Linux-audio-dev

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6 participants
7490 discussions

by Bill Schottstaedt

> good god. know an alternative source for calculating the > coefficients? Bill? The classic article, in this context, is "Digital Waveshaping Synthesis" Marc Le Brun JAES 1979 April, vol 27, no 4, p250 Daniel Arfib, at the same time but independently, did similar work -- I don't know a reference. I think DiPoli wrote a good overview -- perhaps in Roads "The Music Machine"? CLM has code both for the table-oriented and polynomial-oriented approaches. There's an example "brighten" instrument in clm.html.

22 years, 5 months

[linux-audio-dev] Re: [Jackit-devel] 2.4.20-rc1 + lowlat + preempt + alsa + jack = dead computer

by Stefan Nitschke

>From: Fernando Pablo Lopez-Lezcano <nando(a)ccrma.Stanford.EDU> >Is anyone out there trying out this combination?: > > kernel 2.4.20-rc1 > capabilities patch > low latency patch > preemptible kernel patch > almost current alsa cvs [20021028.170432 usa pacific time] > >If I start jackd and then use the freqtweak jack client I get a completely >dead machine in a very short time (from a few seconds to 10 or 20 >seconds). > >... > >Interestingly enough just the jack server running is not enough to kill >the machine. Adding a jack client (just tried alsaplayer, same problem as >freqtweak) kills the machine really fast. > I have excactly the same problem since i upgraded my machine to SuSE 8.0, which is based on: kernel 2.4.19-SuSE + capabilities patch + low latency patch. Stefan _________________________________________________________________ Surf the Web without missing calls! Get MSN Broadband. http://resourcecenter.msn.com/access/plans/freeactivation.asp

22 years, 5 months

[linux-audio-dev] ok, jump on slashdot right now, ALSA story in progress

by Paul Davis

i don't want to blow my moderator points this time, so get busy. there is lots of confusion, mis-information and general cluelessness in the responses so far. get to it, provide me with some stuff to moderate upward ... --p

22 years, 5 months

[linux-audio-dev] RE: linux-audio-dev digest, Vol 1 #127 - 2 msgs

by Brad Arant

Havent been receiving any news lately, please help. -----Original Message----- From: linux-audio-dev-admin(a)music.columbia.edu [mailto:linux-audio-dev-admin@music.columbia.edu]On Behalf Of linux-audio-dev-request(a)music.columbia.edu Sent: Saturday, July 27, 2002 9:00 AM To: linux-audio-dev(a)music.columbia.edu Subject: linux-audio-dev digest, Vol 1 #127 - 2 msgs Send linux-audio-dev mailing list submissions to linux-audio-dev(a)music.columbia.edu To subscribe or unsubscribe via the World Wide Web, visit http://music.columbia.edu/mailman/listinfo/linux-audio-dev or, via email, send a message with subject or body 'help' to linux-audio-dev-request(a)music.columbia.edu You can reach the person managing the list at linux-audio-dev-admin(a)music.columbia.edu When replying, please edit your Subject line so it is more specific than "Re: Contents of linux-audio-dev digest..." Today's Topics: 1. Re: runtime / compiletime processing proof of concept (Paul Winkler) 2. Re: runtime / compiletime processing proof of concept (Juan Linietsky) --__--__-- Message: 1 Date: Fri, 26 Jul 2002 13:00:10 -0400 From: Paul Winkler <pw_lists(a)slinkp.com> To: linux-audio-dev(a)music.columbia.edu Subject: Re: [linux-audio-dev] runtime / compiletime processing proof of concept Reply-To: linux-audio-dev(a)music.columbia.edu On Fri, Jul 26, 2002 at 01:21:46PM +0200, Maarten de Boer wrote: > Hello, > > Juan Linietsky (reduz on #lad) talked on #lad about an idea of > Benno to have processing graphs generate source code, compile > it on the fly, thus taking advantage of all compiled optimizations, > as an alternative to runtime processing. Especially for sample > based processing instead of block based processing this can be > very useful and a lot faster. John Lazarro tells me that sfront does something similar. He says it's described here: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/pdf/wemp01.pdf --PW --__--__-- Message: 2 Date: Fri, 26 Jul 2002 14:38:40 -0300 From: Juan Linietsky <coding(a)reduz.com.ar> To: linux-audio-dev(a)music.columbia.edu Subject: Re: [linux-audio-dev] runtime / compiletime processing proof of concept Organization: Codenix Reply-To: linux-audio-dev(a)music.columbia.edu On Fri, 26 Jul 2002 13:56:55 +0200 Maarten de Boer <mdeboer(a)iua.upf.es> wrote: > > What i forgot to mention: > > The most interesting thing is that the code used for runtime, and > the generated code used for on the fly compilation is actually the > same! Which ensures that the result of runtime execution and > compiling generated code -> execution is the same, and everything > has to be written only once. > > maarten > Hi! Thanks for taking the time of writing a proof of concept program. So far from what i've been reading it seems ok (didnt have much time to check the entire code in detail) althought the real advantage of compiling such graphs is when they are very large and stack/buffer and indirection operations start to really slow it down. Still, even whith this, i get (please tell me if these are correct): realtime code: (./main) real 0m1.005s user 0m0.970s sys 0m0.030s runtime code: (./gen) real 0m0.435s user 0m0.370s sys 0m0.060s three seems to be quite a difference! Juan Linietsky --__--__-- _______________________________________________________ linux-audio-dev Mailing List Digest http://music.columbia.edu/mailman/listinfo/linux-audio-dev End of linux-audio-dev Digest

22 years, 5 months

RE: [linux-audio-dev] Interesting USB MIDI master keyboards, do t he work with Linux ?

by STEFFL, ERIK (SBCSI)

> -----Original Message----- > From: Josh Green [mailto:jgreen@users.sourceforge.net] > > > On Thu, 2002-10-31 at 19:09, Benno Senoner wrote: > > Perhaps old news but I saw these interesting USB MIDI > master keyboards > > > > http://www.harmony-central.com/Newp/2002/PCR-30-PCR-50.html > > > > I'm considering getting one so my questions are: > > > > - What's the status of USB MIDI on Linux ? Are such kind of > keyboards fully > > supported ? (eg transmit all the params as midi events or > use special USB > > message) > > > > - what kind of Note-on MIDI latency do these keyboards have ? > > (standard midi keyboards 1.1msec) > > > > thanks, > > Benno > > > > New news to me! I was thinking of getting an Oxygen 8 for use with my > laptop but was bummed about it not having a MIDI input or pedal > controls. Both of which I see are included with those 2 > keyboards. Looks > like I'll be getting one of those if they work in Linux of course :) the specs say they have midi in/out (in addition to usb) so they should work with linux, right? quote: "MIDI Interface (in/out), USB Interface" erik

22 years, 5 months

[linux-audio-dev] [ANN] swh plugins v0.3.0

by Steve Harris

http://plugin.org.uk/releases/0.3.0/ Includes the most often requested thing, compressors. SC1 - mono in, mono out variable knee compressor SC2 - mono in, mono out variable knee compressor w/ permenantly wired sidechain. SC3 - stereo in, stereo out etc. with selectable sidechain. Many thanks to Mark K. for extensivly testing the algorithm. There are also a couple of new, very low level plugins, quality improvements on the gong and plate reverb, serious speed improvements on the valve plugin, and noticable, but not stunning improvements to various other things. Oh, and I finally fixed the prefix stuff in the configure.in. Its still broken for MacOS X, and I no long have access to a box, so if anyone fancies fixing the autoconf I can point you in the right direction. - Steve

22 years, 5 months

[linux-audio-dev] Interesting USB MIDI master keyboards, do the work with Linux ?

by Benno Senoner

Perhaps old news but I saw these interesting USB MIDI master keyboards http://www.harmony-central.com/Newp/2002/PCR-30-PCR-50.html I'm considering getting one so my questions are: - What's the status of USB MIDI on Linux ? Are such kind of keyboards fully supported ? (eg transmit all the params as midi events or use special USB message) - what kind of Note-on MIDI latency do these keyboards have ? (standard midi keyboards 1.1msec) thanks, Benno --- http://linuxsampler.sourceforge.net Building a professional grade software sampler for Linux. Please help us designing and developing it.

22 years, 5 months

[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, 5 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, 5 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, 5 months

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Linux-audio-dev