There's not many receivers out there yet, though I'm hoping to try to get one as soon as they're available. Early reports are very good, though.
It likely won't help the home user because it's specialized video in MPEG-4 at reduced resolution. 480x272 I think is the resolution I heard.
- Trip
Ok, interesting. I didn't' figure the market has reponded yet to the consumer side.
So I need to read I can tell because your answers start begging more questions from me. But what the heck
So if they are doing MPEG4 are they using just part of the available bandwidth? How much does 480x272 take in MPEG4? Are they robbing null packets or a little from the main programming?
Could this be the foot in the door for MPEG4?
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The more I understand, the less I know.
Basically, Mobile DTV is split into non-variable groups of 0.917 Mbps. One video feed will fit into that bandwidth, however you'll want to add extra groups in order to have increased error correction. For example, I'm told that WRAL is doing a single video feed, however they're using three groups to provide the error correction they want.
The standard allows up to 8 groups, or 7.33 Mbps, to be given to Mobile DTV.
- Trip
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KJ4IEA
Comments are my own and not that of my employer or anyone else.
According to research firm TeleAnalytics, deployment of gap fillers could delay broadcasters’ deployment of mobile DTV in the United States.
It the July issue of its TeleAnalytics Mobile TV Tracking Service (TMTS) [PDF], the report commented that “ATSC-M/H appears to be on track for a late summer trial in Washington, D.C., but the balance of the 2009 launch schedule (17 markets) may be too aggressive and commercial services might not start until 2010.”
In researching this report, I found a June 2009 update to TeleAnalytics' publication “Making Mobile TV pay: A 2005-2013 Market Analysis of the Service, Silicon, Terminal and Infrastructure Markets.” In the section, “The ATSC Promise,” the researcher emphasizes the need for coverage—both the number of stations and their signals on the ground. The report noted that the deployment of gap fillers from roof locations was a key ATSC-M/H issue. It also observed that Korean broadcasters had arrived at a solution “in the original small T-DBM coverage area” of Seoul. However Brazilian broadcasters were still trying to work out co-location arrangements and that this was hampering deployment of their “One-Seg” system.
As for the ATSC mobile DTV business case, the report noted the complexities in deployment.
“As analyzed, the dimensioning of the ATSC-M/H business case first of all depends on the number of stations that would be on line at any point in time and their geographical location.” And it cautions that “the enablement of the ATSC M/H Ad revenue stream requires the commissioning of an electronic audience measurement system at the earliest point in time.”
I found the cover of “Making Mobile TV Pay” interesting, as it shows a Japanese iPhone with a Softbank One Segment tuner/battery-pack add on. A similar cell phone/smart phone add-on or back-pack could prove an easy way to get ATSC Mobile DTV in the hands of consumers quickly in the U.S.
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