[opendtv] Re: Micronas Delivers World's Smallest Digital TV Demodulator
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 17 Jan 2007 10:39:44 -0500
Dale Kelly wrote:
> Current ATSC design might possibly now have equaled
> that benchmark but where is the hardware?
I'd love to see good comparison tests now, as you know. Doubtful that
will ever happen, unless some individual does it on his own.
> The impulse noise argument at this late date is bogus; it
> was mostly an early generation receiver issue that was
> addressed and will clearly be of no importance once
> transmitter power is increased.
Dale, it's not bogus at all. It is caused by the fact that DVB-T elected
not to use an inner interleaver. Meaning, the interleaver after the RS
encoding step. DVB-S uses one, DVB-T does not. Of course, increasing
power or reducing spectral efficiency will alleviate the problem, as it
alleviates any other reception problem.
Impulse noise is not an issue with ATSC, as far as I can tell, even for
my very marginal channels. I notice no extra vulnerability to impulse
noise when my signal monitor shows weak signal and low C/N.
I trust that had the US switched to COFDM, we would have specified the
inner interleaver *and* we would have specified MPEG-2 MP at HL.
> Regarding your assertion that the selection of COFDM
> would have slowed the OTA transition even more in the U.S.
Not what I said. I said that I don't buy the reasoning any longer that
COFDM would have sped anything up. I might have bought that three years
ago, but no more.
If everyone was truly interested in speeding up the transition, they
would not have delayed introduction of 4th and 5th gen products this
long. I have never seen anything take this long to get to market. The
old refrain makes no sense.
Bert
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