[opendtv] Re: Post on alt.tv.tech.hdtv of interest today
- From: "John Willkie" <JohnWillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 6 Apr 2005 20:31:07 -0700
Yeah, like Bob and Pat are on the same planet.
John Willkie
----- Original Message -----
From: "Ron Economos" <k6mpg@xxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, April 05, 2005 2:41 AM
Subject: [opendtv] Re: Post on alt.tv.tech.hdtv of interest today
> The ATSC TSG/S6 group is actively working on
> H.264 and VC-1. Maybe you should contact
> Pat Wadell of Harmonic/Divicom to avoid duplicated
> efforts?
>
> Ron
>
> Bob Miller wrote:
>
> >Manfredi, Albert E wrote:
> >
> >
> >
> >>Bob Miller wrote:
> >>
> >>
> >>
> >>
> >>
> >>>BTW I am still having my calls to broadcasters returned.
> >>>
> >>>Key interest seems to be the need for MPEG4 and receiver
> >>>standards which then opens the door to consideration of
> >>>looking at modulation.
> >>>
> >>>
> >>>
> >>>
> >>Interesting to see if this leads to anything. My inclination would be to
"pick your battles," so you don't end up turning everyone off by asking for
things they cannot give you.
> >>
> >>
> >>
> >>
> >The hearing priorities are first to address receiver standards and to
> >see if they would be addressed by any Congressional converter
> >distribution program. Second would be the issue of MPEG4. If that
> >becomes a front burner issue then that opens the door to a discussion of
> >modulation. If we are going to change to MPEG4 we might as well look at
> >all possible modulations or even a non-compatible version of 8-VSB since
> >all receivers would be made obsolete by a conversion to MPEG4.
> >
> >I think from those I have talked to that the receiver issue and
> >especially MPEG4 are key.
> >
> >
> >
> >>As to inkyblacks' rant,
> >>
> >>1. A US version of COFDM should certainly include the optional inner
interleaver, to correctly solve the impulse noise problem. No reason to do
something wrong if you're starting from scratch.
> >>
> >>
> >>
> >>
> >All modulations currently in use or proposed should be considered
> >including ISDB-T.
> >
> >
> >
> >>2. A US version of COFDM should also mandate that all receivers be
capable of receiving SD, ED, or HD streams, to avoid the simulcast
requirement of other COFDM countries. And might as well include H.264 while
you're at it.
> >>
> >>
> >>
> >>
> >Obviously all receivers should be capable of 1080P, I don't understand
> >why France chose to go with MPEG2 for their FTA while allowing MPEG4 on
> >pay channels at this late date.
> >
> >
> >
> >>3. The bit about bandwidth required by COFDM vs 8-VSB is perhaps not
entirely justified. I think Mark Schubin indicated that the FCC aloowed the
slightly wider COFDM 6 MHz spectrum. Maybe this is because while 8-VSB
channels are down 50 dB at +/- 1 Mhz of the 0dB level of the spectrum, the
dropoff of 8K COFDM is steeper. So in essence, COFDM even with 5.71 MHz
bandwidth might be no
> >>wider by the 30 dB point than 8-VSB is with 5.38 MHz of bandwidth.
That's what the spectra seem to indicate.
> >>
> >>Before settling on any new modulation scheme, though, I'd rather see a
performance spec be written. And a meaningful one, not one obviously loaded
to give a predetermined answer. My spec would include relatively long range
indoor reception of full power UHF signals,
> >>for example, which would *really* make OTA easy for users to set up.
> >>
> >>
> >>
>
>
>
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