Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!sun-barr!sun!imagen!atari!portal!cup.portal.com!FelineGrace
From: FelineGrace@cup.portal.com (Dana B Bourgeois)
Newsgroups: comp.sys.amiga.tech
Subject: Re: TICK and J300
Message-ID: <18978@cup.portal.com>
Date: 31 May 89 01:11:31 GMT
References: <3319@hplabsz.HPL.HP.COM> <6854@cbmvax.UUCP> <286@xdos.UUCP> <213@doctor.Tymnet.COM>
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Organization: The Portal System (TM)
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Joe Smith would like a crystal clock that adjusts itself long-term from
the power line which makes a good long-term time standard but relatively
poor short-term one.  I like the idea but I'm not sure conceptually how
you would design this.  At any instant the power line time interval will
be long or short.  When do you decide to 'sync' up to it? Or maybe you
sample the intervals over a week, take the average and set your crystal
frequency to that?  Or sample over a 30 hour period since the power
companies supposedly average over a day?  How many samples?  Anybody
have an idea of how to design this?

Dana