Re: [LAU] open hw soundcard (was Re: status usb2 for sound)

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To: <linux-audio-user@...>
Date: Friday, November 13, 2009 - 11:22 pm

On Fri, 13 Nov 2009 23:42:31 +0100
fons@kokkinizita.net wrote:

> On Fri, Nov 13, 2009 at 10:15:15PM +0000, Folderol wrote:

Ah! I wasn't aware of that. It's not a point that is exactly made
obvious - I wonder why?

> > need to think out

OK. That makes sense. So our single multi-channel network soundcard
should also provide the timing for the computer (rather like an
internal soundcard does). This takes all, well most, of the precision
out of the computer, which is something I like the idea of. With the
appropriate network-jack driver (which would be hardware agnostic) it
can be used with just about any machine.

Looking up the AES spec quickly reveals 48kHz +/- 10ppm. If the
card's master oscillator has that kind of stability, it would surely
require only very tiny slow adjustments to keep two of them in sync.
Worst case would be them consistently drifting the maximum allowance in
opposite directions, which if my maths is up to scratch results in
about a second before they would actually get out of step by 1 cycle.

A quick google reveals 5ppm temp compensated oscillators with a a 7ppm
voltage controlled pull-in - no idea how much these cost though.

--
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.
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Messages in current thread:
[LAU] status usb2 for sound, Hartmut Noack, (Thu Nov 5, 9:06 am)
Re: [LAU] status usb2 for sound, Paul Davis, (Thu Nov 5, 2:45 pm)
Re: [LAU] status usb2 for sound, Lorenzo, (Thu Nov 5, 3:07 pm)
Re: [LAU] status usb2 for sound, Jörn Nettingsmeier, (Thu Nov 5, 3:40 pm)
Re: [LAU] status usb2 for sound, Hartmut Noack, (Thu Nov 5, 10:40 pm)
Re: [LAU] status usb2 for sound, Jörn Nettingsmeier, (Fri Nov 6, 9:19 am)
Re: [LAU] status usb2 for sound, Florian Faber, (Fri Nov 6, 9:28 am)
Re: [LAU] status usb2 for sound, Arnold Krille, (Sat Nov 7, 10:05 am)
Re: [LAU] status usb2 for sound, Ken Restivo, (Sun Nov 8, 7:49 am)
Re: [LAU] status usb2 for sound, Karl Hammar, (Sun Nov 8, 12:02 pm)
Re: [LAU] status usb2 for sound, Folderol, (Sun Nov 8, 2:46 pm)
Re: [LAU] open hw soundcard (was Re: status usb2 for sound), Folderol, (Fri Nov 13, 11:22 pm)
Re: [LAU] open hw soundcard, Karl Hammar, (Fri Nov 13, 5:10 pm)
Re: [LAU] open hw soundcard, Karl Hammar, (Fri Nov 13, 4:43 pm)
Re: [LAU] status usb2 for sound, Patrick Shirkey, (Sun Nov 8, 8:13 am)
Re: [LAU] status usb2 for sound, Florian Faber, (Sat Nov 7, 9:15 pm)
Re: [LAU] status usb2 for sound, Hartmut Noack, (Sat Nov 7, 11:06 am)
Re: [LAU] status usb2 for sound, Paul Davis, (Sat Nov 7, 6:47 pm)
Re: [LAU] status usb2 for sound, Hartmut Noack, (Sat Nov 7, 11:40 pm)
Re: [LAU] status usb2 for sound, Arnold Krille, (Sat Nov 7, 2:14 pm)
Re: [LAU] status usb2 for sound, Clemens Ladisch, (Fri Nov 6, 7:53 am)
Re: [LAU] status usb2 for sound, Ivica Ico Bukvic, (Sat Nov 7, 3:08 am)
Re: [LAU] status usb2 for sound, Clemens Ladisch, (Tue Nov 10, 1:57 pm)
Re: [LAU] status usb2 for sound, Arnold Krille, (Thu Nov 5, 11:38 pm)
Re: [LAU] status usb2 for sound, Martin Homuth-Rosemann, (Fri Nov 6, 6:55 pm)
Re: [LAU] status usb2 for sound, Dominic , (Sat Nov 7, 5:48 pm)
Re: [LAU] status usb2 for sound, Martin Homuth-Rosemann, (Sun Nov 8, 3:54 pm)
Re: [LAU] status usb2 for sound, Dominic , (Mon Nov 9, 12:20 am)
Re: [LAU] status usb2 for sound, david, (Sat Nov 7, 9:11 pm)
Re: [LAU] status usb2 for sound, Giso Grimm, (Thu Nov 5, 3:01 pm)