[opendtv] Re: DEA-what? was: Re: Re: News: DIRECTV Sued Over HDTV Picture Quality
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 21 Sep 2006 17:41:27 -0400
Bob Miller wrote:
> Multicast overlay, sounds great, now if we only had a
> decent, just a run of the mill, modulation that actually
> worked.
Multicast overlay is essential if you want a circuit-switched cell phone
network to scale up to simultaneously deliver emergency info to the
masses. It simply would not work otherwise. For this same
inform-the-masses mission, multicast overlay is only a nice-to-have in a
network that already supports a broadcast protocol.
Bottom line is that if analog TV goes off the air, ATSC will have to
take its place. All the fancy protocols they're considering aren't
essential to the basic mission of informing the public. What I think is
essential are protocols that allow consistent info to be disseminated
simultaneously over all mass media.
> Now how do you suggest that an advanced VSB system is
> not as good as the one we have Bert? Not worth switching
> to even for Homeland Security?
Well, let's not get too pompous about this. NTSC is also not the best
system for homeland security, right? These are supposed to be low-cost
commercial solutions which in a pinch are re-purposed to disseminate
emergency information. No one pretends that they are systems built and
optimized from the ground up for emergency services. They are clearly
not. If they were, they would not be affordable by the masses.
I figure, if I can use my rabbit ears to pick up several stations from
several diffent directions (check), and each one can transmit multiple
subchannels (check), and the subchannels can present radar pictures with
warnings about bad stuff sent in real time (check), that's not a bad "in
a pinch" system. Heck, even if all DC stations go off the air, I can
still receive Baltimore.
Along with AM/FM radio, battery operated.
Bert
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