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Article #962Re: Electronic Pest Control
From: Isaac S Wingfield
Date: Tue, 25 Jul 1989 06:04
Date: Tue, 25 Jul 1989 06:04
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David Borowski writes: I don't normally correct but! tv horizontal scan is 15750 HZ 30*525 scan lines Well, actually, this is correct for B&W only, and we don't get much of that any more... The horizontal scan rate for NTSC color is 15734.26 Hz or thereabouts. The vertical rate is 59.94, and both are exact submultiples of the color subcarrier, at 3579545 Hz. The reasons for this have to do, at least partly, with attempts to minimize interference between video and audio by controlling the video signal spectrum. By locking everything together, most of the energy is in a "comb", and the sound subcarrier fits neatly in between. Regards, Isaac isw@cup.portal.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!ctrsol!ginosko!uunet!portal!cup.portal.com!ISW From: ISW@cup.portal.com (Isaac S Wingfield) Newsgroups: sci.electronics Subject: Re: Electronic Pest Control Message-ID: <20728@cup.portal.com> Date: 25 Jul 89 06:04:22 GMT References: <12726@well.UUCP> <6591@cognos.UUCP> Distribution: na Organization: The Portal System (TM) Lines: 20