Pd-list June 2008

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124 participants
197 discussions

Re: [PD] raw resampling
by Matt Barber 01 Jul '08

01 Jul '08

D'oh! Re-replying with the right subject. =o( On Mon, Jun 30, 2008 at 5:41 PM, Matt Barber <brbrofsvl(a)gmail.com> wrote: > You can see the attached patch if you want linear interpolation and > can stand a little delay. More intricate interpolations (any of the > cubic ones posted in the [tabread4~] thread, e.g.) can be done in this > way at the expense of more processing and longer delay. > > > Matt > > >> Date: Mon, 30 Jun 2008 18:10:46 +0200 >> From: Atte Andr? Jensen <atte.jensen(a)gmail.com> >> Subject: Re: [PD] raw resampling >> To: Claude Heiland-Allen <claudiusmaximus(a)goto10.org> >> Cc: pure data <pd-list(a)iem.at> >> Message-ID: <48690586.7010300(a)gmail.com> >> Content-Type: text/plain; charset=ISO-8859-1; format=flowed >> >> Claude Heiland-Allen wrote: >> >>> in~ [phasor~ 4410] >>> | | >>> [samphold~] >>> | >>> out~ >> >> Ah, of course! >> >>> Note: this doesn't change the sample rate, but resamples the signal at >>> 4410Hz. Not sure if this is what you want, but it's what I use if I want >>> lots of aliasing... >> >> I didn't really expect to have a signal at 4410. Would that have any >> benefits, for instance with regards to performance? >> >> Basically I (like you) just want to hear some alias noise! >> >> -- >> peace, love & harmony >> Atte >> >> http://atte.dk | http://myspace.com/attejensen >> http://anagrammer.dk | http://modlys.dk >

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Re: [PD] Pd-list Digest, Vol 39, Issue 118
by Matt Barber 30 Jun '08

30 Jun '08

You can see the attached patch if you want linear interpolation and can stand a little delay. More intricate interpolations (any of the cubic ones posted in the [tabread4~] thread, e.g.) can be done in this way at the expense of more processing and longer delay. Matt > Date: Mon, 30 Jun 2008 18:10:46 +0200 > From: Atte Andr? Jensen <atte.jensen(a)gmail.com> > Subject: Re: [PD] raw resampling > To: Claude Heiland-Allen <claudiusmaximus(a)goto10.org> > Cc: pure data <pd-list(a)iem.at> > Message-ID: <48690586.7010300(a)gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Claude Heiland-Allen wrote: > >> in~ [phasor~ 4410] >> | | >> [samphold~] >> | >> out~ > > Ah, of course! > >> Note: this doesn't change the sample rate, but resamples the signal at >> 4410Hz. Not sure if this is what you want, but it's what I use if I want >> lots of aliasing... > > I didn't really expect to have a signal at 4410. Would that have any > benefits, for instance with regards to performance? > > Basically I (like you) just want to hear some alias noise! > > -- > peace, love & harmony > Atte > > http://atte.dk | http://myspace.com/attejensen > http://anagrammer.dk | http://modlys.dk

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interpolation benchmarks (WAS: Re: better tabread4~)
by Matt Barber 30 Jun '08

30 Jun '08

Hello, So I thought maybe it would be a good idea to start a thread with ideas for benchmarking the interpolation schemes. This is what comes to mind, but I'm by no means an expert on this, so some may be more relevant than others: 1. Cosine wave measurements -- measure spectrum, RMS of residual error (against which ideally-produced cosine wave?), spectrum of error, etc. Possible to do mathematically rather than in Pd, but Pd would make it easier to test a lot of cases quickly. 2. [noise~] and [vd~] (or a random table and [tabreadx~]); measure bandwidth of various degrees of transposition down and up. It might be worthwhile to test a random table with [taboscx~] and do some spectral measurements (what happens when you make it periodic?). Test with pink noise, gaussian noise, sample-and-hold noise, etc. Triangle waves or a linearly interpolated "low-frequency" noise might be interesting to check as well, just to see how much they distort a straight line. 3. Compare transposition down and up with many different vocal and instrumental samples (ideas?). Test residual differences between schemes two at a time. Please amend the list or add to it. =o) Cool. Matt

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Trax - Sinusoidal Model Synthesis in Pure Data
by Rich E 30 Jun '08

30 Jun '08

www.teafordragons.com/rte/trax.html This is a patch I've been working on for quite some time now, finally packaged with some documentation and an example qlist with it. Trax is a fancy additive synthesizer that stores partials in data structures and re-synthesizes them using [oscbank~]. It gets the sinusoidal models from SDIF files with 1TRC frames, which have to be imported with [sdiflists]. I'd like to know how well it works for others, it makes great sounds on my Ubuntu laptop, although I had much worse results on a Macbook. You can get the externals from cvs or: www.teafordragons.com/rte/software.html I personall control Trax with a Wacom Intuos3, so there are mappings programmed for it that get wacom data using [linuxevent]. *note: I chose not to use [hid] because it is possible to call the wacom with [linuxevent /dev/input/wacom], which is always symbolically linked to the correct /dev/input/event*. I couldn't ever get [hid] to do find the wacom on its own, without specifying exactly which event number it is on. You can also listen to a couple pieces I wrote using Trax, which also use other fun Pd stuff and recorded in Ardour: www.teafordragons.com/rte/music.html Now, on to SMS, Spectral Model Synthesis, that is.. cheers, rich

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HMM library - Chroma Analysys - Midifile dump (was: Midi File Playback)
by Spencer Russell 29 Jun '08

29 Jun '08

On Sat, Jun 28, 2008 at 1:27 PM, <pd-list-request(a)iem.at> wrote: > > On Sat, Jun 28, 2008 at 8:09 AM, Luigi Rensinghoff > <luigi.rensinghoff(a)freenet.de> wrote: >> Seq works fine so far ... but...what about playback speed ?? > I'm working on a score following toolkit using the GHMM library for hidden markov models, and as part of it I wrote a simple object called midiopen that takes a midifile and dumps all the data on its outlet. There's a simple PD patch called midiplay.pd that uses the midiopen object to play back a midifile using vline~ to schedule the whole thing. So far I've just written it for my own use and it's very hacky and I think it chokes on sysex messages, but feel free to check it out. The chmm object is something I'm working on to allow the creation of state machines with probabilistic emissions, and the selection of the most likely state sequence given a system and a sequence of emissions. It doesn't work yet, but it's a fun project. release early, release often, right? Compiling the whole thing requires libfftw3 and libghmm, but you can compile just the midiopen object without them. for those interested, there's also an object called chroma~ in there that takes audio input and each time it receives a bang spits out a 12-element list of how much energy it has received in each of the 12 half steps of western classical music since the last bang. check it out with svn co http://pdhmm.googlecode.com/svn/trunk/ pdhmm to compile on linux just type "scons" to compile on other platforms....I'm not sure.

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Phase Distortion Patch
by Uğur Güney 29 Jun '08

29 Jun '08

# Hi, while I was looking some examples for my chip design class I came across with this site: http://www.fpga.synth.net/pmwiki/pmwiki.php?n=FPGASynth.PhaseDistortionOsci… where it talks about the idea of Phase Distortion Oscillator: http://en.wikipedia.org/wiki/Phase_distortion_synthesis # I made a very simple implementation of it with Pure Data. (Actually PD is very fast for realizing the ideas!) And want to share it. # I am attaching the patch: PhaseDistortion.pd There are two tables with the same length. First table includes the phase values of the sin function, ie. if the n.th point in the first table has the value x_n then n.th point in the second has the value of sin(2*pi*x_n). My patch is not versatile. It has only one parameter for manipulating the first table. You can change it with the slider and see its effects. (There is some aliasing, because I did not used any interpolation for reading from the table) # Have a nice day! -ugur-

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pd-extended 0.40.3 ui performance
by Damian Stewart 29 Jun '08

29 Jun '08

hey folks, the new UI in 0.40-3 extended looks super nice - but on my machine (dual i386 2.0Ghz / MacOsx 10.4) it seriously degrades UI performance, especially with Graph on Parent objects. for example, loading a small GOP abstraction with four bang buttons, two checkboxes, a number box, a slider and a vu meter takes a noticeable amount of time with 0.40.3-extended, but happens instantaneously with 0.40.2-vanilla. dragging this abstraction around the window suffers as well: on 0.40.3-extended when dragging this object the performance drops down to about 10fps, whereas on 0.40.2-vanilla i can drag at what seems to be the full framerate of my system (there's a bit of mouse lag though). it seems such a shame, because it really is much nicer to work with, visually, but the sluggishness when i get sizeable patches going is going to keep me on 0.40.2-vanilla with its old fashiouned ui. i assume the culprit is Tcl/Tk. i ask again: why are we using Tcl/Tk to implement the UI part of a **graphical** dataflow language? Tcl/Tk is a user-interface toolkit, but we're asking it be a graphics platform, and it just can't hack it. -- damian stewart | +31 6 5902 5782 | damian(a)frey.co.nz frey | live art with machines | http://www.frey.co.nz

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Pd-0.40.3-extended-rc3 released
by Hans-Christoph Steiner 29 Jun '08

29 Jun '08

http://at.or.at/hans/pd/installers.html This release candidate includes: - some fixes for [hid] and mapping objectclasses. - a striped down universal binary of Tcl/Tk on Mac OS X to the one cpu type - included config in Info.plist for the Spotlight Importer - other minor bug fixes Changelog - next visual appearance designed for readability - default locations for user-installed externals, helpfiles, etc. GNU/Linux: /usr/local/lib/pd-externals and ~/pd-externals Mac OS X: /Library/Pd and ~/Library/Pd Windows: %ProgramFiles%/Common Files/Pd and %UserProfile%/ Application Data/Pd - lots of standard key bindings added: Enter/Return for OK Escape for Cancel Ctrl/Cmd-W closes all windows on Mac OS X, Cmd-` cycles thru open windows on Mac OS X, Cmd-m minimizes windows Ctrl/Cmd-R raises/lowers Pd window Ctrl/Cmd-Shift-R shrinks/grows Pd window Ctrl/Cmd-Shift-L clears Pd window's text console Ctrl/Cmd-B opens the Help Browser - you can now use "~" in all paths to mean home folder, and on Windows you can use environment variables, lie %UserProfile% in paths - Cut/Copy/Paste now work directly into object and message boxes on all platforms - fixed Cut/Copy/Paste for the Pd window's console - [declare] and [import] now sorted out for loading (but much work needs to be done before there namespace support is complete) - "File -> Save As" defaults to the Home folder (~/) on Mac OSX - new patches default to the folder last saved in - included pgp_opengl aka 3dp on GNU/Linux and Mac OS X - 'hardware' and 'deprecated' removed from libraries loaded by default - On Debian/Ubuntu, the packages now install into /usr rather than / usr/local - On Mac OS X, you can now build "standalone" applications from the File menu. - bug fixes and clean up of [hid] and mapping externals KNOWN BUGS - check http://puredata.info/dev/bugtracker before reporting bugs - Escape, Enter, and Ctrl/Cmd-W don't close the Path and Startup preferences - pdp_opengl is alpha and will definitely crash Pd - loading pdp_opengl will crash Pd if X11 is not open before trying to load it - the GUI runs slower in some situations ------------------------------------------------------------------------ ---- If nature has made any one thing less susceptible than all others of exclusive property, it is the action of the thinking power called an idea, which an individual may exclusively possess as long as he keeps it to himself; but the moment it is divulged, it forces itself into the possession of everyone, and the receiver cannot dispossess himself of it. - Thomas Jefferson

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Re: [PD] getting started with webcam/pdp
by Atte André Jensen 28 Jun '08

28 Jun '08

ydegoyon wrote: > puès, the artefacte page is obsolete > and everything is in svn now, > thus in the latests builds automagically These ones: http://autobuild.puredata.info/auto-build/2008-06-28/? I installed the one for my system (ubuntu gutsy), and unfortunately both problems remain: 1) Pd crashes when using pdp atte@ajstrup:~$ pd /usr/lib/pd/doc/examples/pdp/example01.pd tk scaling is 1.18830409357 <init> : Avifile RELEASE-0.7.47-070916-12:47-4.1.3 <init> : Available CPU flags: fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 tm pbe up bts est tm2 <init> : 1600.00 MHz Intel(R) Pentium(R) M processor 1600MHz detected ----- At this point i clicked the bng ---------- X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 143 (GLX) Minor opcode of failed request: 5 (X_GLXMakeCurrent) Serial number of failed request: 32 Current serial number in output stream: 32 pd_gui: pd process exited atte@ajstrup:~$ 2) GEM shows funny colors (blue skin for example) in /usr/lib/pd/doc/examples/Gem/04.video/00.SimpleVideo.pd This is (now) with http://autobuild.puredata.info/auto-build/2008-06-28/Pd-0.40.3-extended-200… under ubuntu/7.10 on an IBM T41 (PentiumM) laptop with ati graphics card: atte@ajstrup:~$ lspci | grep Rad 01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500] Any help appreciated! -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk

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Midi File Playback
by Luigi Rensinghoff 28 Jun '08

28 Jun '08

Hi List I would like to play back a midi file and i am using "seq" for that. It looks like "xeq" is not under active development any more and thus not a good choice for OSX.. Seq works fine so far ... but...what about playback speed ?? Do i have to send a MIDI - metro message via midiin ?? As another way i tried to use qlist (after having converted the midifile to a textfile, but that seems to be an overcomplicated way) Any suggestions ?? Thanks Luigi >---------------------------------------< Luigi Rensinghoff luigi.rensinghoff(a)freenet.de skype:gigischinke ichat:gigicarlo

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Pd-list June 2008