[opendtv] Re: S-Vid as Good as Component?
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 13 Feb 2008 11:38:43 -0800
Cliff;
S-VIDEO is component; just not necessarily the preferred components.
John
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Cliff Benham
Enviado el: Tuesday, February 12, 2008 3:41 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: S-Vid as Good as Component?
dan.grimes@xxxxxxxx wrote:
>
> Bert wrote:
>
> "BTW, barely related, yesterday I did some A/B testing, comparing S-video
> and component video (set to progressive scan) from my SD DVD
> recorder/PVR to the HD display. Viewing up close, the differences were
> really hard to make out. I used live HD broadcast in the A/B testing,
> not DVD. The results might be different with DVD."
>
>
> This really surprises me. I have tested composite, S-Video, and
> component and found composite and S-Video to have relatively the same
> ability (even after recording) but component really out performed both
> subjectively and objectively for NTSC. But that assumes source
> material with greater than 3 MHz.
>
There is a significant difference in picture quality between composite
NTSC and S-Video, but less of a difference between S-Video and component.
This is due to the need of a really good 3 line comb filter decoder to
separate luminance from chroma in composite. That is where the
difficulty lies. Most TV manufacturers skimp and don't spend much on the
decoder circuitry. The problem is not separating the decoded signal into
RGB, it's separating the luminance from the chroma.
If you own a TV with composite, S-video and component video inputs you
can compare the difference between the composite and S-Video outputs of
a good DVD player, [one that doesn't cheat on decoding from digital to
S], and see the very noticable difference. But if you similarly compare
the S-Video output and the Component output, you won't see nearly so
much difference. This is because the cross color and cross luminance
artifacts are caused by the low quality chroma-luminance separator
decoder in the TV. By using S-Video you bypass this part of the TV
circuitry by delivering chroma and luminance to their respective circuits
after the decoder.
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
