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54 InFocus Corporation — Introduction Guide - DLP Multimedia Projector
Term Description
Contrast Ratio The ratio between white and black. The larger the contrast ratio the greater the ability of a video
device to show subtle colour details and tolerate ambient room light.
There are two industry methods used: 1) Full On/Off contrast measures the ratio of the light output
of an all white image (full on) and the light output of an all black (full off) image. 2) ANSI contrast is
measured with a pattern of 16 alternating black and white rectangles. The average light output from
the white rectangles is divided by the average light output of the black rectangles to determine the
ANSI contrast ratio. When comparing the contrast ratio of video devices make sure you are comparing
the same type of contrast. Full On/Off contrast will always be a larger number than ANSI contrast for
the same video device.
Crestron
RoomView
Crestron RoomView Connected is built into projectors enabling direct network connectivity for
remote management of AV networks.
Crestron RoomView® Express software provides enterprise help desk management, remote
monitoring and control of global AV networks without any special wiring, hardware or programming.
Once connected to the network, classroom teachers and presenters can instantly control any
installed RoomView Connected™ projector. With no programming required, AV and IT managers
can globally monitor and control networked projectors throughout a school, campus, or corporate
enterprise.
Adding a Crestron control processor enables control of all AV devices, lighting and environmental
systems on the network from any Crestron touch screen, Web browser and Apple® and Android®
mobile devices including iPad™ and iPhone®.
By leveraging the Ethernet port on RoomView Connected projectors and accessing RoomView, AV
managers and support staff can remotely take control of classroom technology, troubleshoot and
perform remote system diagnostics, track projector usage and lamp life, log network activity and
much more. Remote capabilities allow efficient scheduling of projector power-off at preset times,
routine maintenance, faster response times to support calls, alert notifications if projectors are
disconnected, and broadcast messaging of emergency alerts to all projectors.
Crosstalk Interference of an electrical signal by another electrical signal in close proximity caused by its
electromagnetism.
CRT Cathode Ray Tube.
dB dB or decibel is a measure of relative loudness. 0 dB is the threshold of hearing. 60 dB is equivalent
to normal conversation. 120 to 140 dB is the threshold of pain such as a jackhammer or gun shot. 10
db of change will double the loudness.
Deinterlacer Electronic component that converts an interlace video signal to progressive scan.
Deinterlacing Act of converting an interlace video signal to progressive scan.
Diagonal The diagonal of a screen or flat panel can be computed by using the Pythagorean theorem: squaring
the width, squaring the height, adding them together and taking the square root. A 100" diagonal
16:9 screen measures 49" high by 87" wide; a 100" diagonal 4:3 screen measures 60" high by 80"
wide. Use the Projection Calculator to get screen dimensions on all common aspect ratios.
Dichroic A mirror or lens that reflects or refracts selective wavelengths of light. Typically used in projector light
engines to separate the lamps "white" light into red, green, and blue light.
DICOM A DICOM projector (Digital Imaging and Communications in Medicine) provides the medical
profession with the ability to simulate 21 different levels of grayscale in the rendering of X-rays, CAT
scans, MRIs and other medical imaging applications.
DisplayPort DisplayPort is a digital display interface developed by the VESA. The interface is primarily used
to connect a video source to a display device such as a computer monitor, though it can also be
used to transmit audio, USB, and other forms of data. Displayport can be used to transmit audio and
video simultaneously. The DisplayPort signal is not directly compatible with DVI or HDMI

but passive
adapters can be used to adjust the signal levels and convert the connector style.
Glossary