 2. masking out one sound from a collection of sounds > > And the first option is especially cool. It would be like a noise > gate on steroids, because it would remove the noise, even when there's > a signal present. If it's alright... I'd like to give it a try, and > send it to you. > I'll re-format it so that one signal (noise or whatever) can be > recorded and then used to mask the same signals out of a continuous > signal input. In fact this can be reformatted as a kind of weiner > filter, which will optimally reconstruct signals in the presence of > noise. > Have you gotten this working the way you want yet? > > Chuck > > On 3/23/07, Kevin McCoy <km.takewithyou(a)gmail.com> wrote: > > Hello all, > > > > A while ago I was working on a spectral gate patch and now I've come > > back to it. Here's a quote from Tom Erbe's earlier email: > > > > "For a spectral gate, just calculate the amplitude from real and imag, > > make your gate decision based on the amplitude and threshold, and > > then apply the same gain reduction to both real and imag. Add attack > > and release to the gate-gain for smoother results." > > > > I want to add the attack and release so it sounds smoother and less > > bubbly/harsh (know what I mean?) I am racking my brain trying to > > figure out how to do this to each of the frequencies. The soundhack > > vst does this really nicely and even has a visual representation of > > the gate where you can see it rise and fall with attack/release for > > the whole spectrum. > > > > The problem for me is persistence across different blocks. I suspect > > [line~] doesn't work for this as it does for amplitude attack/release > > implementations. For example, if there is a spike around 3000 Hz, how > > can I carry that attack and release across several blocks of audio? I > > used delay objects with what I thought was some success, but I don't > > think I had it right. I have attached the patch which is basically > > what Frank posted earlier - it does not have any of this yet and is > > just a hard on/off. > > > > Much confusion, I would be grateful for any help! > > Kevin > > -- > > > > > > ++++ > > http://pocketkm.blogspot.com > > > > _______________________________________________ > > PD-list(a)iem.at mailing list > > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list > > > > > > > -- ++++ http://pocketkm.blogspot.com

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text3d and general pd compiling problems on OSX tiger
by marius schebella 29 Mar '07

29 Mar '07

Hi, has someone managed to get text3d working on osx tiger? Now I am using pd-extended-0.39-2 and Gem has been compiled without font support. so I tried to compile my own pd-extended, but did not succeed. /usr/bin/libtool: internal link edit command failed make[2]: *** [../bin/libPdTcl.dylib] Error 1 make[1]: *** [pd_install] Error 2 make: *** [darwin_app_core] Error 2 so I tried to compile everything from scratch and started with pd0.40, when I want to open it, I get a tcltk error... SetFrontProcess failed,-606 needless to say that this is all frustrating. I would suggest to spend some money of the summer of code grant on making the existing versions more user friendly. otoh, what do I have to do to get text3d running? marius.

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[sqosc~]-issues
by Roman Haefeli 29 Mar '07

29 Mar '07

hello martin peach i tested your external a bit more deep on the 'good' soundcard, where i can exclude aliasing introduced by the soundcard. it turned out, that a bit of aliasing is audible in the range above 5000Hz. i think this is not tooo bad, maybe for 'pure'ists. but i had serious troubles, when loading some patches, that contain [sqosc~]. it can happen, that after loading the patch, pd is sending constantly a dc to my soundcard. even when i close pd, the dc stays on these channels, where pd was connected before over jack. to get rid of the dc, i must restart jackd again. because of that, i assume it is related to jackd (is it possible to crash jackd from pd?). i attached a test-patch. when loading that patch, jackd (and pd) get unusable for sure. my system: ubuntu dapper i386 pd-0.40.2 jackd 0.100.0 when i create a patch from scratch with [sqosc~], i have no troubles. i get the dc also, when i open the help-patch of [sqosc~]. roman ___________________________________________________________ Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de

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Re: [PD] Real-time frequency filtering and analysis
by Jaime Oliver 29 Mar '07

29 Mar '07

you could also check sigmund~ it will give you a list of frequencies and amplitudes in order of amplitude. J > > I think this just reinforces what everyone is saying > about the errors. Either you make it into a crazy > competition to vote by banging your note the loudest > and the mostest, or you accept a margin of error. > As Jamie says the intensity and frequencies are all > going to vary and interact. > > attached patch intented to investigate that, it makes > little clusters of 10 votes (idealised sinewave "xylophone") > separated in time by a value between 0 and 100ms at > one of 3 frequencies chosen at random. > What you wont get in reality is the notes being exactly > the same frequency, there should be a fair degree > of variance. When I used a focused noise source to > approximate the xylophones inharmonic spectrum > I couldn't see any correlation above chance. YMMV, > especially if you tweak the windows/blocks . > > I got better initial results with the filter bank approach > I think. > > > > > > On Wed, 28 Mar 2007 09:16:23 -0500 > "Charles Henry" <czhenry(a)gmail.com> wrote: > > > filtering in general may not be the best approach because some of your > > partials from one xylophone note will overlap with other note's > > partials. They are inharmonic complex tones, which are not so easy to > > predict.... you'll probably have to measure the frequencies of each > > note of your xylophone to know exactly what the spectrum is like. > > > > In terms of averaging like Jamie suggested... suppose you want to > > compute the expectation of the power spectral density. You would take > > the fft of the auto-covariance of your recieved signal, divided by the > > number of blocks in your time frame. (dividing by a number of blocks > > will not in general be necessary, when all you need to do is find a > > peak, with pique~ as before) > > This will give you a very clear/accurate peak, without much > > jitter/noise to clean up. > > > > Chuck > > > > _______________________________________________ > > PD-list(a)iem.at mailing list > > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list >

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Real-time frequency filtering and analysis
by Jared 28 Mar '07

28 Mar '07

Summary: I'm interested in capturing audio through a microphone and, in real time, determining which frequency range (from a set range of frequencies) has the maximum level. This would be used to determine which note is loudest out three notes. More info: Hello! I was hoping to get some direction for a project I'm working on. I'm also searching the mailing list archives, but I apologize in advance if I ask questions that have been answered elsewhere. If you think my question has already been answered, I would appreciate any advice on how to better search the archives to find what I'm looking for. I am creating a staged adaptation of a 'Choose Your Own Adventure' novel. For more information, check out the Wikipedia article at http://en.wikipedia.org/wiki/Choose_your_own_adventure The important thing to know is there will be a branching storyline, decided by audience voting. For the voting, I plan for everyone in the audience to have a small xylophone with 3. Each note will correspond to a voting choice presented by the cast. I'm going to have microphones positioned around the theatre to capture the xylophones and pipe them to a computer. What I'd then like to do through PD is determine which note was 'loudest,' meaning the most people cast it for their vote. The voting choices will be displayed by a projector connected to the computer running PD. Thus, I'm interested in either piping the level information to another program (PowerPoint or something else) to display which vote won. I'd also be interested in doing this directly through PD, if it's possible. I'm working my way through the PD tutorials included in the program itself, but would appreciate any advice or suggestions on keywords I can use to search the archives. Please let me know if there is any information I can add to make things more clear. Thanks in advance for all your help. -Jared

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Pd-list March 2007