Communications Specialties Scan Do 1024 Manual del usuario - Página 12
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S-VIDEO, THE IMPROVED QUALITY
VIDEO STANDARD
Most of us are familiar with two forms of TV video. RF, which
is how cable TV and over the air TV comes into our homes,
and Composite Video or just plain Video.
sometimes called "baseband" video. Composite video is, as
its name implies, a single electrical signal which is made up
of brightness, color, and synchronizing components. It is
simple to communicate and record on VCRs. If we take this
signal and place it, or modulate it, onto a TV channel we have
what is called an RF video signal. The problem comes in
when your TV/monitor or VCR has to break the signal apart
to show it on the screen or record it on tape. Much processing
is involved and distortions of the image will occur.
Several years ago, TV engineers devised a simple scheme
which was not only relatively inexpensive to implement but
very effective in reducing the distortions that occur in TV/
monitor/VCR processing. It is called S-VIDEO.
In this TV signal system, there are actually two signals. The
LUMINANCE or "Y" signal carries the sync and brightness
components while the CHROMA or "C" signal carries the
color component. By keeping these two signals separate
before they go into the TV/monitor, it eliminates the need for
the TV/monitor to do the work of separating them inside the
set. The result is a displayed image that has more detail and
less color distortion. If you were to compare any given image
on a TV/monitor between the VIDEO and S-VIDEO modes,
the difference in the quality of the images would be dramatic.
Almost all of the new larger screen TVs (25 inches and
+
above) that have audio/video jacks will also have an S-
VIDEO jack just like the one on the rear of Scan Do 1024. If
it is available: USE IT! You will see a difference.
Scan Do 1024 User's Manual
"Video" is