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Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!usc!apple!vsi1!sat!lmb
From: lmb@sat.uucp (Larry Blair)
Newsgroups: misc.consumers,sci.electronics
Subject: Re: Cable Competition at Last!
Keywords: Direct Broadcast Coming Soon
Message-ID: <1991Jan28.233301.11129@sat.uucp>
Date: 28 Jan 91 23:33:01 GMT
References: <1991Jan25.140848.24260@kodak.kodak.com> <1991Jan25.165057.671@ux1.cso.uiuc.edu> <15129@milton.u.washington.edu>
Distribution: na
Organization: SAT, Sunnyvale, CA
Lines: 21

In article <15129@milton.u.washington.edu> gwangung@milton.u.washington.edu (Roger Tang) writes:
=In article <1991Jan25.165057.671@ux1.cso.uiuc.edu> mas35638@uxa.cso.uiuc.edu (Odin) writes:
=>> 480 lines
=>
=>525 is standard.  You're talking about a picture which is not as
=>good as normal tv broadcasts.
=
=	????
=
=	Last time I heard, broadcast quality was nowhere near 525 and, in fact,
=many midline TVs don't get this even from direct video connections.

The actual video in an NTSC signal consists of 485 lines (actually 484 plus
two half lines).  The entire signal is 525, so there are 2 ways to look at it.
While most sets won't display all 485 lines, they sure as hell have to handle
them, since they're going to have a horizontal sync pulse coming at them for
each of those 525 lines.


-- 
Larry Blair  apple!sat!lmb    lmb%sat@apple.com