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RF. Any frequency between normally audible sound waves and the infrared light portion of the
spectrum. RF can pass through most objects making it extremely versatile when used to control
devices. Used in remote controls.
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The type of jacks used by most stereo equipment and VCRs - audio and composite video input.
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The emulation of color creating 16 pastel colors. No longer the industry standard.
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Projecting an image through a translucent screen material for viewing from the opposite side.
See also Front Projection.
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On Overhead Projectors (OHPs), the light source is in the head of the projector. This type of OHP
cannot be used with LCD panels because the light must pass through the panel twice, causing an
extremely dim image.
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The number of times per second a displayed image is regenerated. Measured in Hertz, e.g.,
60Hz or 60 times per second. The faster the rate, the steadier the image.
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A company or store that sells electronic equipment (including projectors) from a variety of manufacturers.
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The number of pixels or dots that make up an image. The higher the
number of pixels, the better the resolution, which creates a finer and smoother image. Higher resolutions
allow more information to be displayed on the same size screen. VGA = 640x480, SVGA = 800x600,
XGA = 1024x768, Wide XGA = 1366x768, SXGA=1280x1024, SXGA+=1400x1050, UXGA=1600x1200.
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Acronym for Red, Green, Blue. These three colors represent the entire color spectrum.
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A way of comparing the cost of a projector or other equipment and the
benefits it provides or the money it will save an organization. Abbreviation for "return on investment."
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Read-Only Memory. Memory that can be read, but not modified. The contents of this memory are
retained even when the computer is turned off.
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Also known as Serial Interface. An interface between a computer and a serial device, such as a printer,
modem or mouse. A projector is considered "RS-232 enabled" if it has a control port on the
unit that allows serial control (of the projector's functions such as on/off, focus, zoom and image
adjustments) from a remote accessory, such as a Crestron or AMX control board. Not all control
ports allow RS-232 control. Some are for remote mouse control only. Please check your projector's
manual for further information on your specific model.
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Small Computer Systems Interface. Pronounced "scuzzy". SCSI is the second-most
popular interface standard for hard disks. Most scanners and CD-ROM drives are SCSI. You can hook
up to seven SCSI devices to one SCSI interface.
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SE-quential C-oleur A- M-emoire. Pronounced "Sea-Cam". Sequential color with memory.
The television standard for France, Eastern Europe, Russia, the former Soviet Republics and some
countries in Africa. SECAM is 625 lines of resolution with a refresh rate of 50 Hz. SECAM refers to
a type of video or television signal.
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Also known as RS-232. An interface between a computer and a serial device, such as a printer, modem
or mouse. Information is sent in single bits, one after the other. Much slower than parallel interface.
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A connection on a computer, usually COM1, where you plug in the cable for a serial device.
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A feature on select projectors that allows the unit to be placed at the front of the room
and still project a full-screen image. Ideal for small venues.
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SuperTwist Nematic. An LCD type that is passive matrix. DSTN is monochrome, TSTN is color.
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Super Video Graphics Array. A screen resolution of 800x600 pixels.
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Super XGA. A screen resolution of 1280x1024 pixels.
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Super XGA Plus. A screen resolution of 1400x1050 pixels.
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Super-Video Home System. A VCR with higher resolution than normal composite video. S-VHS uses a
different connector than composite video.
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This signal is a composite of horizontal and vertical lines. In many LCD models you can adjust the
sync through a menu option called Sync. This will clear up jittery or jumpy images.
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A type of video input that carries separate brightness and color signals from a source
such as a DVD player or TV to a projector. (Component video combines brightness with each of the three
color signals. S-video cables use small multi-pin connectors.
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An adapter plugged onto the end of a cable to send a signal back to the computer telling it there
is nothing attached. This often helps to clear up sync problems when no monitor is attached to the
y-connector.
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Thin Film Transistor. A technology used to make active matrix LCD panels where each pixel has its
own transistor switch. This technology allows for sharper looking colors than ColorStripe or TSTN.
TFT is used in Amorphous TFT and TFT.
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A term used to describe a configuration of three Cathode-Ray Tubes(CRT) used to create and display
an image.
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The distance from the projector to the screen. All projects have a minimum and maximum
throw distance, expressed in feet.
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Tracking is a menu option used to adjust for vertical hum-bars in some multimedia projectors.
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In overhead projectors, the light source is on the bottom of the projector. This type of overhead
projector is required when using LCD panels.
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The amount of light which passes through an object. Measured in percentages. This is the
brightness measurement applied to LCD panels.
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Refers to the color saturation of passive matrix. It closely matches the colors displayed on the monitor.
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Triple SuperTwist Nematic. A form of passive matrix. TSTN creates color by allowing light to pass through
the pixels that are in use and those not in use.
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