[opendtv] Re: Public M/H information
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 22 Dec 2008 17:26:22 -0800
I think it's easy to understand that if M/H is anything like A-VSB in the
most robust mode, there wouldn't be any M/H.
A-VSB has been around for quite some time. Adoption/interest rate: zero.
Indeed, improved A-VSB would appear to be one of the proposals that ATSC and
OMVC accepted for consideration, and "for the most part" A-VSB lost.
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Manfredi, Albert E
Enviado el: Monday, December 22, 2008 4:25 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: Public M/H information
Tom Barry wrote:
> If you are just used to analog TV that wouldn't be true. But
> after seeing blu ray or quality HD a bit then even a properly
> upscaled DVD is not quite good enough when sitting close to a
> 1080p large screen. This also makes me wonder about the utility
> of back seat auto displays since I guess people sit pretty
> close to them (I've never had one). But if it's just kids in
> the back seat maybe they are fairly forgiving about video
> quality.
>
> Upscaling 240p on a large HD display will look horrid. Though I
> suppose it might still be a useful fall-back if reception
> conditions did not permit the HD channel.
I watch RAI and TF1 news at ~300-400 Kb/s, full screen, sitting up to a
PC, and it's soft but not so bad. TF1 uses WMP, RAI uses Flash, the
quality is similar. I figure, sitting a few screen heights away from an
HDTV should not be any worse. The episodes on www.abc.com look much
better by comparison. I don't know the bit rate, though.
If M/H is anything like A-VSB, in the most robust mode, the C/N margin
has to be ~4 dB, with a single receive antenna. That would be great for
degraded conditions or for DXing stations from far away.
Bert
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