19 Feb
2012
19 Feb
'12
12:27 p.m.
Sorry to reply to such an old topic, going through my Linux Audio folder for the first
time in a few months (been to busy to keep up lately.)
I hope things have progressed nicely :-)
For audio I would also have suggested RME. It looks like you have chosen to go one of the
fully digital routes, to get all the AES you need straight out of the card. If you had
really wanted some analogue options alongside it then RME do ADAT<->AES converters,
so could have been used with one of the more general purpose cards with ADAT.
http://www.rme-audio.de/en_products_adi_4_dd.php
As to video. There are some HDMI capture cards available, EG Black Magic if on a tight
budget, but from a quick reading it seems they all only support the baseline of 2 channel
audio on HDMI, rather than the possible 8 channels.
A solution could be to use a HDMI->HDSDI converter, although being broadcast equipment
generally not cheap, but these can be found supporting the full 8 channels and HDSDI
ingest cards will generally support all 8 channels too.
Converter (they also do cards but couldn't find one suitable for you.)
http://www.dveo.com/broadcast-systems/HDMI-to-HD-SDI-converter.shtml
For professional video cards DVS and Deltacast seem to have good Linux support, Black
Magic to a lesser degree (and they're really prosumer at best.)
http://www.deltacast.tv
http://www.dvs.de
Neither has an off the shelf product that will help with HDMI ingesting but still may be
worth looking at/talking to.
Or maybe all Black Magic need to do is a firmware update for the Intensity or Deklink
Studio HDMI input cards . http://www.blackmagic-design.com/products/intensity/ &
http://www.blackmagic-design.com/products/decklink/
Or has the HDMI switch done away with the need for a lot of this? I
would of used a basic switch, which are available cheaply, then into the
computer using one of the above methods...
Good luck with it all anyway.
Dale.
From: gheskett(a)wdtv.com
To: linux-audio-user(a)lists.linuxaudio.org
Date: Mon, 19 Dec 2011 20:21:12 -0500
Subject: Re: [LAU] What audio interface to use for a Linux-powered surround preamp?
On Monday, December 19, 2011 07:50:53 PM Johan Herland did opine:
List only reply..
On Tue, Dec 20, 2011 at 00:19, gene heskett
<gheskett(a)wdtv.com> wrote:
TBT, I am a bit hardware oriented, and I base that statement on reading the
data sheets on what look to be interesting bits of smart sand I have found
links to.
As I am not privy to what chip is on audio card x, at any one week n, I
think to actually name names & model numbers (something else I have learned
to miss-trust, dealing with ATI's video cards, which can get changed at
about the same rate we change underwear, can be exceptionally educational)
is generally pretty frustrating. So other than the card I presently use, I
won't give any name, rank or serial numbers. Why? Ears are at least as
variable as eyeballs. My eyes for instance, have had glass in front of
them for the last 71 years. My color vision OTOH, is very very good.
I don't claim to have ears that matched Larry Klien's when he was doing all
his pundrity in the audiofile rags 30 years ago, but at my age, I think
they are generally not lying to me when I listen to something for several
hours, with a rather eclectic mix of music, and do not get tired of it.
Toss in a bit of digital aliasing, a bit of monotonicity errors, then add a
3rd order intercept of 40db or less for the two tone so the net total
distortion approaches .5%, and these old ears are screaming for some
silence in 5 to 10 minutes.
However, I have been amazed at the number of folks out there who can listen
to 5% THD and a 20 db intercept on a two tone signal, with a bit of
aliasing thrown in, and absolutely cannot hear it, the difference to them
is a total shrug. It boggles my mind to think of what they are missing.
OTOH, given the class of folks who seem to inhabit this list, I think there
are some altogether decent ears here. Your tastes in music might assault
me, and mine would yours I'm equally sure, but the technical ability I hear
in most of the samples posted so far is far better done than the average
garage band console can pass. You are being 'picky' and for that I salute
you all. Technically, the state of the art in making music seems to
continually improve. And its people like you that are part of that driving
force behind that.
Thanks for reading this far. I'll get me coat now.
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene>
We will have solar energy as soon as the utility companies solve one
technical
problem -- how to run a sunbeam through a meter.
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On Monday, December 19, 2011 06:16:06 PM Fons
Adriaensen did opine:
Is this on pure digital devices (where you should expect bit-perfect
results)?
Are you claiming that manufacturers in practice don't meet the specs
listed for their devices?
Does this seem like a trend, or are there just some interfaces with
bugs out there?
Are some brands notoriously worse than others?
(just curious, since one wouldn't want to buy crappy equipment)
Have fun! :)
...Johan
Be very careful with what you read on
'audiophile' forums. 99% of the
high-end audio business is based on ignorance and hype these days.
Chuckle. آ I have to disagree a wee bit Fons, you under-estimate the
percentage that is all smoke and mirrors, its at least 99.9% these
days. :)
Lots of card claim 24 bit, but a monotonicity check will often fail
before the 14th bit has been fully tested.