[opendtv] Re: Toward digital TV

  • From: Bob Miller <bob@xxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Thu, 15 Dec 2005 18:06:51 -0500

Manfredi, Albert E wrote:

>Barry Wilkins wrote:
>>Exactly why then is HDTV being pushed in the USA? Especially
>>when it has such an inflexible DTTV transmission arrangement.
>My answer is that the sale of "flat panel" televisions, which
>accounts for a healthy percentage of TV sales now,
>simultaneously increases people's awareness of image quality.
>People may not be screaming for the best possible HD, as Doug
>does, but they are demanding more than SD or sub-SD quality.
>I don't think DBS can compete unless it accommodates these new
>flat panel owners.
>When Dish and DirecTV wanted to merge, one of the arguments
>they used was the spectrum needed for local into local and HD,
>IIRC. It didn't fly, but at least it does show that they're
>well aware of the spectrum crunch they face.
>Not to say there won't be a constant battle between more
>channels and decent quality. I just think the sweet spot has
>moved toward better quality in each channel. Cable can provide
>more b/s per channel.
>As to "inflexible" DTT arrangement, as inflexible as it is, it
>does favor HD. Because the inflexibility of 8-VSB is toward the
>high end of the spectrum efficiency curve, not the other way
>The effort in 8-VSB is to make the scheme as robust as possible
>while not reducing the b/s per channel. Conversely, the effort
>in Euro COFDM plants is to increase the spectrum efficiency in
>order to accommodate HDTV.
But COFDM DVB-T was more robust at a higher bit rate than possible with 
8-VSB in 2000 as demonstrated by Sinclair at the Hearings. 19.76 Mbps 
with a mobile antenna while 8-VSB was only up to 19.34 Mbps in a fixed 
position with a directional antenna.

Bob Miller
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