Re: alsa timer slippage

[Jan Depner <eviltwin69@cableone.net>]

Multiple soundcards usually have to use word clock or some proprietary
method of syncing the cards.  Usually one card will be the master and
the others slaves.  I know you can put up to 4 ST Audio DSP24 cards in
one system and set one up as master.  I believe the same is true for the
M-Audio Delta 1010.

As for having a bad timer on a system, I've worked a lot with realtime
systems and sometimes you just get a lemon.

Jan


On Sun, 2003-12-14 at 08:34, Chris Cannam wrote:
> On Sunday 14 Dec 2003 2:02 pm, Jan Depner wrote:
> > If I'm not mistaken the timing for your audio is coming from your
> > sound card not your system clock.
> 
> Is that so?  Obvious though it is, that simply hadn't occurred to me.
> 
> I mentally ruled out a hardware problem quite early on because I 
> wasn't seeing this problem when using a low-latency kernel on the 
> same hardware -- but maybe I just hadn't done enough testing with the 
> low-latency kernel.  I'll give it another shot.
> 
> The other points that brings to mind are, what if you have more than 
> one soundcard or no soundcard at all (only say USB devices)? and what 
> if the soundcard's just a chip on the motherboard, as mine is -- 
> wouldn't it get its own timing from the system clock?  It's plausible 
> that this crappy i810 could have a crappy timer, though this example 
> would be unusually crappy.
> 
> 
> Chris
> 




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