Pd-list September 2006

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139 participants
230 discussions

Re: [pd] FFT sine to saw oscilator (was:[pd] hanning window + fft)
by Chuckk Hubbard 08 Sep '06

08 Sep '06

On 9/7/06, Charles Henry <czhenry(a)gmail.com> wrote: > On 9/5/06, Chuckk Hubbard <badmuthahubbard(a)gmail.com> wrote: > > Just a thought... the output of a recursive filter from an input of an > > impulse would be several impulses of linearly changing amplitude at > > equally spaced intervals, and it would seem like that ought to give > > some sort of sawtooth if you put it through IFFT. > > I tried to do this, like you said, but couldn't figure it out. > I tried to use z~ with a throw~ and catch~ on very small blocksizes, > but I couldn't get the throw/catch to work. same with send~/recieve~ > > then, I ran the output to ifft~ on overlapping blocks and windowed > with the hanning window > > Let me know if you get it working > > Chuck I was thinking something like this. I was wrong, it's exponential decay, not linear, so it wouldn't create a sawtooth exactly. I also can't for the life of me figure out why the impulse response moves every time I hit bang on here. It seems like it should always start right at the left side of the graph, but sometimes it doesn't show up, and other times it skips around in the graph. But if you set coefficients for the filter, bang until something shows in the response, and set the volume, it does make a harmonic sound. -Chuckk

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Make a grid for choosing videos. How
by Javier García 08 Sep '06

08 Sep '06

Hii How can I create i grid to choose (trigger) videos? Im working with GEM and mac.

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pix_freeframe
by Max Neupert 08 Sep '06

08 Sep '06

hi list, is the [pix_freeframe] working only with .frf files? on the freeframe.org site the majority of filters are there as .dll files. anyone working with those freeframe plugins? the site looks a bit out of date. is this a dead project? thanks, m.

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Operative systems and puredata
by Javier García 08 Sep '06

08 Sep '06

Hi list, a week ago, a user of this list gave this link, http://artefacte.org/pd/ to have a grid for triggering videos in our pd patches. The problem about it (at least for me) is it works only with Linux. Is there any way to make ALL "things" for puredata to run them always indepently of the platform? If yes? Why some people do it that way?

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Re: [PD] launching PD from python (again)
by altern 08 Sep '06

08 Sep '06

Frank Barknecht escribiÃ³: > Hallo, > altern hat gesagt: // altern wrote: >> oh ... i did not get this before. Sorry. I was confused with all the >> range of spawn* offer ... > > Me neither. ;) yes i think i have read like thousand times the Python help files about spawn* and that last paragraph never went into my head. > I just wonder: Wouldn't "os.system" work as well? It's what I normally > use to start processes from Python, but I'm on Linux... os.system(' "C:\\Program Files\\pd\\bin\\pd.exe" -nogui mypatch.pd ') it does work, but as far as i understand pd and python cannot run on parallel with this system, pd has to quit for python to get control again and keep running. At least this happened in my tests but i dont know much about system commands and stuff like that, so there might be a way. cheers enrike

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launching PD from python (again)
by altern 07 Sep '06

07 Sep '06

hi Few months ago i was asking about how to launch pd from python, at that time i was getting some weird error i couldnt solve. I finally found what was wrong (forgot to pass the path to pd with \\ ) but now i have another issue to solve. Basically i am using this code to load PD and open a patch import os args = '-nogui', 'mypatch.pd' # this is a tupple with the arguments for pd, the last is the file to open os.spawnv(os.P_NOWAIT, 'C:\\Program Files\\pd\\bin\\pd.exe', args) It opens pd and the patch fine. But the -nogui doesnt work. I tried with other flags like -noaudio and this time they do work. I am wondering if this has anything to do with the pd console or something like that. Maybe it doesnt like being launched from python? As a test I explored this other method: os.startfile(run.bat) where the run.bat contains the comand pd -nogui mypatch.pd this works fine running pd as process only, but the console of the .bat stays open and i am trying to avoid any kind of window, i want PD to be invisible. I am testing it on windows XP at the moment but I want to use a crossplatform method, this is another reason to avoid the .bat any one has some ideas about how to get this running as i need? many thanks enrike

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2 new utilities...again
by Andres Ferrari 07 Sep '06

07 Sep '06

hello...now was uploaded the correct .zip file sorry. 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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hanning window + fft
by mami music 07 Sep '06

07 Sep '06

Hi everyone. Im starting to study the fast fourier transform. i´ve seen the patches in the examples that come in PD. I have two quesions: I see and understand what the Hanning window does. But why is ti necesary? and how is it related with the samplerate? thanks

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FFT sine to saw oscilator (was:[pd] hanning window + fft)
by mami music 07 Sep '06

07 Sep '06

Hey guys thanks for the explanation!. goin further in the study of fft and applications, iam designing an oscilator that is capable to go from pure sine tone (fundamental harmonic) to a saw (all harmonics)... 1.I have had trouble finding the amplitudes of the harmonics and relating them to a specific function. 2.Theoretically for it to work propperly i should include infinite harmonics, i am using [; table sinesum $f1 $f2 $f3 $f4... $f12] to generate the 12 harmonics with different amplitudes in an array and then read it with tabosc4~ but i still don get enough saw sound. Is it a game of try/error or have any of you guys done it with a larger amount of harmonics.??? 3. What i wanted in the beginning was to use the object FFT~ but didn´t get along quite well... can anyine pinpoint how to create a list that IFFT~ could interpret as a couple of sinewaves? thankz a lot!!!! 2006/9/4, Kyle Klipowicz <kyleklip(a)gmail.com>: > > This is a good explanation. > > ~Kyle > > On 9/4/06, Chuckk Hubbard <badmuthahubbard(a)gmail.com> wrote: > > > If you did a FFT with a block size larger than an entire audio file, > > as I understand it, you wouldn't need a window. Looping Martin Luther > > King's "I Have a Dream" speech (or the audio from the second season of > > CHIPS, or a recording of penguins in their natural habitat) over and > > over with a 30-minute pause between each round would technically be a > > "periodic function", so analyzing it this way would create an accurate > > representation; unfortunately, you would have exactly one value for > > each frequency, which tells you nothing about the frequency content at > > any point. > > To analyze changing frequency content, you have to take smaller > > blocks. Repeating these to make them "periodic functions" means the > > beginning and end of any one block of sound will run together. If > > this happens to create a continuous function, great, but the chances > > of that happening with every block are pretty low (if a block is 64 > > samples, at 44100 samples per second, and the second season of CHIPS > > is 23 episodes, that's a lot of blocks). > > Windowing the input simply forces that part of the function to be > > continuous, by forcing beginning and end to the same value and > > direction. To prevent the data from that part of the function from > > being completely lost, alternating FFTs can be taken with windows in > > opposite phase. > > > > I don't exactly understand what happens with the result, though. > > Whether the frequency values are averaged, or whether resynthesis is > > done with the same overlapping. I also don't understand > > upsampling/downsampling with the block~ object, but I'm not sure > > that's related. > > > > -Chuckk > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Glad this came up!! > > > Kevin > > > > > > > > > _______________________________________________ > > > PD-list(a)iem.at mailing list > > > UNSUBSCRIBE and account-management -> > > > http://lists.puredata.info/listinfo/pd-list > > > > > > > > > > > > > > > -- > > "Far and away the best prize that life has to offer is the chance to > > work hard at work worth doing." > > -Theodore Roosevelt > > > > _______________________________________________ > > PD-list(a)iem.at mailing list > > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > > > > -- > > http://theradioproject.com > http://perhapsidid.blogspot.com > > (((())))(()()((((((((()())))()(((((((())()()())()))) > (())))))(()))))))))))))(((((((((((()()))))))))((()))) > ))(((((((((((())))())))))))))))))))__________ > _____())))))(((((((((((((()))))))))))_______ > ((((((())))))))))))((((((((000)))oOOOOOO > > _______________________________________________ > PD-list(a)iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list >

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Computer Music & Mathematics
by Steffen 07 Sep '06

07 Sep '06

Hey Pd-List, Fist of all: Im sorry if this is too off-topic, i know it's on the edge. I'm soon gonna write the final paper/thesis, before jumping to the "master" studies of mathematics. I'm not too familiar with the all educational systems in the english speaking world, but it's the part of my studies, that, when finished, gives me what's equal to a master degree in mathematics. To the point: I'm hoping to find a topic that combines "computer music" with mathematics, or maybe more correctly; a mathematical topic on a fitting level, that has (some) relations to computer music (in a broad sense). I'm kind of blank and lack computer music knowledge, hence i ask you lot: got any ideas? Hope you can help. And thanks a grand. Oh, my minor is philosophy if that matters. Best, Steffen

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Pd-list September 2006