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Glossary
Term Description
Power Focus A motor driven lens that adjusts focus using a button on the projector's control panel and/or a remote
control.
Power Output With audio amplifiers, the amount of power sent to drive the speakers. Peak output is quite often
specified, which is somewhat misleading compared to the average amount of power an amplifier
can continously produce (RMS rating).
Power Zoom A zoom lens that is driven by a motor and controlled from the projector's control panel and/or remote
control.
Pre-amp A switching device used to select a line-level audio signal for amplification. Sometimes offers signal
processing as well.
Progressive
Scan
A display mode in which all the horizontal lines of an image are displayed at one time in a single
frame, unlike an interlaced scan in which a frame consists of two separate fields with the first field
consisting of odd horizontal lines and the second field even horizontal lines. Progressive scan is used
by projectors, computer monitors, HDTV systems, and some digital camcorders. Progressive Scan
requires a faster horizontal scan frequency than interlaced images of the same resolution
Projector A projector is a device that integrates a light source, an optics system, electronics and display(s) for
the purpose of projecting an image from a computer or video device onto a wall or screen for large
image viewing. These devices attach to a computer or video device as you would connect a monitor
or television.
QXGA QXGA is a display resolution of 2048 horizontal pixels by 1536 vertical pixels giving a total display
resolution of 3,145,728 pixels. A QXGA display has 4 times the resolution of an XGA display.
RCA Jacks
Unbalanced connection used extensively in consumer electronics to send a line-level signal. Also
called phono.
Refresh Rate The speed at which a display updates its picture given in Hz.
Resolution A measure of the ability of a display or sound system to render detail.
RGB Red, Green and Blue. A component signal representing each colour separately. Sync signals can be
sent on green or sent separately as a composite signal or dual H/V signals (Horizontal sync/Vertical
sync). Very common signal for analog computer displays.
RGB out An output on the projector that allows you to connect additional monitors or projectors to display the
same image. Also known as monitor loop-through or VGA out.
RS232 The RS232 port on a projector is typically used to connect an external control device like a wall plate
controller or integrated whole room control system to your projector for turning it on and off remotely
or changing the source input. The port is usually a male 9-pin D-sub connector.
S-Video A video transmission standard that uses a 4 pin mini-DIN connector to send video information on two
signal wires called luminance(brightness, Y) and chrominance(colour, C). S-Video is also referred to
as Y/C. Considered a higher quality video source than composite video.
S/PDIF Sony/Philips Digital InterFace. A transport protocol related to AES/EBU for sending PCM digital
audio signals between devices. Uses either 75-Ohm coaxial cable or fiber-optic cable.
Sampling
Frequency
The speed at which data representations of an analog signal are duplicated. The higher the number,
the better the quality. Another quality aspect is the granularity of the scale used for representation
where 16 bits allows 65536 discrete levels and 24 bits allows about 17 million.
Saturation
Saturation is a measure of colour intensity. In the absence of saturation the colour hue is a shade of
grey. A highly saturated hue has a vivid, intense colour, while a less saturated hue appears more muted
and grey.
Scan Rate The line drawing speed of a display, usually given in kHz. A standard definition TV has a scan rate
of 15.75 kHz which when you divide by 525 scan lines, gives a horizontal refresh rate of 30 fps or Hz.
Glossary