[time-nuts] Holdover, RTC for Pi as NTP GPS source

Attila Kinali attila at kinali.ch
Sun Nov 12 10:35:36 EST 2017

Hoi Leo,

On Thu, 2 Nov 2017 21:45:56 +0000
Leo Bodnar <leo at leobodnar.com> wrote:

> I suspect delta-sigma body of knowledge can be applied almost wholesale to this seemingly silly oscillator concept. 
> Did I just repeat something trivial that has been discussed to death here before? 

Trivial? Yes. Well known? No. I know too many engineers who treat
delta-sigma modulators as kind of black magic and don't even want
to touch them. Yes, the math behind it is a bit intricate. There are
things that we cannot even calculate (only simulate), but a second
order D-S modulator will get you quite far and is easy to do.

If anyone wants reading material on that topic, let me know.

			Attila Kinali

You know, the very powerful and the very stupid have one thing in common.
They don't alters their views to fit the facts, they alter the facts to
fit the views, which can be uncomfortable if you happen to be one of the
facts that needs altering.  -- The Doctor

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