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