[time-nuts] lunatic fringe time standards

Eugen Leitl eugen at leitl.org
Thu Apr 15 11:07:29 UTC 2010

On Thu, Apr 15, 2010 at 02:48:58AM -0700, Hal Murray wrote:

> I'm not aware of anything like I think you are describing.
> What problem are you trying to solve?
> The main reason that I think of using gray codes is for crossing clock 
> domains.
> But as Magnus pointed out, another possible problem is just counting at high 
> speeds.

I was idly musing about how to reliably count an integrated solid-state
THz oscillator adjacent to a (very wide) counter. The problem is due 
of relativistic signal delays which are in the ballpark of counter
feature size. A way to circumvent that is to keep relevant state changes
to the oscillator lightcone. Hence Gray codes with local bit flips,
or something similar.

The compensation for drift and e.g. relativistic (spacetime curvature
and motion) effects would happen by directly applying small numerical
deltas to the ALU downstream of the counter. The result would be a
clock directly compensated against movement and position in a gravitation

Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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