DVI picture visibly superior to component
 

I've got a 56" Samsung DLP unit with both HD component and DVI inputs.
I've got a Samsung SIRT150 HDTV tuner and a computer with the MyHD120/DVI in it.
The DVI from the computer is visibly superior to the HD component input. The
fine grain noise that is in the component stuff disappears in the DVI picture.

Hermango

Hermango wrote:
I've got a 56" Samsung DLP unit with both HD component and DVI inputs.
I've got a Samsung SIRT150 HDTV tuner and a computer with the MyHD120/DVI in it.
The DVI from the computer is visibly superior to the HD component input. The
fine grain noise that is in the component stuff disappears in the DVI picture.

Hermango

Your observation is not a surprise. There are two extra conversion
stages required by the DLP display for HD component video then is
required for DVI video. The stages a

For component HD video:
1. One D/A stage in the SIR-T150.
2. One A/D stage in the Samsung DLP unit.
3. One D/A stage provided by the DLP display unit.


For DVI HD video:
1. One D/A stage provided by the DLP display unit (same as 3 above).

The DLP display requires a pulse width modulated wave applied to each
micro mirror (pixel) to achieve variations in gray scale. This is in
effect a D/A stage with the same type of errors as found in conventional
D/A conversion stages. The A/D stage (in 2 above) provides the digital
input to the DSP video processing system. The DSP output provides the
PWM wave to the micro mirror.


For a fair comparison between component video and DVI, the conversion
stages must be the same. Projection tubes, for example, only require one
conversion stage for either HD component video or HD DVI video. The
conversion stages a

For component HD video:
1. One D/A stage in the SIR-T150 (or any suitable STB).


For DVI HD video:
1. One D/A stage in the HD display unit.

This is no surprise. Since the computer is capable of a very detailed and
clean display. I have experimented with this also. I have used various
analog inputs from my computer and DVI gives the best result simply because
it is digital from the computer display card buffer to the hdtv. The
biggest reason is ground loop noise and electonic noise degrades the analog
somewhat and it is hard to avoid, I have even noticed the electronic noise
simply by connecting a exteranl video capture card and have noticed that
cabling is sensitive to analog noise under ceratin circumstances. The
computer generates a lot of electronic noise.

However if you just hook up dvi/analog inputs from a DVD, STB etc I do not
think you will notice much difference if they are well designed and
grounded. In fact the high frequency dropoff of analog can under some
circumstances make the picture look better if the origianl source is not
that good.

Richard R.



"Hermango" wrote in message
...
I've got a 56" Samsung DLP unit with both HD component and DVI inputs.
I've got a Samsung SIRT150 HDTV tuner and a computer with the MyHD120/DVI
in it.
The DVI from the computer is visibly superior to the HD component input.
The
fine grain noise that is in the component stuff disappears in the DVI
picture.

Hermango

Have you compared input from your computer DB15 RGB analog connector to the
Samsung DB15 RGB input?
I believe you can easily use the normal 1024x768 resolution or use
PowerStrip to configure your graphics card output to 1280x720.

HiTach

"Hermango" wrote in message
...
I've got a 56" Samsung DLP unit with both HD component and DVI inputs.
I've got a Samsung SIRT150 HDTV tuner and a computer with the MyHD120/DVI
in it.
The DVI from the computer is visibly superior to the HD component input.
The
fine grain noise that is in the component stuff disappears in the DVI
picture.

Hermango

numeric wrote in message news:h4Q7c.21547
For DVI HD video:
1. One D/A stage in the HD display unit.

Why?

I thought DLP is a digital display with rows and rows of microscopic
mirrors. Hence each mirror should be digitally addressed. Why do you
need to convert a digital DVI signal into analog when you feed to a
DLP display?

"Caloonese" wrote in message
om...
numeric wrote in message news:h4Q7c.21547
For DVI HD video:
1. One D/A stage in the HD display unit.

Why?

I thought DLP is a digital display with rows and rows of microscopic
mirrors. Hence each mirror should be digitally addressed. Why do you
need to convert a digital DVI signal into analog when you feed to a
DLP display?

It's not that simple. As the previous post explained.
Go to www.dlp.com where you will fnd a pretty good explanation of the DLP
light engine
including how it creates gray color gradations.