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Extron’s System 4LQxi is a line quadrupler with a built-
in, four-input switcher. It provides universal projector con-
trol and is compatible with most digitally controlled data
grade projectors on the market today. The System 4LQxi is
also quad-standard compatible with NTSC 3.58, NTSC
4.43, PAL and SECAM for use with all international video
formats.
Line quadrupling is similar to line doubling except that
the number of horizontal scan lines are increased by a fac-
tor of four instead of two. Increasing the horizontal scan
rate by a factor of four (to 63 kHz), allows most CRT’s to
obtain a range of optimum efficiency, maximizing light
output with projector light output up to 60% brighter
than NTSC, PAL, or SECAM displays. In addition to
increased picture brightness, the image becomes smoother
and has a “film-like” quality.
Extron’s System 4LQxi has a high quality three-line adap-
tive comb filter which provides a crisp, stable image. In
addition, an internal TBC (Time Base Corrector) actually
cleans-up low quality videotape signals (common to VHS
tape players) for a more stable and sharper image. The
System 4LQxi also provides motion mode compensation
to remove the motion “jaggies” typically found in line
doubled and line quadrupled video.
In a large-screen venue application, the need for a line
quadrupler 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 resolution on the
larger screen. With the horizontal scan rate increased by
four, the System 4LQxi fills in the gaps and the light out-
put is therefore increased. The projector’s light output
capacity is now more fully utilized and thus, the overall
picture is brighter.
Universal Control
The System 4LQxi includes universal projector control
that will operate with most digitally controlled projectors
on the market today such as Ampro, Barco, Electrohome,
Hughes/JVC, Mitsubishi, NEC, Panasonic, Runco,
APPLICATIONS
SELECO, Sony and Toshiba, as well as the Mitsubishi XC
Series monitors. The System 4LQxi has four universal
inputs capable of accepting all computer RGB signals,
composite video and S-Video (S-VHS) standard signals
(NTSC, PAL or SECAM). Any video or 15.75 kHz RGB
Signal will be quadrupled.
The universal projector control function allows bi-direc-
tional “talk & listen” communication with most large-
screen CRT-based projectors. When connected, the System
4LQxi will be recognized by the projector as the projector’s
own brand of switcher. The System 4LQxi can turn the
connected projector on or off, switch input memory blocks
for convergence, and set-up saved configurations 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 4LQxi 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 control
functions of each projector-brand switcher that is connect-
ed. And it works the same way with all brands– only the
internal communications board dip switch settings are dif-
ferent. In fact, the System 4LQxi may be controlled via the
projector manufacturer’s remote control.
Audio Switching & Processing
The System 4LQxi is also compatible with balanced and
unbalanced, two-channel stereo audio. The System 4LQxi
has the ability to switch between the four audio inputs. The
audio can either follow any video or RGB input signal or 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 professional A/V applications.
APPLICATIONS (Cont.)