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

Hans Wilmers hanswil at notam02.no
Wed Nov 11 17:27:55 EST 2009

On Wed, 2009-11-11 at 21:33 +0100, Giso Grimm wrote:
> Maybe I am something missing, but what about the clock synchronization?
> It would be nice to allow synchronization of several devices via the
> network connection. This transport medium typically has a lot of jitter
> (even an unloaded gigabit system can be above 50µsec), however, the
> jitter of typical AD/DA converters should be in the order of
> nanoseconds. And in the case of several devices, how is it possible to
> compensate the absolute delay? All devices should be in phase, with a
> deterministic inter-device delay.
Yes, that's a real problem. I don't see a solution to that either.

> If it is only a single device it should be possible to use netjack: Then
> it behaves as a small host with its own sound card, and running jack
> with netjack_client (or whatever it ins called in recent versions). Any
> remote PC can run jack with the net backend to connect. Well, with
> netjack for jack0.116.2 the connection request is made from the other
> direction, in this case the open sound card, but connect requests could
> be triggered via OSC. And Netjack2 for jack2 seems to work completely
> differently.
I guess that jack is too big a burden for the small kind of system we
are talking about, so the question is, if netjack could be implemented
standalone - or maybe another suitable mechanism?

/ Hans

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