Linux-audio-user October 2007

linux-audio-user@lists.linuxaudio.org

147 participants
141 discussions

Re: [LAU] Which tool to sample 8 audio channel at the same time?

by Kjetil S. Matheussen

Michelle Konzack: > > Hello, > > I am using Debian GNU/Linux (Unstable) on my multimedia machine with a > M-Audio 1010LT and need to sample all 8 channels at the same time. > > Which tool can I use for it? > jack_capture would be a simple and very safe choice: $ jack_capture -c 8 http:/www.notam02.no/arkiv/src/

16 years, 10 months

Re: [LAU] foot switch for pausing/playing audio signals for better transcribing

by arisstotle.54695488＠bloglines.com

If you have a programmable midi keyboard, you can program a foot pedal to send an mmc play/pause command to ardour, and there you have it. --- Chuckk Hubbard" <badmuthahubbard(a)gmail.com wrote: Pure Data is the old standby for me. It's overkill, but it can handle it. > Anything that can take MIDI controller input and playback audio. I'm not > sure if Audacity does that, actually. Rosegarden and Ardour both could, and > now that I think of it you might be able to rig the Jack transport to start > and stop with a MIDI signal, and use that to play Audacity. > > -Chuckk > > On 10/24/07, N. Gey <ilfhi(a)gmx.de> wrote: > > > > Hello list, > > > > The situation is that I often transcribe audio signals (music of course, > > but also spoken words like interviews) to my computer. Its a good > > situation when your hands are free so you can use both hands to write. > > > > I recently read about some expensive usb-footcontroller (USB) which > > somehow connects to an audio program to send start/stop signals. > > This cant be this complicated... there a plenty of midi controllers out > > there which you controll with your food, even the sustain-pedal is > > suitable for the start/stop job. > > > > Do you have any Idea or know of anything which do the described? Just > > sending a signal to a audioprogramm (audacious, audacity, xmms etc.) to > > halt? > > > > greetings, > > Nils > > > > > > _______________________________________________ > > Linux-audio-user mailing list > > Linux-audio-user(a)lists.linuxaudio.org > > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > > > > > > -- > http://www.badmuthahubbard.com > > > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user(a)lists.linuxaudio.org > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > > >

16 years, 10 months

Re: [LAU] [alsa-devel] USB device gives wrong data?

by william estrada

Clemens, I respect your options and appreciate your time, but from what I have read, for a U8 format, silence is represented by a x'7F'. Do you have a source for your option? In pcm_misc.c seems to support your statement: > static struct pcm_format_data pcm_formats[SNDRV_PCM_FORMAT_LAST+1] = { . . > [SNDRV_PCM_FORMAT_U8] = { > .width = 8, .phys = 8, .le = -1, .signd = 0, > .silence = { 0x80 }, So I guess I need to make my filter flexible to match the current hardware device driver? How would you filter out noise? I am new to these interfaces and would like to find a good place to get more information about filters, noise, etc. Any URLs that you could recommend? Thanks again for your time. William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum Clemens Ladisch wrote: > william estrada wrote: >> I think I have found a problem with the USB sound driver? It appears >> that the current drive returns a x'81' for silence but it should be a >> x'7f'. > > The USB audio driver returns whatever data is sent by the device > >> When I use my laptop's sound device and record without a mic, I get >> a file full of x'7f's. If I do the same with my cheap-o USB device >> I get a file full of x'81's. > > For unsigned 8-bit samples, silence is x'80'. > > Apparently, both devices have some DC offset and are quite noisy. > >> I have written a recording program that I have a 'silence' filter >> that filters out segments of dead air. It works with the laptop's >> sound device but not the USB device. The filter works by remove >> x'7f's after allowing a selectable amount. > > Your filter should be able to detect silence even when noise is present. > >> Sorry for the multiple posting, not sure where is should have gone. > > The the linux-audio-dev list, of course. ;-) > > > Regards, > Clemens >

16 years, 10 months

Edirol UA-101

by David Griffith

Does anyone here know anything about the Edirol UA-101? It seems very nice, especially for use with multiple synthesizers. -- David Griffith dgriffi(a)cs.csubak.edu

16 years, 10 months

recorded using arecord, plaback seems a bit fast

by H. S.

Hello, I used the following command to record audio from a live performance using the M2496 [M Audio Audiophile 24/96] card on a machine running Ubuntu Feisty: $> arecord -D plug:hw:1 --duration=600 --file-type au --format=dat --nonblock recording-arecord.au Then I transfered the au file to my home computer and opened it in audacity. When I playback the file, it appears to be being played back at a slightly faster rate. I also tried to encode the original au file to a flac file first, before transfering the file, using this command: $> flac -f --endian=big --channels=2 --sample-rate=48000 --bps=16 --sign=signed recording-arecord.au Then I imported that flac file in to audacity on my home computer. It plays back the same as as the original au file -- seems a tiny bit faster. What could be the problem? thanks, ->HS

16 years, 10 months

use of Linux in music school

by Vedran Vucic

One music school in Serbia started to use Fedora Core 7 with Planet CCRMA collection of audio applications on 4 computers. They use it for teaching the subject of informatics in music school. School will soon purchase 2 additional computers and the both will be Linux Fedora Core 7 with Planet CCRMA. The work is done in cooperation with Linux Center from Serbia. Site of that project is http://muzika.gnulinuxcentar.org (it is on Serbian language). If someone does have experience of using Linux in music school please let me know. Best wishes, Vedran

16 years, 10 months

Re: [LAU] [Jackit-devel] how to get Audacity to work with jack

by Dragan Noveski

Jonatan Liljedahl wrote: > eccn wrote: > >> I hope this isn't a RTFM question, but I've been trying to use jack to >> route audio to & from Audacity. Unfortunately, Audacity does not appear >> on the audio routing patchbay, no matter what sequence I start qjackctl >> or Audacity in. >> >> Please can someone point me the way to a solution? I'm using Ubuntu 6.06 >> LTS (Dapper), qjackctl 0.2.19a, and I can't determine the version of >> Audacity just now. >> > > I think you need to use a version of audacity that has new enough > version of portaudio (v19?) to support jack, right, and i am not sure but i think for that you have to compile audacity from source enabling portaudio-v19 insteed of v18. for finding out which version you are using now, just start audacity and go menu->help. i suppose that you are running something like 1.2.... here: Audacity ® 1.3.3-beta (Unicode) Libmad: Aktiviert Ogg Vorbis: Aktiviert LibID3Tag: Aktiviert FLAC: Deaktiviert LADSPA: Aktiviert Libsamplerate: Aktiviert PortAudio v19 wxWidgets 2.6.3 Programmversion vom: Oct 19 2007 Einstellungs-Ordner:/home/nowhiskey/.audacity-data ..runs fine with jack. cheers, doc

16 years, 10 months

ubuntu studio freebob and fa-101

by Ivica Ico Bukvic

Greetings all, I was wondering if anyone had any success with ubuntu studio and freebob (namely with fa-101). On my machine qjackctl appears to start, fa-101 outputs show up properly and there are no xruns being reported. It works both rt and non-rt, however no audio apps appear to be able of sending any audio data to it. Hydrogen refuses to connect to jack, meterbridge apparently crashes, while Pd appears to connect but no audio is coming out of the soundcard. All of these apps work just fine with qjackctl and internal soundcard. When listening to the FA-101's monitoring I can hear a faint click when jackd is activated/deactivated but other than that no audio is coming out. AFAIK fa-101 has no mixer (or at least one that works) but please do correct me if I am wrong regarding this on the freebob platform. Hence, I was wondering if anyone had an idea as to what could be going on? Many thanks! Best wishes, Ivica Ico Bukvic, D.M.A. Composition, Music Technology, CCTAD, CHCI Virginia Tech Dept. of Music - 0240 Blacksburg, VA 24061 (540) 231-6139 (540) 231-5034 (fax) ico(a)vt.edu http://www.music.vt.edu/people/faculty/bukvic/

16 years, 10 months

recording program request

by william estrada

Hi group, Is it on this list that I read a request from a HAM about logging radio traffic? If you where the one making the request, please send me some Email. I have a solution for you. Sorry I did not save the message. -- William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum

16 years, 10 months

USB midi interface that works

by David Griffith

Would someone please point me towards a USB MIDI interface that is known to work under Linux, particularly with kernels 2.6.18 and later? I acquired a MOTU Fastlane in August because I found references to it in the kernel and statements from others about it and Linux. This turned out not to work. I found that there's a curious bug introduced with kernel 2.6.18 that prevents the interface from working. More bewildering, the bug prevents my noname soundcard's midi interface from working too. Nobody on the kernel mailing list seems interested in the problem. So, what's a good simple USB MIDI interface for Linux? -- David Griffith dgriffi(a)cs.csubak.edu

16 years, 10 months

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Linux-audio-user October 2007