Archived from groups: alt.tv.tech.hdtv (
More info?)
EskWIRED@spamblock.panix.com wrote in message news:<chcira$bel$3@reader1.panix.com>...
>In alt.tv.tech.hdtv, Isaac Kuo <mechdan@yahoo.com> wrote:
>>EskWIRED@spamblock.panix.com wrote in message news:<ch5hf1$3s9$4@reader1.panix.com>...
> > >Yep. Panasonic 36" 4x3.
>>Your model might have limited modes for 1080i. My CRT based
>>Mitsubishi 4:3 set has a couple modes for displaying 1080i
>>over the full 4:3 of the screen. I use one of these modes
>>for a nice 1280x960 computer display.
>Wow. I had no idea. Where in the setup menus might such
>a mode be located?
In the case of a Mitsubishi set, it's not a menu but rather
just one of the buttons on the remote control--the aspect
ratio mode button. When my 4:3 model is receiving a 1080i
signal, this button cycles among:
1. "Standard" -- the display is full screen, stretched to
fit. Ironically, there isn't anything "standard" about
this mode. With normal HDTV source, this mode is
stretched vertically so everything looks too tall.
2. "Letterbox" -- the display is letterboxed, with a widescreen
display and grey bars above and below. This mode is
suitable for normal HDTV source.
3. "Expand" -- the display is full screen, with the left
and right chopped off. This mode is also suitable for
normal HDTV source, but it doesn't show the full image.
I use "Standard" mode for my computer display since it does
the least processing on the input signal. The stretching
is okay because I can customize any sort of display on the
computer. Fortunately, Mitsubishi models remember different
modes for each input. When I switch to the computer, it
automatically remembers it should go to "Standard" mode.
When I switch to the HDTV box, it automatically remembers
it should go to "Letterbox" mode.
>I have an aspect ratio setting in the menus, but I'm not sure
>if that is what would do it.
The aspect ratio setting is what you need, but your particular
model might not offer any suitable setting when receiving
1080i input. Many models only offer aspect ratio options
when receiving 480p input. This is because DVDs come in
both 4:3 and 16:9 aspect ratios. There's no way for the
TV to automatically detect which aspect ratio is appropriate
so it must be manually set.
In contrast, 1080i is standardized at a 16:9 aspect ratio.
There's no need for an aspect ratio option because there's
only one correct aspect ratio with standardized signals.
>>However, if you use Powerstrip, you may be able to "fool"
>>your set into displaying full 4:3 960i using 480p timings.
>>Note that while Ati Radeons have excellent interlaced
>>display capabilities, this will only work with the VGA
>>output (RGBHV), and NOT with the Ati Component dongle.
>>The Ati Component output dongle somehow limits the
>>available modes in the hardware.
>I'm using the VGA-to-component adaptor. Is that what you
>mean by the component dongle?
Yes. Basically, you don't have many options for customizing
your display mode with the component dongle. Assuming your
TV does not have RGBHV input capability, then the only way
for you to get more customized display modes is to get a
VGA->Component transcoder. A transcoder has some electronics
to convert RGB into YPrPb, so they're a little expensive.
IMHO, it's probably not worth the effort.
>>Your TV may or may not have any RGB input, and even if it
>>has RGB input capability, the set might have some bizarre
>>restrictions on the available resolutions with RGB input.
>By RGB input, do you mean component? It has S-Vidos, composite and
>Component inputs.
No, component is not RGB, even though the colors of the
connectors are typically red, green, and blue (an unhappy
choice, since "red" is already typically used for the
right audio). The three signals in component are luminance,
red chroma, and blue chroma; the horizontal and vertical
sync signals are carried on the luminance line. These
components carry essentially the same information as RGB,
but in a different way that's more suitable for long
cables.
A 15-pin VGA connector uses RGBHV. There are separate
signal lines for Red, Green, Blue, H-sync, and V-sync.
Having all these separate lines had made VGA monitor
electronics simpler, but it's not very suitable for
long cable lengths.
Isaac Kuo