Pd-list April 2014

pd-list@lists.iem.at

72 participants
94 discussions

How to read I2C sensors?
by Ingo 28 Apr '14

28 Apr '14

I have been using an arduino with [comport] (pduino) to read out sensors so far and want to use a I2C sensor board for some other sensors soon. Can [comport] connect to the I2C interface or is there another object in Pd-extended that can do that? Thanks! Ingo

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anything pd related happening in NYC from May 19-27?
by Epic Jefferson 28 Apr '14

28 Apr '14

or unrelated? electronic music shows, analog or digital. let's hang out and stuff. Will there be a patching circle in May? -- www.epicjefferson.com

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pitch to voltage
by Simon Iten 27 Apr '14

27 Apr '14

dear list, i have a strange problem with my “sinetosawtooth” patch. it is basically a version of the pitch to voltage conversion used in the old gr300 guitar synths from roland. i cut out all the clutter to make it easier to look at and understand. (cut out the adaptive filtering at the input since i use a sine wave for this example and not a guitar string) here is how it works (or should): -an input signal gets amplified by a large factor and clipped. this squares the input. -the square wave is converted to pulses. -the pulses from the rising of the square wave are used to set and reset an accumulating filter (rpole~) this results in a sawtooth wave that varies in amplitude depending on the frequency of the input. -a sample and hold samples the peak of the sawtooth and holds it until the next peak occurs. this, after a conversion gives us the input frequency. yeah! in the example patch i used the falling edges of the square wave to trigger the sample and hold. this samples the sawtooth amplitude after half the rising. (this is also why i have 22050 in fexpr~ and not 44100) i could not figure out how to sample the peak of the sawtooth, so suggestions here are very welcome. now to the problem: the extracted frequency does not exactly correspond to the input frequency. it is pretty close at low frequencies but gets worse at higher frequencies. the factor is not constant. at even higher frequencies (around 5000 hertz) the reported frequency gets totally out of control. i first thought this is because the samphold~ object is inaccurate. but i then saw that the sawtooth wave from the rpole~ object has no constant amplitude even with the input frequency not changing. so it seems that either rpole~ or change~ is not accurate. or the problem is that i sample in the middle of the rising and not at the top ( as described earlier) attached the sinetosawtooth patch. set your sound card to 44100 or change the 22050 in fexpr~ to half the sampling frequency. i would really appreciate if somebody could have a look at this, thanks, simon

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Re: [PD] UDOO Quad and Generic Guitar to USB link issues
by Carlos Sanchez 27 Apr '14

27 Apr '14

Yes, I have tried changing sample rates and it has not solved the issue. The sound card I am using is basically a copy of the Behringer UCG102 guitar to USB interface : http://www.behringer.com/EN/Products/UCG102.aspx On Fri, Apr 4, 2014 at 8:40 AM, tim vets <timvets(a)gmail.com> wrote: > and what is this 'Generic Guitar to USB' exactly? > > > > 2014-04-04 3:09 GMT+02:00 Carlos Sanchez <csanchez126(a)gmail.com>: > >> Hello PD-list, >> >> I am currently working on my semester project which is a guitar >> multi-effect pedal using the UDOO Quad and PD. I got everything up and >> running on the Linaro Ubutu 12.04 LTS build provided by UDOO and I am >> having strange results with PD. The soundcard I am using works normally >> when I am using Audacity. It plays wav files and can record the guitar >> signal correctly but when it comes to PD, a basic osc object or a table >> read through ALSA produces a strange digital noise, completely ruining the >> audio signal. >> >> I have also tested this setup with a M-Audio Fast Track Pro USB card and >> the playback worked without issues, although I could not get the input >> signal through the adc object for an unknown reason. >> >> Has anyone tried a similar setup for guitar usage? >> >> Thanks! >> >> _______________________________________________ >> Pd-list(a)iem.at mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> >> >

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[PD-announce] LoMus 2014 | Submissions was extended to 02 May 2014
by Thierry Coduys 26 Apr '14

26 Apr '14

Submissions was extended to 02 May 2014 Appel à contribution / Call for participation Désolé en cas d’envois multiples / Sorry for possible crossposting LoMus 2014 À la recherche des logiciels libres pour la création sonore et intermédias Pour sa cinquième édition, LoMus 2014 s’adresse à tous ceux qui développent des logiciels libres musicaux ou qui peuvent contribuer au processus de la création musicale. Un prix sera remis aux logiciels qui font preuve non seulement d’innovation, mais notamment d’inventivité face aux enjeux actuels de la création musicale. Calendrier 31 mars 2014 - Appel à soumissions 02 mai 2014 - Date limite de soumission des logiciels 16 mai 2014 - Notification d'acceptation 23 mai 2014 - Remise du prix lors des JIM 2014 Info : http://concours.afim-asso.org/ JIM 2014 : http://www.musinfo.fr/index.php/presentation-des-jim-2014/ LoMus 2014 In search of open-source software for musical and intermedia creation For its fifth edition, LoMus 2014 invites music and audio open-source software creators to submit original projects that either directly or indirectly contribute to musical creation. A prize will be awarded to open-source sofware that proves to be not only innovatory but also inventive in the present context of music and audio creation. Calendar Mars 31, 2014 - Call for submissions May 02, 2014 - Submission deadline May 16, 2014 - Admission notification May 23, 2014 - JIM Awards Ceremony 2014 Info: http://concours.afim-asso.org/ JIM 2014 : http://www.musinfo.fr/index.php/presentation-des-jim-2014/ _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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Distance Measures among Arrays and Lists
by D G 25 Apr '14

25 Apr '14

Hello members of the list I am very interested in creating a list of objects or abstractions from any PD library (pd-extended or beyond) used to measure the distance between two arrays or two lists. Does any of you know one or some? Thanks a lot for your help!!! D

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Select audio device
by Marcello 23 Apr '14

23 Apr '14

Hi, I would like to launch a pd patch from the command line and select a certain audio device. I will do this on windows, how can I do it? Best, Marcello

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Re: [PD] WG: Inverse bandpass filter
by Robert Esler 23 Apr '14

23 Apr '14

I could be wrong, but I don't think it's quite the same thing. I believe the signal would be out of phase negating many of the effects of the filter. I would recommend using [biquad~] and in pd-extended there is a [notch] object which takes care of the coefficients. This sounds much cleaner and more notch-like to my ear than subtracting the filtered output. There is an explanation in Miller's book if you like unit circle math: http://msp.ucsd.edu/techniques/latest/book-html/node144.html ----------- Message: 4 Date: Tue, 22 Apr 2014 01:59:07 -0300 From: Alexandre Torres Porres <porres(a)gmail.com> Subject: Re: [PD] WG: Inverse bandpass filter To: Ingo <ingo(a)miamiwave.com> Cc: pd-list <pd-list(a)iem.at> Message-ID: <CAEAsFmhD0HanLmv9vutcSQZjkZY69i7wMeBqQ+20S2riWYaakw(a)mail.gmail.com> Content-Type: text/plain; charset="utf-8" isn't it just subtract the audio from the filtered output? I guess you can get inverse freq response just by that cheers 2014-04-18 17:21 GMT-03:00 Ingo <ingo(a)miamiwave.com>: > You could send the original signal in parallel and invert the phase by > multiplying with -1. You might have to delay the original signal in case > that the processed signal gets also delayed by one or more blocks. > > Ingo > > _______________________________________ >> > Von: pd-list-bounces(a)iem.at [mailto:pd-list-bounces@iem.at] Im Auftrag > von >> > AP Vague >> > Gesendet: Freitag, 18. April 2014 18:49 >> > An: pd-list(a)iem.at >> > Betreff: [PD] Inverse bandpass filter >> > >> > Is there a simple way to make [bp~] or [vcf~] have an inverse function? > To >> > filter out, rather than pass a changing frequency value. Is the easiest >> > way to do this with a combination of [lop~] and [hip~]? > > > _______________________________________________ > Pd-list(a)iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list >

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Re: [PD] Console error: 'Out of memory'
by David Schaffer 22 Apr '14

22 Apr '14

http://www.flickr.com/photos/schafferdavid/ https://soundcloud.com/schafferdavid From: schafferdavid(a)hotmail.com To: jack(a)rybn.org Subject: RE: [PD] Console error: 'Out of memory' Date: Tue, 22 Apr 2014 13:13:35 +0000 Hi, I may be wrong, but I think the pictures are loaded into you GPU memory, not the CPU RAM... I solved this problem by batch processing my photos in some external software to reduce their weight. worked fine. D.S http://www.flickr.com/photos/schafferdavid/ https://soundcloud.com/schafferdavid Date: Mon, 21 Apr 2014 21:51:12 +0200 From: jack(a)rybn.org To: oconnc26(a)tcd.ie; pd-list(a)iem.at Subject: Re: [PD] Console error: 'Out of memory' OK. For a slideshow, i will use [pix_buffer] or [pix_multiimage]... My preference is for [pix_buffer]. With [pix_buffer], you also need [pix_buffer_read] to select the image you want to show (see help about these two objects) But, I think, it is a good idea to reduce the resolution of your pictures to fit your [gemwin] resolution... ++ Jack Le 21/04/2014 18:27, Claire O'Connor a écrit : I used pix_image! I haven't tried that, but perhaps that might work. I may just end up cutting down on my images. It is strange though, because my 'sllideshow' is set to loop and when it starts again, the previous images that were already opened, open again even though the 'out of memory, can't allocate memory for an image' error comes up. Thanks, Jack! On 21 April 2014 17:06, Jack <jack(a)rybn.org> wrote: Hello, What is the object you used to load images with Gem ? Have you tried to reduce the resolution of your images (to fit your screen) before to load them ? ++ Jack Le 21/04/2014 17:03, Claire O'Connor a écrit : Hi, I am currently using GEM to create a slideshow of images and videos. However, after a while of loading images, PD stops loading them and the console shows up with this error: 'out of memory! Can't allocate memory for an image.' And then shows the file path of the image that it tried to load saying that the liading of it failed. Any ideas as to how to fix this problem? Thanks! _______________________________________________ Pd-list(a)iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list _______________________________________________ Pd-list(a)iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list _______________________________________________ Pd-list(a)iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

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Re: [PD] Controlling amplitude with readsf~
by David Schaffer 22 Apr '14

22 Apr '14

Hi One option, if you want an automated fade out at the end of your file would be to use two readsf~ objects loading/reading the same file but delayed by the duration of the desired fade. The first reader would send a bang when it's finished reading the file and that bang coud be used to trigger the second reader's fade out. Of course, only the second of these readers would be connected to dac~ Hope I'm making myself clear (!) David http://www.flickr.com/photos/schafferdavid/ https://soundcloud.com/schafferdavid > Date: Tue, 22 Apr 2014 13:49:29 +0200 > From: colet.patrice(a)free.fr > To: pd-list(a)iem.at > Subject: Re: [PD] Controlling amplitude with readsf~ > > fade in and out is quite easy to do with a toggle, a [pack f 1000] for > setting the line time, and [line~] to do the ramp on the [*~] that is > multiplying [readfs~] signal, but for automatic fadeout there is a need > to know the length of the sound file obviously. > > Le 22/04/2014 13:33, Simon Wise a écrit : > > On 22/04/14 21:12, Claire O'Connor wrote: > >> I am still having a bit of trouble. I am using another line object to > >> ramp > >> up the number box to fade in my .wav file but when I go to ramp it back > >> down, it jumps straight to zero. I have also tried to 'reset' the line > >> object but that involves sending a message '0' which makes the > >> amplitude of > >> the .wav file jump down again. Any ideas as to how this issue might be > >> resolved? I have a line of .wav files that I want to fade in and fade > >> out > >> as they each play. > > > > sending a single number [0( will jump straight to that value, > > a pair will ramp so [0 2000( goes from current value to 0 in 2 seconds > > then [1 3000( goes to 1 in 3 seconds ... play around with the help patch. > > > > > > Simon > > > > > > > > _______________________________________________ > > Pd-list(a)iem.at mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > > > _______________________________________________ > Pd-list(a)iem.at mailing list > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

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Pd-list April 2014