[opendtv] Re: Brazil
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 18 May 2006 11:02:27 -0400
John Shutt wrote:
> I can't wait to read DVB's rebuttal.
Simple: these tests are way obsolete. Check when the tests took place.
> The interesting thing was even in the fixed
> modes, ATSC's C/N advantage did not result in
> better far field reception. Must have been
> an earlier generation ATSC chipset,
Do you think? Like, first gen receivers?
The interesting thing I learned from those viewgraphs is that ISDB
carries with it a real penalty in C/N margin required, in benign
multipath conditions. Like, 5 dB worse than 8-VSB, which I think is
getting to the point of being a real issue. Especially in a country
whose land mass is about half of the entire South American continent.
ATSC did itself a heck of a disservice by pushing undeveloped products
early on. That legacy is hard to shake. Also, one wonders why the
patents on 8-VSB receivers are even valid anymore, when it seems obvious
that some key early design concepts, e.g. the supposed advantage of
being able to use real-only equalizers, training methods, did not pan
out at all. If decent receivers can't be designed as originally intended
by 8-VSB patent holders, there ought to be some recourse.
Bert
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts: