[opendtv] Re: Information on ATSC M/H (MDTV)
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 13 Nov 2008 10:18:28 -0800
Tom, I just can't answer at this point; I've read of and know about frame
rate, but I'm not sure that I've read anything about that in unclassified
sources, so I must be silent for the time being.
I can maintain my consistency; MDTV will not work with legacy receivers, and
even if it did, it's unlikely that consumers at home will be interested in
the perceived quality of the "common" video offered.
I can say that the whole architecture has been gone-over to make it
future-proof to the maximum extent possible.
Also, notice that I've never said anything about the status of the
document(s), nor about release dates, except to say that it "should" be out
before the end of the year.
That article mentioned a 600 kb/second data payload in a 2 mb/second
bit-budget per "parade." This is significant, since 2 mb/second basically
means that even a single MDTV parade can't co-exist well with high-motion
MPEG-2 HDTV content, without some fancy encoding of the MPEG-2 video/audio.
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Tom Barry
Enviado el: Thursday, November 13, 2008 4:35 AM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: Information on ATSC M/H (MDTV)
John -
416x240 is quite easy to make from 480i without any fancy deinterlacing
if you send only 30 frames per second. Do you know if that's what they
intend for mobile?
- Tom
John Willkie wrote:
> I had some free time today, and I took a look at the October issue of
> Broadcast Engineering.
>
>
>
> Lo and behold, there's an article by Jay Adrick of Harris and Wayne Bretl
of
> Zenith on ATSC MDTV. The article is available on-line
> http://broadcastengineering.com/RF/mobile-dtv/index1.html
>
>
>
> One tidbit that might be of interest here is the video size: 416 x 240.
> They call it 16:9, but the ratio is 1.73333, where 16:9 is 1.77777. More
> accurately, it's somewhere between 15.7 and 15.8 to 19.
>
>
>
> The yarn isn't in tremendous detail, but one can learn how the system
works
> on the transmit side.
>
>
>
> I did notice one (presumed) nit: they refer to the Initial Demonstration
of
> Validity (IDOV) tests that were performed earlier this year. The report I
> read on May 15 was called the "Independent Demonstration of Validity"
tests,
> and as one participant told me at NAB: "that's three distinct concepts."
>
>
>
> Alas, I and the many other members of this reflector who have read that
> report can't talk about it, but "initial" doesn't do it justice.
>
>
>
> Also, I thought it was interesting that the article mentioned the h.264
> video codec version in the proposed system, but not the version number of
> the audio codec.
>
>
>
> Only time will tell when or if the candidate standard is released to the
> wild. I have read all sorts of articles on the dates when things should
be
> finalized, but I've never actually read an article that provides dates
that
> coincide with the planned dates, so I choose not to mention those. And,
> things could change .
>
>
>
> So, who's excited enough to watch MDTV simulcast content in not-quite
16:9,
> at much less resolution than is available in HDTV? And, does your TV have
> an IP stack?
>
>
>
> By the way, there are several significant proposed features that - at best
-
> are only alluded to in these articles. So, this is only a peek behind the
> curtain.
>
>
>
> John Willkie
>
>
>
>
>
>
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