Linux-audio-user November 2007

linux-audio-user@lists.linuxaudio.org

131 participants
119 discussions

by william estrada

Hi group, I wish to thanks all of you for the responses about 'better mics'. I think I need to clarify what I am looking for. I'm writing a suite of programs to be used for a 'Voice Messaging System'. The system will be used during field events where communication from PC to PC will take place. There by the need for inexpensive hardware. We are dealing with cheap HAMs here after all! So supplying everyone with a mic is going to be costly to begin with. A preamp, which is the best solution, will be too costly. So I need to build a software fix. My next question for the group, are there any URLs dealing with sound software algorithms? Routines to increase volume, building filters. removing noise, etc. I have done a Google search but I guess I am not using the right search strings? I'm not looking for programs but just the code to do it. Thanks again to all of you for your time. This group has been very helpful. -- William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum

16 years, 5 months

Getting sound from Mozilla to jack ?

by Svend-Erik K Madsen

Hi What I want is the possibility to be able to route output from streams in Mozilla or any browser to my jackqctl, is that possible ? It seems that I cannot find any jack module for Mozilla. I've fiddled a lot with .asoundrc without any luck so far. /Sv-e

16 years, 5 months

Re: [LAU] [LAA] Amuc version 1.5

by Dave Phillips

W.Boeke wrote: > Amuc (the Amsterdam Music Composer) version 1.5 has been available for some > monthes already, but here is the official announcement. > > http://members.chello.nl/w.boeke/amuc/index.html > > Amuc is a light-weight tool for composing and playing music. 'Light-weight' in > the sense of not needing graphical or other toolkits. It is very fast and > offers useful features to help the inexperienced composer. Now it also > incorporates a pitch extractor, translating a wave file to notes. Listen to a > fast solo by John Coltrane on saxophone, followed by the extracted tune with > a simple accompaniment, and then with a synthetic bass gitar and sampled drums: > > http://members.chello.nl/w.boeke/amuc/john_c.mp3 Now that is very cool. I'm going to have to write an article about AMUC soon... AMUC built without complications on 64 Studio (64-bit), I only needed to add the libusb-dev package. Thanks for the neat software ! Best, dp

16 years, 5 months

Re: [LAU] SSH and pyseudo tty

by william estrada

Robert, You where exactly right! I was missing the dups. Thanks. William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum Robert Hajime Lanning wrote: > When you fork() for the ssh call, before you exec(), you need to: > open the pseudo terminal as stdin, stdout, stderr.

16 years, 5 months

Re: [LAU] Software algorithms?

by Sampo Savolainen

Quoting david <gnome(a)hawaii.rr.com>: > I think what you need is to use cheap computer mics, not music-quality > ones, that should only need to plug in to an 1/8th-inch audio in > connection on a sound card. I don't think those kinds of mics require a > preamp of any kind. They do require a sort of preamp, but every soundcard which provides the 5V supply voltage for the electret capsule will have such a preamp. These 5V mic supplies are usually in every "normal" soundcard. I'm not talking about the ones you buy from the store but the ones which are included in your computer by default. HAMs will like a bit of soldering, so check this out: http://www.epanorama.net/circuits/microphone_powering.html It includes information on how to connect the capsules and information on the voltage provided by mic inputs on soundcards. Electret capsules can cost < $1 so it should be cheap enough for your needs. Sampo

16 years, 5 months

bad_alloc

by Norval Watson

Both Hydrogen and Freewheeling are crashing on my system with the following message: terminate called after throwing an instance of 'St9bad_alloc' what(): std::bad_alloc Aborted Linux debiansid 2.6.23-rt1 #1 SMP PREEMPT RT debian sid amd64 jackd 0.103.0-6 buffer size 64 hydrogen 0.9.3-5 freewheeling 0.5.5 from svn Any clues on this one? Norv National Bingo Night. Play along for the chance to win $10,000 every week. Download your gamecard now at Yahoo!7 TV. http://au.blogs.yahoo.com/national-bingo-night/

16 years, 5 months

Line noise

by leslie.polzer＠gmx.net

Hello everyone, I'm trying to get my electric guitar connected to my sound card. Keeping the card's input gain low keeps away the noise, but produces a very low signal. I can put Jamin right after that and crank up the input gain, but there's a maximum to it and I'm not sure whether that's the right approach. Turning up the card's input volume increases the gain, of course, but it delivers a lot of very ugly noise as well. If I connect a microphone to the port, I get a high-gain signal without noise. The card's an SB Live! Platinum, and the mic port seems to be the only capture port usable by Jack. The cabling for the guitar is all new. I can provide samples of the input signal at the various settings if you wish. Leslie -- Personal homepage: https://viridian.dnsalias.net/~sky/homepage/ gpg --keyserver pgp.mit.edu --recv-keys DD4EBF83

16 years, 5 months

Re: [LAU] Good mic for voice?

by william estrada

Paul, I have being thinking about a software fix. Do you have some example code of how to do a 'compressor' or up the volume? I think that would be a better solution. Trying to keep the hardware cost down. It will be a multi-user environment. -- William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum > Date: Wed, 31 Oct 2007 08:19:07 -0600 > From: Paul Winkler <pw_lists(a)slinkp.com> > Subject: Re: [LAU] Good mic for voice? > > On Tue, Oct 30, 2007 at 09:24:59AM -0700, Florin Andrei wrote: >> > If you care more about sound quality, there's a #4 choice too: insert a >> > compressor between the mic preamp and the computer. The RNC1773 (a.k.a. >> > "Really Nice Compressor") provides an excellent performance/price ratio, >> > but other choices are available too if you do some research. > > While I have (and love) an RNC, it's worth noting that a compressor > can be done in software (I've been pretty happy with SC4 from Steve > Harris' plugin set), but the rest of the stuff requires hardware. > > Also, an alternative to buying a standalone preamp: get a small mixer. > You get multiple preamps and a lot more functions that are endlessly > useful in even the smallest home studio. > The Mackie 1202 in its various incarnations is a solid choice. > I got mine on ebay. > > -- Paul Winkler

16 years, 5 months

5-day course 'Linux for music & audio', NOTAM (Oslo) november 12-16

by andersvi＠extern.uio.no

Announcing 5-day workshop in Linux audiowork at NOTAM (Oslo, Norway) - november 12-16. The use of Linux in sound and musicwork is spreading out fast. This course will start with a short intro to Linux as working-environment, and continue diving deeper into relevant sound- and music applications. The content of the course will be adjusted according to the participants needs wherever possible. Typical sound-related tasks which will be focused on are: + installation of Linux, distributions, Live-media general intro to Linux, standard-apps (web, email, file-handling, audio/video/text/graphics) + discussion about typical Linux-relevant hardware: PC, Mac, things, gadgets, boxes... + intro to standard soundware on Linux, recording, playback, editing, mixing -- Ardour, Jack, PD, Snd, SuperCollider, Audacity... + compositionsystems, notation, sequencers, MIDI-tools, DSP-tools + use of NOTAMs Linux-equipped labs and studios + interactive control, sensors, installation-setups + studiowork: recording, mixing, mastering + realtime soundwork for concerts and installations Everything relevant to participants own projects (if any). The whole workshop will end in a small concert at NOTAM on the last day of the course. Participants may bring their own computers to get a good Linux-based music & audio-workstation up and running, and will be guided through installation and configuration. More info (Norwegian only): http://www.notam02.no/notam02/kurs-linux-for-lyd.html Questions to Notams PEO: Asbjørn Flø <asbjorn.flo(a)notam02.no> or to this group. Cheers, Anders Vinjar

16 years, 5 months

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Linux-audio-user November 2007