Linux-audio-user February 2010

linux-audio-user@lists.linuxaudio.org

169 participants
129 discussions

by Martin Leese

On Thu, 2010-02-25 at 22:42 -0700, Bearcat M. Sandor wrote: ... > Am i correct in my > understanding, that nothing can be utilized by ambisonic processing > during playback if the source material is only stereo? Nope. Domestic Ambisonic decoders have a Super Stereo mode for "decoding" stereo sources. They also include a stereo width control which allows the stereo image to be compressed to mono-like or expanded into a horseshoe around the listener. See the Ambisonic FAQ on my website at: http://members.tripod.com/martin_leese/Ambisonic/faq_latest.html#SECTION10 The technical stuff is in the Ambisonia Wiki at: http://www.ambisonia.com/wiki/index.php/Super_Stereo Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/

14 years, 9 months

Re: [LAU] more than 4 channels for listening? Really?

by Martin Leese

Arnold Krille <arnold(a)arnoldarts.de> wrote: ... > I am thinking about adding a 5.1-to-ambisonics mixer/panner to move the > specialized channels with their defined positions to virtual sources in my > ambisonics surrounding. Don't know if that works out... If all you want to achieve is to move around your 5 virtual speakers then you are onto a winner. This is described at: http://wiki.xiph.org/Ambisonics#5.1_to_Ambisonics The problems come when you try to improve the 5.1. If you make assumptions about how the 5.1 was mixed then a little more can be done. See: http://www.ambisonia.com/wiki/index.php/5.1_surround#Using_a_UHJ_Transcoder Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/

14 years, 9 months

need advice for soundcard

by fred

Hi list, I'm planning to buy a good soundcard and like to have your opinions, if you please. The goal is to have 2 in, 2 out, MIDI, and maybe digital coax plugs. Full duplex, integrated DSP, ASIO2, latency "zero", 24bits/96kHz ability have to be there. Choice from now is M-audio Delta audiophile 2496, but your suggestions are really welcome !! Oh, forget to say it have to run under Linux ;-) Thanks for replies folks.

14 years, 9 months

A (mostly) Linux collaboration

by Folderol

This started out as a pleasant chord progression using just Rosegarden and ZynAddSubFX. However a friend of mine picked it up and created a melody for it and some guitar backing. He then made a rough mix for me to hear what he envisioned, and passed back the individual parts for me to produce the final recording, which was done in Audacity. Here it is. I hope you like it. http://www.musically.me.uk/music/Wandering.ogg -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

14 years, 9 months

post your workspace

by Josh Lawrence

hi list, I've been thinking about ergonomics a lot lately, and would like to see pics of your setup. my desk and chair are extremely uncomfortable - the desk is too high and the chair isn't soft. to make matters worse, I can't get to my keyboard easily, which sits in a L-shape to the desk. I keep thinking that a DIY solution with a laptop and a short stand might be more comfortable, and more productive. with that said, I'd like to see pics of your work area. have you done anything interesting to make it more enjoyable to make music with? if you use a MIDI controller of some sort, where do you put it? what kind of chair do you have? thanks all, -- Josh Lawrence http://www.hardbop200.com

14 years, 9 months

quips at ridiculous audio equipment

by James Morris

"The Clever Little Clock is a battery-powered travel clock that has been modified using a number of highly specialized techniques. More than 19 steps are necessary to produce the The Clever Little Clock, even more for the Signature version. The Clever Little Clock does not plug into the wall and has no influence on house wiring, audio components, cables, interconnects, power cords or acoustic waves in the room. Yet the Clever Little Clock has a pronounced affect on the sound in the room. In addition, the picture quality any video system will be improved - the video picture will be clearer, with better color saturation and contrast, with blacker blacks, more realistic skin tone and fabric texture, etc." http://www.machinadynamica.com/machina41.htm probably best visited with "NoScript" Firefox plugin enabled. They also provide a quantum teleportation service to achieve the same result, activated by calling them on your mobile!

14 years, 9 months

Re: [LAU] more than 4 channels for listening? Really?

by Martin Leese

Bearcat M. Sandor wrote: ... > So the speaker angle is more important than distance? It's the angles > relative to the listener, right? Right. > So a center channel is designed for > people who are sitting off axis and otherwise not needed? 5.1 was designed for movies playing in cinemas. One of the problems with cinemas is that the owners stuff in as many paying customers as possible. This means that many people end up off to one side sitting close a surround speaker. Because of this, the centre channel has to be used to lock the dialogue to the screen. So, yes, the centre channel of 5.1 was designed for people who are sitting off axis (or way in the back of the cinema). But this is not the only way a centre speaker can be used. If you wish, you can derive three new signals for L, C, R from two stereo input signals, and use the centre speaker to improve localisation even for on-axis listeners. One such system is called "Trifield", see: M.A. Gerzon, "Optimum Reproduction Matrices for Multispeaker Stereo", J. Audio Engineering Society, vol. 40 no. 7/8, pp. 571-589 (1992 July/Aug.) If you wish, you can record for three front speakers. See: M.A. Gerzon, "Microphone Techniques for 3-Channel Stereo", Preprint 3450 of the 93rd Audio Engineering Society Convention, San Francisco (1992 Oct. 1-4) A centre speaker is not *needed*, but it can be useful even for domestic on-axis listening. Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/

14 years, 9 months

sox: everything on the internet is wrong

by Ken Restivo

I was going to use sox for something, but I'm getting really angry. Sox's syntax is a notorious clusterfudge, so for the last 10 years ago I've been working off of recipies that I'd either figured out for myself or pulled off the internets. And I'd gotten accustomed to just Googling for whatever it is I wanted to so, and finding that someone had already navigated the nightmare of syntax to figure out how to do it in sox. No more. Something big and evil has changed in sox, and none of the recipes on the interents seem to work anymore. Example: I want to split a stereo JACK-compatible 32-bit float broadcast WAV file into two mono 32-bit float mono WAV files. Ohh kaaay... Somewhere on the internets, it says to do this: sox infile.wav outfile.l.wav remix 1 Um, no! sox soxio: Can't open input file `remix': No such file or directory Huh? "remix" isn't a file, you doofus, it's a command. OK, I look some more, and I find a totally different syntax to do the same operation: sox infile.wav -c 1 outfile.l.wav avg -l Wrong again! sox sox: Effect `avg' is deprecated; see sox(1) for an alternative Great, so I go see sox(1), and I search for "avg", and it's nowhere mentioned in the manual. If sox were a physical object, I would fling it out the window or smash it with my fist. Alas, it isn't, so the best I can do is rant here. And go looking for a different command line tool to replace sox with. -ken

14 years, 9 months

Re: [LAU] UA-101

by Ivica Ico Bukvic

On Sun, 2010-02-07 at 12:42 -0500, Ivica Ico Bukvic wrote: > Clemens, > > Sorry for taking this long to get back to this one. I am about to try > this thing out and am wondering if the latest version would be ok to try > out from the same URL > (http://ftp.kernel.org/pub/linux/kernel/people/tiwai/alsa/alsa-driver/) > or do I have to do use one from Dec. 14th 2009? > > Please advise. > > Best wishes, > > Ico BTW, I just tested the latest snapshot against rt-version of the 2.6.31 kernel (the one that comes with Ubuntu 9.10) with an UVC webcam patch (there is a bug in the original kernel regarding this), and the ua-101 now does not work at all. dmesg shows proper connects/disconnects of the hardware but no alsa module is loaded nor is it reflected in /proc/asound. I installed the driver from the aforesaid URL with configure/make/make install. No errors were reported. I also tried manually loading the module. No errors were reported during loading of the module yet no new devices showed up. I tried this both in lo and hi modes for all 8 channels of the soundcard. Any ideas? This definitely looks like a regression of some sort since before the soundcard was at least properly detected and producing sound. Best wishes, Ico

14 years, 9 months

octave effect?

by Josh Lawrence

hi! are there any ladspa plugins that can do an octave effect? I'm looking for something like a guitar pedal that doubles a note an octave down/up. thanks, josh -- Josh Lawrence http://www.hardbop200.com

14 years, 9 months

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Linux-audio-user February 2010