Re: [LAD] embedded high end audio

On Sat, Aug 02, 2008 at 01:01:12PM +0200, Pieter Palmers wrote:
> Florian Faber wrote:
> > Peter,
> >
> >> I doubt that it is easy over a transport protocol that doesn't have a
> >> global absolute time reference (like ethernet).
> >
> > What time reference do you have in mind on ethernet that can be used as
> > word clock source?
>
> My formulation is a bit unfortunate. I mean that ethernet does NOT have
> a global absolute time reference. And word clock is not a time
> reference. It's a 'rate' reference, which does not contain absolute time
> information. What you need to output signals on different devices with
> sample accurate phase is an absolute time reference. Which ethernet does
> not have.

The solution I'm using in this case is to distribute
a single audio signal (similar to the one used in jdelay)
to all computers. The signal can be decoded into a sub-
sample accurate time, and all network data are timestamped
using this time scale.

Ciao,

-- 
FA
Laboratorio di Acustica ed Elettroacustica
Parma, Italia
O tu, che porte, correndo si ?
E guerra e morte !
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