[opendtv] Re: E-petition on HD spectrum is rebuffed
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 1 Mar 2007 11:23:54 -0500
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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