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

[Karl Hammar]

Folderol:
> On Sun,  8 Nov 2009 16:53:31 +0100 (CET)
> karl at aspodata.se (Karl Hammar) wrote:
...
> > Would a network connection solve that problem?
> > In that case the DACs and ADCs could reside on an embedded computer
> > and stream the sound data to/from the pc. And one could envision
> > such little things near each mic and ethernet cables or possible wifi
> > to the control room.
...
> Ethernet looks interesting, and I know there is stuff out there, but
> have no idea what latency and timing issues there may be. I would
> imagine syncing multiple 'drops' to a stable clock might be problematic.

Lets say we have pc <> switch <> lots of network boards for a single mic
PC could broadcast the clock to all micboards and the would hopefully
arrive without noticeable skew or jitter. And the micboards could
answer with that timestamp and the converted value. In this case
the PC requests each sample one at a time from all micboards.

Would that be good scheme?

A simple ping here, has a rund trip time of 0.25 to 0.8 ms depending
on end equipment.

Regards,
/Karl

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Karl Hammar                    Aspö Data               karl at aspodata.se
Lilla Aspö 148                                                 Networks
S-742 94 Östhammar          +46  173 140 57                   Computers
Sweden                     +46  70 511 97 84                 Consulting
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