[vorbis-dev] True surround sound for Ogg -- a proposal

[David Carter]

On Sat, Jul 28, 2001 at 02:01:41PM -0600, Anthony Arcieri wrote:
> > That will be harder to do -- Ambisonics relies heavily on the phases of
> > the various signals being correct.  With two cards running
> > simultaneously, their clocks would not be quite the same, and would
> > drift as the sound played
> 
> I believe the professional solution to this problem is an external DAC
> which connects digitally to a sound card.  I know my uncle who owns a
> recording studio has such a setup, 16-channel input to an external
> DAC which connects into a single sound card through what I believe
> was 4 Toslink channels (might've been AES/EBU, I don't remember exactly)

The RME Hammerfall card I mentioned (with 26 or 18 channels in and out,
depending on model) uses multichannel digital I/O (ADAT, IIRC), as well
as being able to take analog interface cards that provide a certain number
of analog I/Os (8 per card, IIRC).  It's a great deal if you have a studio,
not so great of one for the average user.  (These cards start around $650.)
More info at http://www.jdsound.com/rme_hammerfall.htm.  The ALSA sound
drivers support the Digi9652 and Digi9636 cards, I believe.


-- 
David Carter ** dcarter at sigfs.org ** dcarter at visi.com
PGP Key 581CBE61: E07EE199C767C752 8A8B1A9F015BF2EA
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