Linux-audio-dev

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7513 discussions

[linux-audio-dev] Viable multi-channel audio I/O boards for Linux ?

by Greene, David L.

linux-audio-dev'ers, I am working in an Operations Center where we want to record 16-20 separate analog audio voice nets/channels along with a few ethernet-based display-data(not video) streams and play them all back individually, selectively or all together for training purposes. The audio nets are better than phone-quality, but not hi-fidelity and 22Khz sampling should be sufficient. There are many turnkey voice-loggers and pc-based "studio" applications but I need the audio recordings closely-coupled with my own recordings of display-net data. I won't be doing a lot of audio processing and would consider a higher rate system with signal processing on board if it just works multi-channels well under Linux. I suppose a multi-channel digital audio I/O board would be just fine as long as I can get 16-20 analog channels converted up front. I am proposing developing this application under Linux but need suggestions on the most viable multi-channel audio in/out boards for use under Linux. Any suggestions ? Thanks ! Dave.

22 years, 10 months

[linux-audio-dev] Re: chebychev

by Bill Schottstaedt

> >It would be more efficient to just calculate the corect chebyshev in > >realtime, the problem is that they have lienar CPU cost with the number of > >harmonics, 20 harmonics for example will be pretty expensive. > > there's one problem i see: if we employ a chebyshev, it is going > to create harmonics no matter what amplitude our incoming signal > [...] > it seems hard to come up with a wave shaper that favours higher > harmonics,[...] I have only been skimming this discussion, but these caught my eye, and I'm wondering what you mean by "chebychev" here. If you're driving a sum Chebychev polynomials with the original signal, none of these statements is necessarily correct -- you can preload a table with the polynomials, so the computational load can be unrelated to the harmonic content; the content will depend on the input amplitude; high harmonics are easy -- just emphasize the relevant polynomial -- probably I don't know what you're talking about.

22 years, 10 months

[linux-audio-dev] Status of Agnula.org?

by Kevin Conder

My brother pointed this out to me... The Agnula project was supposed to have a November release. But neither he nor I are able to connect to their Web server, http://www.agnula.org/. It resolves to the IP address 62.94.60.107 for me but doesn't connect. Is this a technical problem or is this project dead? ===== -- kwconder at yahoo dot com __________________________________________________ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/

22 years, 10 months

[linux-audio-dev] Re: recognition, sort of (Paul Davis)

by RonKuper＠Cakewalk.com

Paul Davis wrote: > Whoa! Someone's paying attention! We love you Ron! When can we get > Sonar on Linux? :)) Hey, thanks! I actually only subscribed to this list about a week ago... trying to keep on top what's going on in the world. When can I get some Linux plugs on Windows? :-) (Had to say that...) -Ron

22 years, 10 months

Re: [linux-audio-dev] I think that what he means is even more important than recognition...

by John Lazzaro

> Paul Davis <paul(a)linuxaudiosystems.com> > > at what point do you expect Digidesign TDM plugins > to fall by the wayside? DigiDesign may be the special case here, assuming that Avid stays independent -- the ProTools business model offers them refuge from consolidation forces, being hardware-restricted and embraced by the high end. Avid's market cap is 370M -- an order of magnitude higher than what Apple paid for Emagic, but still digestable for the likely suitors (Microsoft and Adobe). I use "likely" as a relative term -- the hardware-centric nature of Avid makes it an unnatural fit for both of those companies ... ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

22 years, 10 months

Re: [linux-audio-dev] I think that what he means is even more important than recognition...

by John Lazzaro

> Paul Davis <paul(a)linuxaudiosystems.com> writes: > > its finally dawning on some people that whatever > benefits specific plugin APIs bring to particular products and > hardware, the proliferation of them is actually *more* harmful. i am > skeptical that anyone in the commercial side of things really has the > will to do anything about this, even though they may say they do. Watching the Apple Emagic acquisition, followed by news that Logic would transition to AudioUnits, followed by a mass influx of new AudioUnits developers into the coreaudio-api list, was very enlightening. The economics of commercial plug-in development is such that once Apple owned Logic and made its intentions clear, developers could not help but be interested in supporting the plug-in architecture. There's a natural follow-on move here -- Microsoft buying one or more of the PC flagship applications, and moving them all to support one new or existing standard, that Microsoft licenses freely to all comers (with an anti-GPL poison pill). Then we're back to familiar territory, Microsoft owning one way to do it, Apple owning a second way to do it, and everyone else supporting one or both. The natural reason to expect this not to happen is the small absolute size of the audio content market to a company like Microsoft. However, strategic issues may come into play in Redmond to make this happen -- ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

22 years, 10 months

[linux-audio-dev] recognition, sort of

by Paul Davis

Ron Kuper, VP of Engineering at Cakewalk writes, on vst-plugins: ---------------------------------------------------------------------- That said, we would welcome any effort to unify VST/DirectX/DMO/OPT/MFX/ReWire/TDM/RTAS/MAS/AU/JACK/LADSPA/... ad-infinitum into a single cross-platform plugin API, developed and maintained by an appropriate trade organization or standards group. The proliferation of incompatible standards makes VHS vs. Betamax look like child's play. Our industry needs to unite on this point for more reasons than I can list here. ---------------------------------------------------------------------- Whoa! Someone's paying attention! We love you Ron! When can we get Sonar on Linux? :)) --p

22 years, 10 months

[linux-audio-dev] console JACK metering using ecasignalview

by Kai Vehmanen

Hi, yesterday I released ecasound-2.2.0-pre4 (approaching next stable release, yay!), which has a few JACK-specific improvements: - new command-line syntax for specifying inputs and outputs, see: http://www.wakkanet.fi/~kaiv/ecasound/Documentation/users_guide/html_uguide… - uses the new alsa_pcm:capture_x + playback_X syntax (requires JACK 0.40 or newer ==> CVS!) You can find the package at: http://ecasound.seul.org/download/ecasound-2.2.0-pre4.tar.gz And now to the main point: 2.2.0-pre4 comes with an updated version of ecasignalview. Combined with the new JACK syntax, ecasignalview now suits quite well for monitoring JACK-clients. The basic syntax is: ecasignalview -b:XXX -f:32,YYY,ZZZ jack_auto,foo_client null ... where: XXX = buffersize (jackd's -p:XXX) YYY = number of channels you want to monitor ZZZ = sample rate (jackd's -r:ZZZ) foo_client = any JACK client which uses out_X style port names The meters are drawn with ncurses, while values are queried through the ECI API (ie. ecasignalview is only linked against libc and libstdc++, not for instance against libjack). The output looks like: http://eca.cx/screenshots/ecasound-2.2.0-pre4_ecasignalview.png ... there are a few known bugs, but in general it works quite well. While not really a huge challenge for Steve's meterbridge ;), should be of interest to some of you. -- http://www.eca.cx Audio software for Linux!

22 years, 10 months

[linux-audio-dev] [ANN] TiMidity++ now on sourceforge

by Takashi Iwai

Hi, the development tree of the latest TiMidity++ was moved onto sourceforge now. http://sourceforge.net/projects/timidity/ there is a cvs branch, "R2_12_0_pre1b", which includes bunch of enhancement patches. the patches sent on the timidity developer ML (in japanese) are (occasionally) sync'ed with this tree. also, an english mailling list was opened for non-japanese-speaking developers and users: http://lists.sourceforge.net/mailman/listinfo/timidity-talk hope many people have interest and join to this project. ciao, Takashi

22 years, 10 months

Re: [linux-audio-dev] Free Publicity - DJCJ Linux Audio Developers Tech Support Database.

by Patrick Shirkey

Thanks for all the helpful feedback.I have updated the main page for the djcj site. I have tried to compromise as much as possible. I also found an annoying bug in the Technical support database which was dropping some of the variables before they were inserted and added a table for notes in case you want to be specific about things :) The database is now working properly again. For those of you who submitted info but did not see yourself appear you can either resubmit and I will clean up by hand or you can wait for a couple of weeks until we have the login scripts working. Any suggestions for the wording on the page to make it more representative are appreciated. I want the database to be accesible to anyone who can provide professional support in any way shape or form for Linux Audio. http://www.djcj.org Best regards. -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== "Um...symbol_get and symbol_put... They're kindof like does anyone remember like get_symbol and put_symbol I think we used to have..." - Rusty Russell in his talk on the module subsystem

22 years, 10 months

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Linux-audio-dev