tions for SDTV, the criteria is going to be more
Application
detail, not more light output as manufactur-
scale and convergence. That's easy to obtain
for an RGB input, as is the case with most
to the higher category.
pendent of incoming signals. We feel that
proportional to horizontal resolution. As res-
olution goes up, light output goes down. It
gray scale, it should also track gray within a
Since these are "DTV Certified" specifica-
ly important to the resulting picture quality
ket. Certainly at an ED or HD level, the color of
performance capability of the tube. While
will go down to the point where, if we were
from a projector, the screen material plays
white signal is needed to help assure prop-
provided. If the display device only provides
categories. Since the matrix is important to
lenticular screens we've encountered would
used in the broadcast world is 6 CIELUV.
audio. In any event, a high-end display
A display aspect ratio of 1.33:1 would be
critical that it even approaches the capabili-
versus "i" look enough better to place the
difference in color. We would assign specifi-
we might only be capable of declaring a
ties will also have to be considered. Then
size gets larger and the focus capability gets
calibrated at the high and low points of the
n't been widely available in the consumer mar-
fication specification. Any of the fresnel,
be easy for the person trained in properly
bility of shutting off the Pb and Pr must be
FROM
rience that a Y, Pb, Pr connection is critical
red, green, and blue should closely conform
the specifications found in the EDTV and
ation set is to handle that part of DTV. We
cations to DTV categories according to their
tem. It is slightly different from that defined for
the higher resolution capability of the DTV sys-
The DTV tuner specifications are obvious-
displayed on any of these sets. A separate
high-end video projectors, a Y, Pb, Pr to RGB
jectors in either a front or rear screen con-
stringent than might be found for a regular
better than the "i" signal to bump the "p" up
to the set is serial digital, an internal capa-
WIDESCREEN REVIEW NEWSLETTER 27
there's audio. Part of high-end certification
beneficial if used on variable rate-capable
standard definition, a color set that really has-
CRT-type projectors, in order to obtain the
9
setting a gray scale. The resolution of the
and must be easily calibrated. What does
WSRnewsletter27 v2.qxp:#88 Reber HD Wars v3GRTL
limited by its input(s) and signal process-
vertical resolution in the "p" version is enough
What about the shape of the set? SDTV
better performance in the CRT. Yet there are
At this point we're providing a first draft,
display device as DTV-ready. If a DTV
if you can disconnect Pb and Pr. If the input
conclusion here is that while horizontal reso-
8/15/08
have that to themselves by default.
We've already alluded to the fact that the
Definition Television
SDTV -- Standard
color quality, we should also cover the other
tracking and the primary colors of the dis-
the set won't produce enough useable light
sync specifications should be able to han-
the near future. As an example, the stan-
As for the matrix decoding, gray scale
figuration. In reality, direct view sets wouldn't
better, the performance increase is in picture
primary colors of red, green and blue; and
categories should be widescreen, a 1.78:1
position on the quality scale.
output for external processing of the
play factors become more significant as you
view sets, light output capability is inversely
on the market, but probably not.
converter must be part of the specification
something designed to stimulate discussion.
get beyond SDTV. They belong near the top
ing a multi-sync display device. This
as the correct colors of red, green and blue,
lines at 59.94 Hz, otherwise known as 480i
output to be considered for any certification.
current analog interlaced TV system of 525
device should not be part of the acoustic
for display devices with a built-in DTV
to obtaining good picture quality, plus hav-
acceptable, but not limited to that shape. An
assembled that would meet these specifica-
current stand-alone equipment. We do feel
display devices.
set so we can't specify how a current gener-
625/50 be considered? That might depend
might even have to date the specifications,
That must also be part of any real DTV certi-
DTV system is dynamic. Specifications set
another reason for wanting these specifica-
Engineers' (SMPTE) definitions for the 1080i
lution capability can't be ignored, it's not
today will most likely have to be changed in
tions dated. It is our firm belief that in the
ers would have you believe. You'll have to
While still on the subject of picture resolu-
be equal for 1080i or 1080p. Does the "p"
tuner is part of the package, its capabili-
for them.
that are currently on the market and will be
That's three times the minimum perceptible
tion, there are additional factors to consider
ty of the high definition source signals for
and IDTV could both be 1.33:1, with the IDTV
You might think that we'd have to consid-
er calibration of black-and-white levels, gray
the cost of high quality translation from any
There is a set of primary colors defined for
approach is required for fixed array displays
Scan rate capability need only cover our
1:50 PM
HDTV parameters isn't going to happen in
no matter what the capability of the set. The
bility of good sets that are already available.
dle VHS in standard play as well as fast for-
future, all display devices will run at their
capabilities in the source signal will produce
How important is horizontal resolution in
controls should be good enough to make
happens if we apply what we've discussed.
certain specification. The number commonly
the same for 480i and 480p, just as it could
we're on the subject of picture performance
of the viewer from the picture is important.
display. Display devices in the EDTV or HDTV
qualify for the HD category, so projectors
As for gray scale tracking, it's as critical
accurate calibration easy. Once the set is
significant limitations here as well. As the CRT
We fully recognize that getting to some of
tions. Readers' comments are always welcome.
own rate, and at just one rate--totally inde-
when answering that question, but horizon-
tuner might include a serial digital audio
tal resolution isn't as important as it is cred-
Looking at the video input, it is our expe-
image somewhere in the 1.33:1 area of the
aspect ratio if we stick to the ATSC criteria.
ber of considerations to be taken into account
ing. Where an external tuner is required,
that should be spelled out prior to certifi-
er a separate category for CRT-based pro-
The Archives
ing an advantage in setup. A black-and-
any of these categories? There are a num-
in the DTV system. All color decoder and
"p" in a higher category? Absolutely! The
There are several more important points
two important parameters of color fidelity: the
cation. The display device can easily be
hard-pressed to see half of the 1920 lines
in a direct view display device. The distance
Anything more than one or two picture heights
certification process will have to be set up
dards for data transmission have yet to be
across the width of a 32-inch wide screen,
based projectors. Often times higher line rate
to attempt to clearly reproduce 1920 lines
reproduction capability.
an equally important role in picture quality.
gray scale tracking.
keep the screen size down, even on 9-inch
Enough of the background. Let's see what
away from a 30-inch wide set and you'll be
The same light output versus resolution
for high-end DTV certification.
TV set, yet not much beyond the current capa-
ward and rewind. Should the PAL rate of
incoming format to the ideal rate for the
individual display will be far less than build-
that combinations of equipment could be
not fit into the ED or HD categories.
and 720p systems; they are both the same.
calling them SDTV `99 or HDTV `01. There is
that mean? Access to the controls should
ited in most circles. When it comes to direct
Page 9
most of the categories.
consideration isn't necessarily true for CRT-
of the list for consideration in the advanced
to the Society of Motion Picture and Television
set having the capability of displaying a 1.78:1
<< < [Pag.9] > >>
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