Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83 (MC840302); site ecrcvax.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!think!harvard!seismo!mcvax!unido!ecrcvax!snoopy From: snoopy@ecrcvax.UUCP (Sebastian Schmitz) Newsgroups: net.followup Subject: Re: monitor whine Message-ID: <119@ecrcvax.UUCP> Date: Fri, 5-Jul-85 11:23:28 EDT Article-I.D.: ecrcvax.119 Posted: Fri Jul 5 11:23:28 1985 Date-Received: Sun, 7-Jul-85 06:14:01 EDT Organization: ECRC, D-8000 Muenchen 81, W. Germany Lines: 64 Summary: Expires: References:Sender: Reply-To: snoopy@ecrcvax.UUCP (Sebastian Schmitz) Followup-To: Distribution: Organization: European Computer-Industry Research Centre, Munchen, W. Germany Keywords: I have found that this varies from monitor to monitor i.e. just keep swapping till you find one that does not whine. It is annoying though. "Normal" TV's do the same: I can usually walk out on the street underneath peoples windows and tell you who has his TV turned on or not just by hearing the whine (and not the soundtrack). Well I may have bats ears but it is annoying. Incidentally the whine you hear is the flyback transformer which means you either hear the very annoying aprox. 18.5 KHz tone or subharmonics thereof (which are less annoying but usually louder). I remember that some years ago there was plenty of discussion on net.works if one should not pressurise manufacturers to do something against this whine. This would be another big point on the "our monitors have such lovely ergonomics list". There would be a BIG market, I think... So anyone building monitors please take note of this. I think that headaches people get using CRT's are not due to eye strain but rather due to the sound... /* this is true probably because high pitched sound can cause intense pain in the inner ear. This principle is used by a US Army "sentinel robot", which prowls by the side of military fences, looks at you with its infrared sensors and orders you to stop whatever you are doing or else. The "or else" means it will flash at you with a megawatty flash gun (to blind you, duuhhh) and if you run/stumble away it will come after you at up to 30 m.p.h. and will irradiate the surroundings with "a high frequency sound source which causes intense pain in the inner ear." In other words if you have not been scared shitless up to now, nows the time ! The article further claimed that so far there "were no plans to equip the robots with any lethal restraints". I don't know where this was published but it was some year or so ago on the last page of some electronic news magazine (could have been BYTE even). This last page was a sort of "last minute news" section. However I believe my quotes to be accurate and if anyone remebers the magazine please mail me the reference */ Perhaps someone can investigate this more formally (i.e. put a bunch of summer students in a terminal room, let them bash out memos of highly naive/political content to inapropriate newsgroups and bombard them with high frequency sound and plot typing error frequency against noise pitch/intensity. ;-) ) Happy whining and dining :-) /* groan - someone get me off the net !*/ love, -- Love, Sebastian (Snoopy) "You haven't done it, till you've done it with pointers" \!mcvax\!unido\!ecrcvax\!snoopy /* N.B. valid csh address */