Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

3 participants
7440 discussions

by Tim Blechmann

hi steve and list again ... there is another problem with the ladspa plugin flanger, that's quite annoying ... if i change the lfo frequency, there is a good chance of the plugin to become unstable ... i suppose it's a denormal problem, but i'm not sure ... does anyone have a hint, what the problem might be, how to solve it? cheers... Tim mailto:TimBlechmann@gmx.de ICQ: 96771783 -- The only people for me are the mad ones, the ones who are mad to live, mad to talk, mad to be saved, desirous of everything at the same time, the ones who never yawn or say a commonplace thing, but burn, burn, burn, like fabulous yellow roman candles exploding like spiders across the stars and in the middle you see the blue centerlight pop and everybody goes "Awww!" Jack Kerouac -- Tim mailto:TimBlechmann@gmx.de ICQ: 96771783 -- The only people for me are the mad ones, the ones who are mad to live, mad to talk, mad to be saved, desirous of everything at the same time, the ones who never yawn or say a commonplace thing, but burn, burn, burn, like fabulous yellow roman candles exploding like spiders across the stars and in the middle you see the blue centerlight pop and everybody goes "Awww!" Jack Kerouac

20 years, 5 months

[linux-audio-dev] LA Conference#2 Programme PDF now online

by Frank NEUMANN

Hi all, just a little update on what's going on with the upcoming Linux Audio Conference in Karlsruhe on April 29th - May 2nd: The programme is now available as a PDF, too - just visit http://www.zkm.de/lad and click on the PDF link. While this is not necessarily the absolutely final version of the programme, there should not be big changes anymore from now on. We have one additional highlight with a presentation by someone from Hartmann showing the Neuron (which also uses LinuxInside :-), and in general I'm really quite excited now about the whole event. I hope you'll like it, too. The PDF is also ideal to give out at local Linux users group meetings etc to do some advertising there - we welcome that! Greetings, (and hope to see some of you soon), Frank

20 years, 5 months

[linux-audio-dev] [Tech-OT] Succeeding in following-up...

by Mr.Freeze

Hi, I definitely cannot keep a good tree on the threads I start (take a look at "PdDSP?" and you'll see what I mean)... I've tried most combinations of those '[mailing-list]', 'Re:' and 'Place-your-title-here' strings unsuccessfully. What's the best way to achieve good results, provided I suscribed for a daily batched message list, and therefore cannot answer directly to the original messages? Hoping you'll not throw me away to the creeping forum world, Christian Frisson

20 years, 5 months

[linux-audio-dev] Re: [Tech-OT] Succeeding in following-up...

by Mr.Freeze

Re: ,-) Frank Barknecht wrote: > Funnily only at those mails by "Mr. Freeze". ;) Freezing mails? ;-) Blame my ISP built-in anywhere-accessible Horde IMP php-based client, randomly printing plain text: http://www.horde.org/imp/ Should I go for MIME / HTML transcription? No, yuk! > Remember: "All mail clients suck. This one just sucks less." > (Mutt manual) So do emails... http://www-cse.stanford.edu/classes/cs201/projects-00-01/personal-lives/ema… One point for forums: clear syntax and thread traceability ,-) No, I don't wanna revive that neverending topic... Cheers, Mr°Freeze

20 years, 5 months

Re: [linux-audio-dev] Re: [Tech-OT] Succeeding in following-up...

by Mr.Freeze

Title: "Re: [linux-audio-dev] Re: [Tech-OT] Succeeding in following-up..."

20 years, 5 months

[linux-audio-dev] Theremin-style controller (residual "PdDSP?")

by Mr.Freeze

Hi, If a PureData-powered expander turns to be a miniITX PC, then I'll stick to the benefits of my Shuttle barebone! Let's leave this "PdDSP?" thread have a little rest... Paul Winkler wrote: > IIRC, there was a midi theremin-style controller kit available from PAiA. Not right out of the box actually! The CV outs of the PAiA Theremax have to be routed to their MIDI Brain in Fader configuration (other other equivalent-in-use MIDI trigger), so that it sends well-chosen MIDI CC's, but the MIDI Note On/Off's have still to be monitored by the next-in-chain device. But check the whole schematic (by downloading the PAiA "every-month-it's-this-month's" freebie, i.e. the Theremax manual)... Hard-dying maze! > Check google, what you want might already exist. When it comes to renew the Theremin sensing principle, as opposed to remember the byegone days (no offence here), I think I can slim-out the schematic like Toby Paddock did here: http://www.seanet.com/~tpaddock/c2cv.html QProx QT300/301 are cheap Capacitance to Analog Converter IC's with 16 bit continuous or 8 bit PWM outputs: http://www.qprox.com/products/qt300_301.php And best of all, their calibration phase can simply be achieved by flicking switches at extreme hands positions! Forecoming issue: compliance with the MIDI protocol (bit-depth, transmission rate...). Pointed out by an article of a QProx concurrent, the Motorola MC33794: http://www.circuitcellar.com/library/print/0603/cantrell155/ Quoting its author: "In fact, by slightly raising and lowering my hand, I could see the discrete quantization steps associated with the MCUs 8-bit ADC. My hand-waving experiments would have been better served with a 10- or 12-bit ADC (or an external programmable amp)." I'll expand my theory on it later (written long enough for the moment)... After all, the heterodyning principle (i.e. getting the sum and difference of two oscillators at close frequencies) was used on the original Theremin only due to accidental manipulations: during military ham radio tweakings! The trademark "beating" sound followed up... Dave Robillard wrote: > I don't really see what your Theremin-style MIDI controller has to do with > the synth. It's a MIDI controller, it's seperate from all that stuff by > design. I share your point of view. I just wanted to stay open-minded to prospective other users, who would justify the need of a live use... > I'd just write a program to do it. If you really think a nice little DSP box > would be useful, do that later. You've got enough problems on your hands > building the controller. One step at a time. ;) Postponed. Using laptops or sub-multipleITX PC's on the stage will certainly be more familiar by the time... Frank Barknecht wrote: > You can use a whole bunch of input methods in Pd: Midi, score following with > the fiddle~ external (play on your theremin and feed the audio into Pd, > fiddle~ converts it to frequency values), USB over the event interface on > Linux, parallel port, serial port input, joystick, probably many more. Pd is > quite a happy to speak with anybody. PureData can already start the software compatibility list then! Cheers, Christian Frisson (who *shivers* when hearing Theremin sounds)

20 years, 5 months

Re: [linux-audio-dev] Re: PdDSP?

by Mr.Freeze

Heya, Frank Barknecht wrote: > Sukandar Kartadinata ist working on something like this for some time > now. See http://glui.de/proj/gluiph.html for a general project > description (careful, psycedelic website!) and this PDF: Interesting! > You could start with the PD for PDA project, which did this, but for > Pd 0.32. We're now at Pd 0.37 on general purpose computers. I'll definitely not go for an ARM-powered expander! Let me explain the facts, what I should have done from the beginning: I'm planning to build a special controller based on the Theremin, with MIDI and/or CV outs. All material released for free: schematics, software... The Theremin does have a trademark sound, even if most think it's a pure sine wave; but the aforementionned controller won't reduce itself to this: I'm more interested in its sensing technology. Yet, I was wondering if an built-in expander was needed in addition, for live use; or if it could simply rely on a computer (my use). Hence my idea to use a kinda port of PureData to DSP so that the user could get the same sound either from hardware or software means, just by dumping patches; instead of having to write a separate pure C/C++ DSP source code with specific non-compliant patches, or even having to advice proprietary synth expander to the prospective users. But what I do not want to do is building myself another computer... I thought DSP-powered expanders had one big advantage over PC-based expanders: the lack of crashes... Trick or treat? What's your opinion? Cheers, Mr°Freeze

20 years, 5 months

[linux-audio-dev] PdDSP?

by Mr.Freeze

Hi, Quirky question: is it possible to run PureData (or another <place_your_name_here> *modular*) on a DSP (or, still, another <place_your_name_here> microcontroller) under a port of Linux? I was thinking of building an hardware expander that would share the patches of its software counterpart, just by dumping them on the device... Does "m68k" refer to a family of Motorola DSPs? http://www.linux-m68k.org >From the Alpha (64 bits) to the ARM (32 bits), between the MIPS (32 bits) or MIPS-64 (64 bits), short-cutting to the PA-RISC (32 bits), U-turning by the SPARC (32 bits) and SPARC64 (64 bits versions)... what applications are this bugs aimed at? You'd want to think: "how could he manage to do that provided the questions he asks?" ;-) Cheers, Christian Frisson

20 years, 5 months

[linux-audio-dev] Re: PdDSP?

by Mr.Freeze

Re-, The prime objective of my "PureBabbling" was to introduce the names of microprocessors/controllers whose specifications or applications I don't even know of, hence the question! Neat word, though ,-) My only friends are TMS320C31 and 16F873... So it's not worth dreaming of a DSP-powered PureData synth... Let's turn the problem inside-out: I could still create a PureData module that could convert its native patches to the DSP power C/C+ synth! ++ Mr°Freeze

20 years, 5 months

[linux-audio-dev] Pitchshift/Timestretch project..

by Frank NEUMANN

Hi all, I was made aware of a new project yesterday, to be found at http://clearscale.org. The idea is to produce a commercial-grade and open- source pitchshifting/timestretching library. libSoundtouch might be nice as it is, but if you really stress it, the artifacts come in quite quickly (in my opinion). I believe in this field Linux software is still a good deal away from Win*/Mac software, so this project sounds very interesting to fill a gap. When you visit the web site, you'll notice that the author is seeking some kind of financial reward for his work (through PayPal). This might sound quite unusual at first, but I think it is justified. The important fact to know here is that the maintainer, Stephan M. Bernsee (formerly known as Stephan M. Sprenger) is (to my knowledge) the mastermind behind the German company ProSoniq, producers of e.g. the OrangeVocoder and TimeFactory. These products always get great reviews in german (and probably also international) keyboard magazines. He _really knows_ what to do; he has proven that in the past. He also developed some part of the Hartmann Neuron (don't ask me for details - I don't have any), and his webpage (www.dspdimension.com) contains very useful information that is even used at some german universities for lectures about signal processing. In other words: If he really goes for this, the results might be fantastic. With a bit of luck, Stephan will show up in Karlsruhe at our Linux Audio Conference - maybe he can explain some more thoughts there. Anyway, I believe this project deserves to be sponsored somehow. No, I am not affiliated..blabla..just my personal opinion..yadayada :-). I simply believe this is hot information. Greetings, Frank

20 years, 5 months

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Linux-audio-dev