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Extron’s System 4LDxi is a line doubler with a built-in,
four-input switcher. It provides universal projector con-
trol and is compatible with most digitally controlled
data grade projector on the market today. The System
4LDxi is also quad-standard compatible with NTSC
3.58, NTSC 4.43, PAL and SECAM for use with all
international video formats.
Line doubling increases the horizontal scan rate by a
factor of two (to 31.5 kHz) and allows most CRT’s to
obtain a range of optimum efficiency, maximizing light
output. This light output is much brighter than stan-
dard NTSC, PAL, or SECAM displays. In addition to
increased picture brightness, the image becomes
smoother and has greater clarity.
Extron’s System 4LDxi has a high quality three-line
adaptive comb filter which provides a crisp, stable
image. In addition, an internal TBC (Time Base
Corrector) actually cleans-up low quality videotape sig-
nal noise (common to VHS tape players) for a more
stable and sharper image. The System 4LDxi also pro-
vides motion mode compensation to remove the
motion “jaggies” typically found in line doubled video.
In a large-screen venue application, the need for a line
doubler becomes increasingly apparent. When display-
ing conventional NTSC, PAL or SECAM video onto a
large screen, the spaces between scan lines are obvious
and make the picture look dark and diminished. The
lack of brightness is caused by displaying a low resolu-
tion on the larger screen. With the horizontal scan rate
increased by two, the System 4LDxi fills in the gaps
and the light output is therefore increased. The projec-
tor’s light output capacity is now more fully utilized
and thus, the overall picture is brighter.
Universal Control
The System 4LDxi includes universal projector control
that will operate with most digitally controlled data
grade projector on the market today such as Ampro,
Barco, Electrohome, Hughes/JVC, Mitsubishi, NEC,
Panasonic, Runco, SELECO, Sony and Toshiba, as well
APPLICATIONS
as the Mitsubishi XC Series monitors. The System 4LDxi
has four universal inputs capable of accepting all comput-
er RGB signals, composite video and S-Video standard sig-
nals. Any video or 15.75 kHz RGB signal will be doubled.
The universal projector control function allows bi-direc-
tional “talk & listen” communication with most large-
screen CRT-based projectors. When connected, the
System 4LDxi will be recognized by the projector as the
projector’s own brand of switcher. The System 4LDxi can
turn the connected projector on or off, switch input
memory blocks for convergence, and set-up saved config-
urations by input selection of the connected projector.
It will then “talk” as well as “listen” to the projector for
continuous update changes, feature changes or input
selection changes made by the user.
All this makes the System 4LDxi easy to learn, as it
works almost identically to the projector-brand switcher.
The advantage is one switcher for all projectors; there is
no need to learn all the different types of set-up and con-
trol functions of each projector-brand switcher that is
connected. And it works the same way with all brands–
only the internal communications board dip switch set-
tings are different. In fact, the System 4LDxi may be
controlled via the projector manufacturer’s remote
control.
Audio Switching & Processing
The System 4LDxi is also compatible with balanced and
unbalanced, two-channel stereo audio. The System
4LDxi has the ability to switch between the four audio
inputs. The audio can either follow any video or RGB
input signal or can be broken away from the video. With
"breakaway" switching, the audio signal may be separated
from the video signal to switch either the video only or
the audio only. For example, in an application where the
user wants to show the video only from input source
“one” in conjunction with the audio from input source
“two”, the audio would be broken away from source one
and source two would be switched to the final output.
This provides increased flexibility for all types of profes-
sional A/V applications.
APPLICATIONS (Cont.)