Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!att!mcdchg!ddsw1!corpane!sparks
From: sparks@corpane.UUCP (John Sparks)
Newsgroups: sci.electronics
Subject: Re: Converting PAL to NTSC on the fly
Summary: some corrections
Message-ID: <893@corpane.UUCP>
Date: 14 Jul 89 14:49:34 GMT
References: <15315@pasteur.Berkeley.EDU> <10350003@otter.hpl.hp.com>
Organization: Corpane Industries Inc., Louisville, KY
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<2825167777@Lewis.Steinmetz> <918@anise.acc.com>
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In article <918@anise.acc.com> lars@salt.acc.com (Lars J Poulsen) writes:
>(3) Interlace versus non-interlace scan.
>    Broadcast video is usually interlaced to reduce flicker, computer

Interlacing does not reduce flickering, it increases it. The interlacing is to
allow higher resolution with out having to have expensive hardware. The 525
lines in NTSC are divided up into even and odd lines. The even lines are sent
in one frame and the odd in the next. This increases flicker in high contrast
situations and in places where some object is only one scan line thin on the
screen. There are new TV's called IDTV's that de-interlace the signal and show
the entire 525 lines, at 60Hz. They have less flicker than standard TV, but
they suffer from motion artifacts.
-- 
John Sparks   |  {rutgers|uunet}!ukma!corpane!sparks | D.I.S.K. 24hrs 1200bps
|||||||||||||||          sparks@corpane.UUCP         | 502/968-5401 thru -5406 
As far as we know, our computer has never had an undetected error.