Pd-list July 2014

pd-list@lists.iem.at

35 participants
83 discussions

bp coefficient calculation test
by Alexandre Torres Porres 22 Jul '14

22 Jul '14

Hi there, as I've been saying here, I've been studying about filters and trying to emulate some of the filters as raw filters, or in biquad coefficients. I thought I had nailed [bp~], but now it seems there's some minor discrepancy between the original object and my patch implementation. Check the test patch I made: https://docs.google.com/file/d/0B3AoiT0xk8fnWmhuYWtPdk9UYUU/edit I'm analysing a filtered noise with [env~] and the resulting numbers should match exactly in order to prove I've done it right, but a small difference in value insists on showing up. Would any of you be interested in checking it up? Maybe you can find some mistake that could be corrected and then match the numbers perfectly, or maybe you could tell me why there's such a small difference and it'll always be there... I don't know. I have the full code in the patch for you to check it out. All I know is that I've done the same thing with lop~ and numbers match beautifully By the way, [vcf~] is next on my list Thanks! cheers

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Externals for accessing BeagleBoneBlack's GPIOs and Analog inputs.
by Rafael Vega 21 Jul '14

21 Jul '14

Hi, I made a couple of externals to access analog and digital pins in the BeagleBone Black from PD patches. Find it here: https://github.com/rvega/pd-bbb-gpio -- Rafael Vega email.rafa(a)gmail.com

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[PD-announce] yahoo rejecting pd-posts
by IEM - network operating center (IOhannes m zmoelnig) 21 Jul '14

21 Jul '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 dear Pd junkies, recently, yahoo (and later aol) has implemented a strict spam-preventing scheme, that basically prevents mailinglists like yours truly from doing their work [1]. this scheme basically disallows re-distribution of emails from people with yahoo-accounts. you (esp. if you are using yahoo yourself, but gmail users might be affected as well) might have noticed, that some mailing-list posts have gone missing (esp. when originating from other yahoo users). a possibly missing email can be found at [2]. this is *not* a hostile attempt from our side (your faithful iem-team) to censor the mailinglist(s). we are currently investigating ways to mitigate the problem [3], but haven't found an acceptable /and/ working technical solution yet. if possible, we would like to suggest all posters using yahoo-addresses, to consider switching to another (free)mail-provider - - if only for the purpose of posting emails to innocent mailinglists. if we do not find a solution fast, we might be forced to *temporarily* disable posting from yahoo-addresses (but will try avoid this step as long as possible, and if forced to use it keep it as short as possible). yours, fgasmdr IOhannes [1] http://thehackernews.com/2014/04/yahoos-new-dmarc-policy-destroys-every.html [2 http://lists.puredata.info/pipermail/pd-list/2014-05/106991.html [3] http://wiki.list.org/pages/viewpage.action?pageId=17891458 - -- IEM - network operation center mailto:noc@iem.at -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Icedove - http://www.enigmail.net/ iQIcBAEBCAAGBQJThIvKAAoJELZQGcR/ejb4N3gP/0fcSMAI6IreSxcDlqWnL8h0 iNXIf0hMZGSNf6hcSN4zfgzNoUFtPV+f6HEcIXdYK6OR8Yymwgi31orunX6YWl1a xQYxgYsQ2L7a/JTvZSkgO2/HPtuGT83fzf9P43eJlSt47wVRloEphOe0tts4iObU NGsFHk/FUXfzGvmQA3RRFUFu+6GVsDA27EdHuJybBiMfbfL9WEqIcps9fvMF3ck5 ujw9SnnLKWqGVp2qImU4CW8DvbJr9WNzHQKNv/qAqYSYJepI7bqDUZuTR/+gjHzF PYKuu1g8+vRwemGkZJ9g+YSrt7cpG6xS8MOIFRmzNcjckh4BdRNtRqT0gEfpLjEd Qy7aYHpBbZVRDCJPIGPFhKScvKHjWEyNs5DWQ1EyVqt7240wnVQCC6KtIKtEOs1F E6LS62p3pg9dwT67fqEaMVU6VPN5/UFAm0478paICL73PwT2YcYDh6mf7Rri9io4 2XAFIi1QRqv4Arn87x323dn8ihXQN2hz2PZQkY9DXlN6CEMt8AOZe7oVmnWWrMEt 6rvj9vKnjT6Odj+cd0Ny/OWGq3nMP9ARLzQyoFtJzheM3ASvROGGqT+RJuHKLiBM hZ2p0Q6dbQeLsx37f7xdNhlK0CQgUjwJjD6kggLcCXpu5IFehZniwmvIyTok6QB+ qrWUMA2lNFl8GeVHBiDr =JzQK -----END PGP SIGNATURE----- _______________________________________________ Pd-announce mailing list Pd-announce(a)lists.iem.at http://lists.puredata.info/listinfo/pd-announce

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Re: [PD] metro drift
by Nicola Pandini via Pd-list 20 Jul '14

20 Jul '14

> On Mit, 2014-07-16 at 14:08 +0200, Nicola Pandini via Pd-list wrote: >> Hi, >> I made a patch that uses metro to keep the sync between sequencers and >> other instances of the patch. I also use this patch to start, stop and >> set the tempo of SooperLooper. I only use this patch to do MIDI stuffs >> (with options -noaudio -alsamidi) >> Sometimes, when the metro is running and I open a patch full of canvas >> and nbx, the metro freezes for a couple of seconds, and so Pure Data and >> SooperLooper lose the sync. >> Is there a way to avoid this? > There is probably a way to circumvent the problem. Different audio > backends behave differently. I can't tell anything about Windows or Mac > OS X, but on Linux you could use ALSA as the audio backend in order to > keep Pd in sync with real time. This won't help avoid xruns, of course, > but when xruns occur, Pd will catch up (assumingly by just skipping a > few blocks) until it is in sync with real time again. > > The situation with JACK is different. When an xrun occurs, Pd freezes > until the blocking operation is finished and then Pd is behind real > time. I don't know about CoreAudio, MMIO or ASIO. Probably one of them > behaves similar to ALSA? > >> Will it be more stable if I start PD with -nogui and then PD -guiport 0? > I don't understand what you're trying to achieve with that, but it seems > to me it won't help. The key word here really is 'blocking operations'. > Try to avoid them. Do not load large patches, don't load soundfiles, > don't do any [1000000(-[until] stuff. > > Roman Thank you Roman, I'll try to use alsa as audio backend. -- Nicola

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Re: [PD] readanysf~ on mac OS X
by Oskoff via Pd-list 19 Jul '14

19 Jul '14

thanks Nicolas!! 2014-07-17 9:34 GMT+02:00 via Pd-list <pd-list(a)lists.iem.at>: > Send Pd-list mailing list submissions to > pd-list(a)lists.iem.at > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.puredata.info/listinfo/pd-list > or, via email, send a message with subject or body 'help' to > pd-list-request(a)lists.iem.at > > You can reach the person managing the list at > pd-list-owner(a)lists.iem.at > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Pd-list digest..." > > > Today's Topics: > > 1. Re: Jonathan Wilkes via Pd-list <pd-list(a)lists.iem.at> > (Simon Wise via Pd-list) > 2. Re: Jonathan Wilkes via Pd-list <pd-list(a)lists.iem.at> > (Jonathan Wilkes via Pd-list) > 3. Re: Jonathan Wilkes via Pd-list <pd-list(a)lists.iem.at> > (Simon Wise via Pd-list) > 4. Re: readanysf~ on mac OS X (Nicolas Montgermont via Pd-list) > 5. Re: readanysf~ on mac OS X (Roman Haefeli via Pd-list) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 17 Jul 2014 13:49:26 +1000 > From: Simon Wise via Pd-list <pd-list(a)lists.iem.at> > To: pd-list(a)lists.iem.at > Subject: Re: [PD] Jonathan Wilkes via Pd-list <pd-list(a)lists.iem.at> > Message-ID: <53C747C6.8060401(a)gmail.com> > Content-Type: text/plain; charset=UTF-8; format=flowed > > On 16/07/14 02:52, Ivica Bukvic via Pd-list wrote: > > Depends what you mean by decent enough. Original Pi has audio out. Is it > > decent enough, depends on your needs. That said, RPi (regardless of the > > revision) is a formidable arduino replacement. See lots of pots shield > that > > fits either (I just presented a paper on it in NIME) made by modern > device. > > Couple that with an $9 USB audio card that has both input and output and > > you're done. > > or lash out on a $35 wolfson card if you need stereo in and out plus more, > and > want to avoid the usb. > > certainly the Raspberries are cheaper than the Udoo, even with this card > included ... but 3+ x the price of a Raspberry does get you a lot more > computing > power (4 much faster CPU cores plus an Arduino Due core with all the > analogue > and digital IO exposed and internally connected ... and the GPUs have > openCL > available and much more comprehensive documentation if you want to use > them at a > very raw level). There are much better peripherals included if you need > that. > Not sure yet how the audio noise compares between the wolfson, plain > raspberry > and udoo but will test and report eventually > > > Simon. > > > > ------------------------------ > > Message: 2 > Date: Thu, 17 Jul 2014 00:33:20 -0400 > From: Jonathan Wilkes via Pd-list <pd-list(a)lists.iem.at> > To: pd-list(a)lists.iem.at > Subject: Re: [PD] Jonathan Wilkes via Pd-list <pd-list(a)lists.iem.at> > Message-ID: <53C75210.7000509(a)yahoo.com> > Content-Type: text/plain; charset=UTF-8; format=flowed > > On 07/16/2014 11:36 PM, Simon Wise via Pd-list wrote: > > On 16/07/14 00:15, Dan Wilcox via Pd-list wrote: > >> The onbopard audio might be better, but from what I could tell by the > >> press > >> release, it does't add a dedicated USB controller. In that case, it will > >> probably still have the same issues with USB audio devices. > >> > >>> Anybody played with the new Raspberry Pi model? It claims to > >>> haveimproved > >> audio; I'm curious how that would effect a running instance of Pd on > >> the Pi. > > > > Haven't got mine delivered yet (it is on the way) but looking at the > > (minimal) schematics provided so far they have improved the power .. > > the miniUSB has gone up from 1.1 amps to 2 amps with a regulator > > added. Also the whole is said to draw significantly less power > > (why???) .. so other things have changed also. The USB/Ethernet hub > > has been changed to the 4-out version of the same chip, maybe this > > version is also better in other ways? I don't know if this hub is the > > problem for usb, or if the problem is the usb out of the main chip ... > > if the model A (without this hub) does better with usb audio cards > > than model B then the problem is here, but I have not got a model A to > > test with. > > > > The board layout is completely new, so it might also be cleaner for > > audio? I will test noise and latency when it gets here. > > I ordered one the other day, so I'll definitely test it, too. (I've > never played with an RPI before, so I'll probably doing some general > playing around before getting to Pd specifically.) > > > > > I have just received 2 wolfson audio cards, which use the digital PCM > > link (rather than usb) and also expose another PCM link on a header > > plus a clock input (to the Pi header). They are quite flexible as far > > as clocking goes so several Pis could run these and share a single > > clock source (and pass digital audio between them), so I'll be testing > > that. It mounts onto the B-rev2 using the digital PCM on the 8 holes > > near the main 26 pin breakout. The B+ adds more GPIOs to a 40 pin > > breakout instead which include this stereo PCM link (and several > > others ... the clock, PWM and most of the digital interfaces can now > > be used simultaneously) but the digital audio is on different GPIOs so > > there will need to be some patching and some leads made up to use it > > on the B+. Unfortunately the wolfson card does not bring out the > > balanced audio pins from the chip (it has multiple DAC/ADCs) but > > instead it connects built in stereo mics, 2W amplified outputs and such. > > > > The B rev2 schematics with the old power in and showing the low pass > > filter circuit on the PWM outputs providing the analogue audio: > > > > > http://www.raspberrypi.org/wp-content/uploads/2012/10/Raspberry-Pi-R2.0-Sch… > > > > > > or > > > > > http://www.raspberrypi.org/documentation/hardware/raspberrypi/Raspberry-Pi-… > > > > > > power is top of page 1, audio is lower right of page 2. > > > > the new schematics with new power etc, with no mention of changes to > > the audio filter circuit (just the changes to the audio jack): > > > > > http://www.raspberrypi.org/documentation/hardware/raspberrypi/Raspberry-Pi-… > > > > > > here is a photo with the new layout and new USB chip: > > > > http://www.raspberrypi.org/wp-content/uploads/2014/07/rsz_b-.jpg > > This is all very exciting! > > -Jonathan > > > > > > > Simon > > > > _______________________________________________ > > Pd-list(a)lists.iem.at mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > > > > > ------------------------------ > > Message: 3 > Date: Thu, 17 Jul 2014 15:42:22 +1000 > From: Simon Wise via Pd-list <pd-list(a)lists.iem.at> > To: pd-list(a)lists.iem.at > Subject: Re: [PD] Jonathan Wilkes via Pd-list <pd-list(a)lists.iem.at> > Message-ID: <53C7623E.9080308(a)gmail.com> > Content-Type: text/plain; charset=UTF-8; format=flowed > > On 17/07/14 14:33, Jonathan Wilkes via Pd-list wrote: > > > > > I ordered one the other day, so I'll definitely test it, too. (I've > never played > > with an RPI before, so I'll probably doing some general playing around > before > > getting to Pd specifically.) > > They are good value and compact, but rather limited compared to units that > cost > a bit more. I've done a few projects, they are probably most useful for > video > playback and working with GPIO input, the wolfson card may make them good > for > stereo audio also ... but the access to the GPU is fairly closed and I've > struggled to get them to do what I want, kind of got there ... certainly > playing > a single HD video with sound through hdmi is good, 3D mapping is possible, > also > alpha overlays ... but it is still very much custom per project at the > moment > for me. Playing HD is very much at the limit of what they can do and > requires a > lot of tweaking and compromises depending on what is wanted each time. > They can > do more at lower resolutions. Documentation beyond the sample code is > limited. > The GPIO stuff has some nice libraries and works well. > > Sometime later this year I'll have something more generalised and usable > that I > can share, but for now it really is too messy. > > > Simon > > > > ------------------------------ > > Message: 4 > Date: Thu, 17 Jul 2014 09:01:20 +0200 > From: Nicolas Montgermont via Pd-list <pd-list(a)lists.iem.at> > To: pd-list(a)lists.iem.at > Subject: Re: [PD] readanysf~ on mac OS X > Message-ID: <53C774C0.2010600(a)yahoo.fr> > Content-Type: text/plain; charset="utf-8" > > It is included in Pd extended normally. > You can use Pd-ext or its readanysf~ binary if you use Pd vanilla 32 > bits 0.43+ > n > > Le 16/07/2014 16:09, Oskoff via Pd-list a écrit : > > Hi all! > > > > I am using [readanysf~] http://aug.ment.org/readanysf/ > > and work very well on my ubuntu, but i try the patch in > > a mac OS X and the binary versión from > > http://aug.ment.org/readanysf/download.php dont work > > > > maybe, somebody have made a more update binary ?? > > > > thanks! > > > > oskoff > > > > > > > > > > -- > > oscar martin && [noish] > > ::::::::::::::::::::::::::::::::::::::::::::: > > http://noconventions.mobi/noish > > http://metaminafnr.hotglue.me/ > > http://www.minipimer.tv/ > > http://ursonatefanzine.tk/ > > --------------------------------------------- > > > > > > > > > > > > _______________________________________________ > > Pd-list(a)lists.iem.at mailing list > > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > -- > http://www.nimon.org > >

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A Turkish Book Titled: "Sound Synthesis with Pure Data"
by Arda Eden via Pd-list 19 Jul '14

19 Jul '14

Dear Pure Data Users and Developers, My first book titled “Pure Data ile Ses Sentezleme (Sound Synthesis With Pure Data)” is published in Turkish. If I am not wrong, it is the first published book about Pd, in Turkish language. Any positive or negative critics will be kindly accepted, especially from the ones who can read in Turkish. :) So that, I will be able to correct any found mistakes or add new content. Thanks to all Pure Data community. Here is the link: http://www.kitapyurdu.com/kitap/default.asp?id=699651&sa=172879958

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A Turkish Book Titled: "Sound Synthesis with Pure Data"
by Arda Eden via Pd-list 19 Jul '14

19 Jul '14

Dear Pure Data Users and Developers, My first book titled “Pure Data ile Ses Sentazleme (Sound Synthesis With Pure Data)” is published in Turkish. If I am not wrong, it is the first published book about Pd, in Turkish language. Any positive or negative critics will be kindly accepted, especially from the ones who can read in Turkish. :) So that, I will be able to correct any found mistakes or add new content. Thanks to all Pure Data community. Here is the link: http://www.kitapyurdu.com/kitap/default.asp?id=699651&sa=172879958

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[lop~] coefficient calculation
by Joe White 19 Jul '14

19 Jul '14

Hi, I've been looking at the [lop~] implementation (Pd-0.45-4) and noticed something that seem weird to me. In d_filter, line 176: static void siglop_ft1(t_siglop *x, t_floatarg f) { if (f < 0) f = 0; x->x_hz = f; x->x_ctl->c_coef = f * (2 * 3.14159) / x->x_sr; if (x->x_ctl->c_coef > 1) x->x_ctl->c_coef = 1; else if (x->x_ctl->c_coef < 0) x->x_ctl->c_coef = 0; } Is it correct that for: y[n] = x[n] * a + y[n-1] * b *a = 2π * Fc / Fs* b = 1.0 - a where Fc is the cut-off frequency and Fs the sampling frequency. I appreciate the a coefficient is bounded afterwards but wouldn't that mean that Fc values greater than Fs / 2π will have no impact on the sound being processed. For example if Fs is 44100, then Fc values above ~7020Hz will not affect the filter. Have I missed something crucial or could this a bug in the code? The simple IIR filter described in http://en.wikipedia.org/wiki/Low-pass_filter suggests that the actual coefficient calculation should be more like: a = 2π*Fc / (2π*Fc + Fs) Looking forward to understand this more! Cheers, Joe -- Follow me on Twitter @diplojocus

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readanysf~ on mac OS X
by Oskoff via Pd-list 17 Jul '14

17 Jul '14

Hi all! I am using [readanysf~] http://aug.ment.org/readanysf/ and work very well on my ubuntu, but i try the patch in a mac OS X and the binary versión from http://aug.ment.org/readanysf/download.php dont work maybe, somebody have made a more update binary ?? thanks! oskoff -- oscar martin && [noish] ::::::::::::::::::::::::::::::::::::::::::::: http://noconventions.mobi/noish http://metaminafnr.hotglue.me/ http://www.minipimer.tv/ http://ursonatefanzine.tk/ ---------------------------------------------

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Re: [PD] Jonathan Wilkes via Pd-list <pd-list@lists.iem.at>
by Dan Wilcox via Pd-list 17 Jul '14

17 Jul '14

The onbopard audio might be better, but from what I could tell by the press release, it does't add a dedicated USB controller. In that case, it will probably still have the same issues with USB audio devices. >Anybody played with the new Raspberry Pi model? It claims to haveimproved audio; I'm curious how that would effect a running instance of Pd on the Pi. > >Best, >Jonathan On Tue, Jul 15, 2014 at 6:00 AM, via Pd-list <pd-list(a)lists.iem.at> wrote: > Send Pd-list mailing list submissions to > pd-list(a)lists.iem.at > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.puredata.info/listinfo/pd-list > or, via email, send a message with subject or body 'help' to > pd-list-request(a)lists.iem.at > > You can reach the person managing the list at > pd-list-owner(a)lists.iem.at > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Pd-list digest..." > > Today's Topics: > > 1. Raspberry Pi B+ (Jonathan Wilkes via Pd-list) > > > ---------- Forwarded message ---------- > From: Jonathan Wilkes via Pd-list <pd-list(a)lists.iem.at> > To: pd list <pd-list(a)iem.at> > Cc: > Date: Mon, 14 Jul 2014 09:55:15 -0700 > Subject: [PD] Raspberry Pi B+ > Hi List, > Anybody played with the new Raspberry Pi model? It claims to have > improved audio; I'm curious how that would effect a running instance of Pd > on the Pi. > > Best, > Jonathan > > _______________________________________________ > Pd-list mailing list > Pd-list(a)lists.iem.at > to manage your subscription (including un-subscription) see > http://lists.puredata.info/listinfo/pd-list > > -- Dan Wilcox danomatika.com robotcowboy.com

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Pd-list July 2014