Article View: comp.sys.dec
Article #1687Re: ds3100 gives me a headache
From: Satish Chittamuru
Date: Fri, 06 Jul 1990 14:28
Date: Fri, 06 Jul 1990 14:28
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1846 bytes
In article <6118@helios.ee.lbl.gov> envbvs@epb2.lbl.gov (Brian V. Smith) writes:
Perhaps you mean fluorescent lights (not neon)? The reason that many
(all, in the past) crts use 60Hz refresh rate is to CANCEL the effect of
any interference caused by fluorescent lights. If the refresh rate is
different than that of the lights, then you get beat frequencies of the
difference of the two rolling down your monitor.
That is true. If the frequencies are different, then you do get a beat
frequency. But even if the frequencies are the same, but are out of
phase, then too you would get a flicker. By itself it may not be
noticeable, but when you combine it with the fact that a CRT blanks
the screen on a vertical retrace, that could be significant. That
could be reason for the noticeable flicker.
Any comments on that?
--
-Satish K. Chittamuru
chittamu@cs.umass.edu Software Development Lab.
chittamu@umass.bitnet Dept. of Computer & Info. Sciences
University of Massachusetts
Amherst, MA 01002
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Path: arc1-ca.pugleaf.net!utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!psuvax1!rutgers!mit-eddie!media-lab!snorkelwacker!bu.edu!xylogics!transfer!crackers!m2c!umvlsi!dime!dime.cs.umass.edu!chittamu From: chittamu@dino.cs.umass.edu (Satish Chittamuru) Newsgroups: comp.sys.dec Subject: Re: ds3100 gives me a headache Message-ID: <CHITTAMU.90Jul6102850@dino.cs.umass.edu> Date: 6 Jul 90 14:28:50 GMT References: <DAVIS.90Jul5122923@pacific.pacific.mps.ohio-state.edu> <LEE.90Jul5152350@quincy.cs.umass.edu> <6118@helios.ee.lbl.gov> Sender: news@dime.cs.umass.edu Distribution: comp Organization: University of Massachusetts at Amherst Lines: 24 In-reply-to: envbvs@epb2.lbl.gov's message of 5 Jul 90 21:55:15 GMT