[opendtv] Re: Food for thought
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 17 Feb 2007 14:22:01 -0500
John Willkie wrote:
Now, you've got me confused, Mark.
It's an interesting quirk of fate.
NTC-7 is real. RS-250B and EIA-250C are real.
There was never any such standard as RS-170A. There certainly was an
RS-170 for monochrome TV, and there is agreement on what RS-170A would
have been, had there ever been one. But broadcasters did not want to
create an RS-170A until they were ready for it, lest the FCC adopt it as
part of the rules and they be fined for violating them.
So, instead, there is EIA IETS-1 (the first, and possibly only,
Industrial Electronics Tentative Standard), which specifies the
subcarrier-to-horizontal-sync relationship that everyone thinks comes
from the non-existent RS-170A.
TTFN,
Mark
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