[opendtv] Re: Food for thought
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 15 Feb 2007 19:27:52 -0800
When doing testing of my PSIP generator recently, my customer found that a
very recent Zenith DVR (and at least one other recent STB) couldn't make use
of 720 x 480 video. Not only that, but several other issues disappeared
when he eliminated 720 x 480 video.
IIRC, the Samsung STB had no issues with it, nor did the AutumnWave USB
device.
John Willkie
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
> On Behalf Of Mark Schubin
> Sent: Thursday, February 15, 2007 7:12 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: Food for thought
>
> It was long ago, and it's relevant until ATSC changes the compression
> constraints. Until that happens, broadcasters need to avoid 720h or
> risk hitting TVs that can't receive the signals.
>
> TTFN,
> Mark
>
>
> Ron Economos wrote:
> > You've posted that many times. How long
> > ago was that, and is it still relevant?
> >
> > Ron
> >
> > Mark Schubin wrote:
> >
> >>
> >>> During the development of our ATSC DVD recorders
> >>> at LSI, *we tested all 36 formats* and much more
> >>> (sub-sampled horizontal resolutions, telecine flags in both
> >>> 1080i and 720p, QAM, bad PSIP, high BER, etc.).
> >>
> >> In ATTC's testing, unfortunately, they found two models of DTT
> >> receivers that could not handle 720 x 480 imagery at certain frame
> >> rates (different rates for the two receivers). 720 is not only in
> >> Rec. 601, but it is also divisible by 16. Unfortunately, it's not in
> >> the infamous Table 3.
> >>
> >> TTFN,
> >> Mark
> >
> >
> >
> >
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>
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