Re: [LAU] What audio interface to use for a Linux-powered surround preamp?

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To: <linux-audio-user@...>
Date: Sunday, December 18, 2011 - 11:30 am

On 12/15/2011 02:59 AM, Johan Herland wrote:

out of curiousity, what is the benefit of upsampling? is there something
peculiar about power dacs that would make it useful or mandatory?

> - A HDMI switch with audio split (SPDIF) and RS-232 control.

hdmi to spdif means that you either get only two channels, or lossy
encoding. plus you will need to think about the clocking structure.
usually this will mean that your audio card will have to slave itself to
the incoming hdmi/spdif/whatever.

> - A suitable audio interface with at least 8 digital outputs.

tough one. there are a number of cheap options with ADAT, but you will
need two at 96k due to s/muxing, and four at 192k. for the latter, the
only option i know of is the rme raydat.
iirc, rme also has a card with native aes/ebu outs, and it should be
working ootb with the normal driver, but you may well find yourself to
be the only user ever of this card under linux. so be prepared to get in
touch with adi and get your kernel compilation toolchain ready :-D

the vendor is moderately linux-friendly, at least they are providing
specs and not actively making our lives harder than necessary. plus the
gear tends to be reliable and flexible.

> - Since this is still in a proof-of-concept phase, I'd like to spend

don't go for firewire. it's great for mobile use, but a) it's on the way
out, b) it requires a very carefully tuned low-latency system, and c) it
totally does not work with frequency scaling and you will burn a quarter
of the available cpu cycles just to get the audio data in and out.
pretty deadly for an embedded and possibly passively cooled system.

> - Focusrite Saffire PRO 40 (seems similar to RME Multiface II, but

it is well supported, but see above.

> What other audio interfaces should I check out? Are there other things

unfortunately, the only answer for truly professional audio hardware
under linux is rme. not that their gear is bad, but it sure is
expensive, and i wonder what we're going to do if they ever turn evil...
time for those open hardware projects...
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Messages in current thread:
Re: [LAU] What audio interface to use for a Linux-powered su..., Jörn Nettingsmeier, (Sun Dec 18, 11:30 am)
Re: [LAU] What audio interface to use for a Linux-powered su..., Jörn Nettingsmeier, (Mon Dec 19, 10:14 am)
Re: [LAU] , gene heskett, (Mon Dec 19, 11:19 pm)
Re: [LAU] , gene heskett, (Tue Dec 20, 11:24 pm)
Re: [LAU] , gene heskett, (Wed Dec 21, 3:52 am)
Re: [LAU] , gene heskett, (Wed Dec 21, 3:24 pm)