[NUT-devel] Broadcasting nuts [PATCH]

Rich Felker dalias at aerifal.cx
Wed Feb 6 19:17:43 CET 2008


On Wed, Feb 06, 2008 at 07:02:11PM +0100, Michael Niedermayer wrote:
> > A clock this bad would drift by 1/4 an hour per day. I doubt anyone
> > would buy such a clock...
> 
> No, but people buy various embeded devices to watch videos and their clocks
> are supposed to be cheap. And while i dont think they would be off by
> 15min/day i doubt you can expect more than 1min/day accuracy from them.

FWIW, this matches the estimates in my other email of 0.1% error.

Also, maybe this is getting OT, but truely "broadcast" (in the sense
of airwaves being involved) applications have a matched-to-sender
clock pulse already via the PLL or whatever similar circuits they use
in the tuner equipment.

Incidentally, at least as I understand it, PLL itself works on a
concept similar to what I described, consisting of local clock
(oscillator) plus adjustments from the input signal, and operating
without a separate reference clock source.

Rich



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