Re: How does digital TV broadcast prevent ghosting effects?

On a sunny day (Mon, 26 Nov 2007 21:01:15 GMT) it happened mzenier@xxxxxxxxxx
(Mark Zenier) wrote in <fihmav$bar$1@xxxxxxxxxxxxxxxxxxx>:

The stuff I remember (vaguely) was greatly refreshed by reading
<http://www.atsc.org/history.html> and the related pages on the
"Grand Alliance" and "FCC adopts...". They started with this
in the late 1980's, came up with several systems around 1991 and
combined the results into the standard by 1995.

They lost (against politics).

I'm pretty sure that nobody had put up anything but a test transmitter
by then. I think some groups thought that they could lobby their way
around it as COFDM got better developed after 1995.

You also have to remember that in the decentralized US broadcast
industry, signal quality is a competitive tool. (Or used to be,
now that most everybody uses cable or satellite).

Mark Zenier mzenier@xxxxxxxxxx
Googleproofaddress(account:mzenier provider:eskimo domain:com)

Yes, I have just read the links you mentioned.
Sure, in 1999 50% had access to ATSC transmissions.
Also this 50% experienced severe multipath problems.
The broadcasters, being 'competitive' did not really want to
lose viewers, and voices were hears (Sinclair for example) to
change to COFDM.
Of course the 'standard' was set, and it was a bit late to change.
As many had invested time and money in ATSC.

Cases like Joerg's show that sort of ignoring the problem is
no solution, what can he do?

It somehow reminds me of NTSC (we say Never Twice Same Color),
it was a new system, but it had flaws, it was not a bad system,
but sold with the flaws,
Maybe US should have been a bit more humble and review things in 1998,
as then COFDM results were also known.

I mean, ask yourself, IF US had known about PAL's line alternating phase,
WOULD it have adapted such a thing and not NTSC?

There are pride and ego and politics and money at work.
'We can always improve it later (can we?) and sell a new set'
guarantees continuous income for the industry.



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