Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

3 participants
7520 discussions

by Juhana Sadeharju

>From: Dr.Graef(a)t-online.de (Albert Graef) > >does anyone know a library (preferably C/C++, or anything that >interfaces to it) which implements the Prony algorithm (a.k.a. least >squares fitting of a sampled signal to a sum of damped sinusoids)? I placed a couple of papers at ftp://ftp.funet.fi/pub/sci/audio/devel/dsp/ Please make the source code available (GPL or public domain or equivalent). Do you need more papers? I need a detailed spectrogram to Audacity. Audacity may now have only FFT based linear scale spectrograms. I will draw manually the pitch curves over the display. Instruments to be analysed are flutes, violins and guitars. Both time and frequency accuracy should be good when tracing the single pitch curve. I will check more papers on the topic but I really would like to see an overview of what techniques are available. Maybe a search in the web helps. Juhana

21 years, 5 months

[linux-audio-dev] jack_ringbuffer_read_space() question

by Tom Szilagyi

Hi, I have a program with some (p)threads, and a jack ringbuffer. One thread is writing to the ringbuffer, and another is reading from it. The question is: is it (thread-)safe to have a _third_ thread that looks at the ringbuffer via jack_ringbuffer_read_space() at random times to determine how much data is in the ringbuffer? This third thread does not actually read nor write any data to/from the ringbuffer, just wants to know the amount of data in it. So far I didn't see any crashes/lockups, is it really safe to do this or just my dirty luck? :) Thanks, Tom

21 years, 5 months

[linux-audio-dev] [ANN] seq24-0.5.1

by rob buse

Hey everyone! There is a new version of seq24 up. http://www.filter24.org/seq24/ * Added button for seperate note length. * Mouse wheel can now change values in editor. * Many misc bugs fixed. cheers!! rob buse ------------------------------------------------------ http://filter24.org art + technology _______________________________________________________ Sent through e-mol. E-mail, Anywhere, Anytime. http://www.e-mol.com

21 years, 5 months

[linux-audio-dev] Re: [Jackit-devel] new low latency patch for 2.6

by Ingo Molnar

* Jeremy Hall <jhall(a)maoz.com> wrote: > I compiled this on SMP and when I enabled preempt in /proc/sys/kernel > commands worked for a few seconds, then the machine crashed. It > responded to pings but otherwise was dead in the water. When I > enabled voluntary preempt as well, the machine almost immediately > crashed. > > The note says that you should be able to switch from the four modes of > operation at will while the machine is running. Is that true? it's true, it should work. This is probably a bug in the patch. Investigating it. Ingo

21 years, 5 months

[linux-audio-dev] [ANN] Digital Room Correction (DRC) 2.4.2

by Denis Sbragion

Hello, DRC 2.4.2 has been released and is available at: http://freshmeat.net/projects/drc Changes: This release features better handling of underflow problems during homomorphic deconvolutions. There were some speed improvements. Search and output of peak value and peak position were added to lsconv. Best of listening, -- Denis Sbragion InfoTecna Tel: +39 0362 805396, Fax: +39 0362 805404 URL: http://www.infotecna.it

21 years, 5 months

[linux-audio-dev] Length of a soundfile in a script

by Hans Fugal

I thought sox might be able to do it but I don't see it if it's there. I want to know how long (in time) an audio file is. Preferably output the number of seconds or some fraction thereof to stdout, and preferably can handle a large variety of sound types like sox (but if not, I can use sox). I know I could use sox to output raw and get the size of the resulting file and do a little arithmetic, but that would be silly if there's a utility for doing this sort of thing. Why? I have my computer as an answering machine, and don't want to be bothered with hangups (very short messages). BTW, an answering machine is great fun to mess with all sorts of audio things, especially the beeps. :-) -- .O. Hans Fugal | De gustibus non disputandum est. ..O http://hans.fugal.net | Debian, vim, mutt, ruby, text, gpg OOO | WindowMaker, gaim, UTF-8, RISC, JS Bach --------------------------------------------------------------------- GnuPG Fingerprint: 6940 87C5 6610 567F 1E95 CB5E FC98 E8CD E0AA D460

21 years, 5 months

[linux-audio-dev] new low latency patch for 2.6

by Thomas Charbonnel

Hi, This is great news, Ingo Molnar strikes back with a low latency patch for 2.6 ! See the original message here : http://groups.google.com/groups?q=Voluntary+Kernel+Preemption+Patch&lr=&ie=… Direct link to the patch against 2.6.7-bk20 : http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.7-bk20-H2 Thomas

21 years, 5 months

[linux-audio-dev] Signals and Threads

by Michael Ost

Howdy, list: Does a signal handler (like segfault, or divide by zero) run at the priority of the thread that it gets generated for? Say thread 1 is normal prio and thread 2 is SCHED_RR thread. In normal operation thread 1 can't interrupt or supersede thread 2. Does this hold if, say, thread 1 gets a SEGV signal? Does its handler wait until thread 2 is not running to do its thing? And does it get interrupted if thread 2 wakes up while the handler is working? It would seem that signal handlers use a threads priority, from scanning the web and docs, given that threads have their own signal masks and handlers. But perhaps one of you knows this stuff off the top of your head? I want to improve how our system reacts to a crash, but I'm concerned that the real time audio processing thread will keep the signal handler from reacting promptly. I'm running Linux kernel 2.4.19 with glibc 2.3.2 which provides the libpthread implementation we use to create threads. Thanks in advance for any help... mo ========================= Michael Ost, Software Architect Muse Research, Inc. most(a)museresearch.com PS: moderator, I tried to remove a similar message sent from another email account, but the 'remove' code didn't work.

21 years, 5 months

[linux-audio-dev] Prony algorithm?

by Dr.Graef＠t-online.de

Hi, does anyone know a library (preferably C/C++, or anything that interfaces to it) which implements the Prony algorithm (a.k.a. least squares fitting of a sampled signal to a sum of damped sinusoids)? TIA Albert -- Dr. Albert Gr"af Dept. of Music-Informatics, University of Mainz, Germany Email: Dr.Graef(a)t-online.de, ag(a)muwiinfa.geschichte.uni-mainz.de WWW: http://www.musikwissenschaft.uni-mainz.de/~ag

21 years, 5 months

Re: [linux-audio-dev] Tutorial on Professional Audio GNU/Linux Tools

by Aaron Trumm

And did you find RoseGarden and Ardour we're sync'd up tightly? I have yet to find them REALLY syncing really tightly.... what distro are you on? what versions of the software? what hardware? ------- NQuit www.nquit.com ------- ----- Original Message ----- From: xamat(a)iua.upf.es Sent: 7/8/2004 6:13:42 PM To: linux-audio-dev@music.columbia.edu;developers@lists.agnula.org Subject: [linux-audio-dev] Tutorial on Professional Audio GNU/Linux Tools > > Hi all, > > Today we (I should say Pau Arum?and Maarten de Boer) have given a > tutorial on Professional Audio tools in GNU/Linux in the context of some > conferences on Free Software held near Barcelona, Spain. > > We have showed a great deal of applications. The final demonstration > consisted on reproducing a real professional recording studio situation. > This has been accomplished using Ardour for multitrack recording and > mixing, RoseGarden for MIDI sequencing, Jamin for mastering, qjackctl for > connecting it all and, of course, ALSA. We have recorded live audio tracks > (bass guitar) as well as MIDI from a keyboard controller. Ardour and > RoseGarden have been synchronized and the output of RoseGarden has been > recorded into Ardour. After applying some LADSPA plugins in Ardour, the > final mix has been sent to jamin for the mastering process. All > connections via Jack. > > Everything has worked perfectly so I just wanted to share the success with > all the community and especially congratulate all the developers behind > those great applications and GNU/Linux audio in general. > > ------------------------ > Xavier Amatriain > Music Technology Group > Universitat Pompeu Fabra > www.iua.upf.es/~xamat > -------------------------

21 years, 5 months

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Linux-audio-dev