[opendtv] Re: News: No Motive for HDTV Rollouts
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 27 Jun 2004 19:40:51 -0400
Tom Barry wrote:
> I think it is only the ATSC HD standard that has a high def, a low
> def, and not much in between. AFAIK, broadcasters have pretty much
> stuck to 480i, 720p, and 1080i for some reason.
Actually, Tom, ATSC can transmit 480p, wide or narrow screen, which
is certainly between HDTV and SDTV. In addition to this, with
prefiltering, ATSC can transmit any bit rate it wants for any
program stream you care to transmit. Which is another way to
control quality, even within the confines of Table 3. (This would
be analogous to an FM station transmitting with lower dynamic
range, to restrict its use of spectrum.)
> Personally I
> think resolution should vary instantly and continuously based
> upon the
> channel capacity and the possible benefits offered by the source.
> Stat muxing re-encoders should be able to change them on the fly.
Agreed. With the broadcasters now showing interest in multicasts,
I don't know how this sort of instantaneous quality adjustment can
be avoided.
Bert
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