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From: OLE@SRI-NIC.ARPA (Ole Jorgen Jacobsen)
Newsgroups: net.video
Subject: Re: video standards
Message-ID: <12190726378.23.OLE@SRI-NIC.ARPA>
Date: Fri, 14-Mar-86 17:20:02 EST
Article-I.D.: SRI-NIC.12190726378.23.OLE
Posted: Fri Mar 14 17:20:02 1986
Date-Received: Sat, 15-Mar-86 22:38:22 EST
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Lines: 23

Richard,
	The number of lines is definately part of the standard, all PAL
systems are 625, there is (was?) supposedly an 819 line SECAM system
(all the common ones are 625), while all NTSC systems are 525. The old
British standard (black and white) used 405 lines, this has now been
phased out.

	What does vary within each standard is the *broadcast* format,
that is distance between sound and picture carrier, frequency band
used, type of modulation (AM/FM).  Look in "World Radio TV Handbook"
(the DXers best friend!) for more details.

	Look at MRCs message on the Instant replay machine regarding how
to do PAL on a NTSC system in a kludegy way.


	HDTV, digital TV or whatever wins in the end will most likely
not be backwards compatible, but assuming the world can agree we will
only have *one* standard and not umpteen.


Ole
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