On Thu, 11 Dec 2003 10:06:03 +0000 (GMT)
Jim Lesurf wrote:

This may be the case if there is no mechanism in the receiver to adjust
its
medium/long-term clock frequency towards that of the transmitter.
However
the S/PDIF stream has clock info encoded into it.

Indeed. but we were discussing reclocking to a perfect clock, which
means the spdif clock is being replaced by one that is not even locked
to it, which will show the effects described (eventually)

Of course, if anyone owns such a system, I'll be happy to sell them a
'thermal clock recalibration and drift elimination tool' (aka, bunsen
burner and hotplate underneath), complete with soft rubber mouts and
counterweighted, balanced platform...

The above treats this as a matter of terminology. In reality, both the
transmitter and reciver clocks will wander about in an apparently
random manner over all timescales of variation. The object then is to
minimise these wanderings and their effects.

Indeed. of course, for the purposes of what I was explaining, its valid
to consider the transmitter clock as perfect and the other running fast
or slow (its the relative difference that matters :-)

I don't know if there is any official timescale defined in audio for
the longest term that is 'jitter' beyond which it becomes 'drift' of
'static error'. Hence I'd be inclined to regard these as all facets of
the same problem and treat them accordingly.

Agreed :-)

--
Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux

Do not meddle in the affairs of Dragons, for you are tasty and good with
ketchup.