TM
USING Deuce
®
VIDEO SCALERS IN
VIDEOCONFERENCING APPLICATIONS
MARKET: Videoconferencing, DOC. NUMBER: T-07
Distance Learning, Telemedicine
Over the past several years, videoconferencing
has increasingly replaced face-to-face meetings as
an effective means for businesses, municipalities,
schools and medical facilities to hold conferences
between several facilities located in distant locations.
In a videoconferencing scenario, each party trans-
mits and receives sound and images through a co-
dec – the heart of the videoconferencing system.
Traditionally, the signals received by these codecs
were fed to a standard NTSC or PAL television moni-
tor, for viewing by the involved parties. However, in
today’s hi-tech boardrooms and videoconferencing
facilities, there are often better quality, higher-reso-
lution display devices available for viewing the con-
ference. These include data projectors, LCD pan-
els and plasma displays.
Most of these devices allow for the direct input of
an NTSC or PAL signal from the codec. However,
this requires the device to perform additional pro-
cessing in order to display the image. Deuce elimi-
nates this requirement.This TECHniques describes
how , by matching the “native resolution” of the de-
vice, Deuce generates a videoconferencing image
that appears much more crisp, clear and artifact-
If your codec offers both an S-video and video
free, allowing the high-res display device to perform
output, use the S-video output to connect to Deuce.
to its maximum potential.
You will benefit from a higher quality converted
image.
A codec outputs a standard, interlaced NTSC or
PAL video signal. All Deuce Video Scalers provide
the ability to convert these types of signals to a non-
interlaced computer video format, at a variety of
resolutions and refresh rates. The output from
Deuce can then be fed to any
number of high-resolution
display devices, including
data projectors, LCD panels
and plasma displays.
Connecting Deuce to a co-
dec is extremely simple. In-
stead of connecting the video
If trying to determine which Deuce model would
best suit your videoconferencing application,
consider the highest resolution you would like to dis-
play, as well as whether you will want to output to
a widescreen display. Specific differences between
output from the codec directly to a TV or video moni-
tor, it is connected to one of Deuce’s video input con-
nectors. The output from Deuce is then fed to the
intended display device. Depending on which Deuce
model you are using, the unit will allow you to scale
to a variety of common computer and fixed display
resolutions. When using a CRT display device, you
will obtain the best picture by having Deuce output
the highest resolution that the display device can sup-
port. If using a device that uses fixed-resolution or
discrete-resolution technology, such as an LCD or
plasma display, then the best picture quality will re-
sult if you match Deuce’s output to the “native reso-
lution” of the display device. This resolution is usu-
ally listed in the projector’s or monitor’s product
manual or on the manufacturer’s web site. (Deuce Pro
resolutions in both the standard 4:3 and widescreen 16:9
aspect ratios.) Note that a display's “native resolution” is
not always the highest resolution that the device can
support. Rather, it is the resolution that exactly
matches the number of pixels that comprise the
device’s display area.
Deuce, TwinSplit, QuadSplit, HexiSplit, OctoSplit, DeciSplit and Scan Do are registered trademarks of Communications Specialties, Inc.
© 1999, Communications Specialties, Inc.