[opendtv] Re: E-petition on HD spectrum is rebuffed

  • From: "Bob Miller" <robmxa@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Thu, 1 Mar 2007 14:25:02 -0500

Just looking at the D Mux they seem to have six SD program channels
and nine radio channels on at the same time.

http://www.unsatisfactorysoftware.co.uk/dtt/dtt.cgi

Bob Miller

On 3/1/07, Manfredi, Albert E <albert.e.manfredi@xxxxxxxxxx> wrote:
Craig Birkmaier wrote:

> They can maintain the current SDTV service and add multiple
> HDTV channels when they can utilize the spectrum they
> already have at maximum efficiency.

Not really.

The existing 4 or 5 MPEG-2 SD streams require 14 to 15 Mb/s. Even at
64-QAM, that leaves less than 10 Mb/s in each multiplex for HD streams.

I think the best bet, to get HD on Freeview with no more spectrum, is to
transition to 64-QAM and all AVC compression, and to all receivers being
HD-stream-compatible. This avoids having to simulcast.

That should permit transmission of two HD programs and maybe three SD
programs in the same multiplex, which equals the 5 program streams they
transmit now (max) in each 16-QAM multiplex.

Bert


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