[opendtv] Re: So Soon? Next-Gen Broadcast TV In Works | TVNewsCheck.com
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 27 Apr 2011 16:34:02 -0500
Bob Miller wrote:
> Truly amazing, in only two years they turn this around and start over.
I dunno, Bob. From my perspective, any serious business should be doing this
sort of thinking constantly. Certainly the cell industry and the computer
industry have been. The IETF is constantly churning out new ideas. No one can
afford to stay put.
I think the trick is to do it right, to always worry about legacy, and to
choose solutions that have a future.
The existing ATSC physical layer has been around since 1994, after all. The
ATSC standards have evolved quite a bit during that time, but the physical
layer has been unchanged, except for the addition of M/H. Shouldn't be a big
surprise if there's talk of changing that too, a few years from now. Is anyone
still using coax Ethernet? Not too many are.
And yet, as far as spectral efficiency ITSELF goes, 8T-VSB is hard to beat (at
comparable C/N margin). I think the trade press hype should focus on ease of
reception more than spectral efficiency, when it comes to advantages of new RF
schemes for TV broadcasting. Or sharing service, like Mark Aitken talks about.
Any significant spectral efficiency increase, that actually translates to
*broadcast* scenarios, is not readily available from LTE. From DVB-T2 maybe
some, but not much, at comparable C/N margin (thanks to improved FEC). But of
course, there are other benefits that would accrue with DVB-T2, just as there
are with LTE.
Bert
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