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From: albert@ucbvax.ARPA (Anthony Albert)
Newsgroups: net.video
Subject: Re: How to calibrate mechanical counters on VCRS
Message-ID: <9281@ucbvax.ARPA>
Date: Tue, 23-Jul-85 17:42:24 EDT
Article-I.D.: ucbvax.9281
Posted: Tue Jul 23 17:42:24 1985
Date-Received: Thu, 25-Jul-85 07:17:04 EDT
References: <433@zinfande.UUCP> <20600018@hpcvry.UUCP> <709@lsuc.UUCP>
Reply-To: albert@ucbvax.UUCP (Anthony Albert)
Organization: University of California at Berkeley
Lines: 23

In article <709@lsuc.UUCP> msb@lsuc.UUCP (Mark Brader|LSUC|Toronto) writes:
>
>This will work if you have a tape counter that counts revolutions
>	t = (c^2)/A + c/B
>
>and the inverse formula is
>
>	c = sqrt(K^2 + A*t) - K    where    K = A/(2*B)
>
>We want to find the values of A and B for the particular tape and the
>particular VCR.  
>
>Now make a continuous recording over the whole length of the tape you want
>to calibrate.   If you have, say, a cable channel which continuously displays
>the time of day, use that. ...

One thing to be careful of is that the counters might give different
values during FF and REW than during play and record. At least that
has been my experience.
-- 
				Anthony Albert
				..!ucbvax!albert
				albert@ucbvax.ARPA