select a letter for terms starting with that letter:
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| L | M
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| X | Y
A general term used to denote an increase in signal
power or voltage produced by an amplifier in transmitting
a signal from one point to another. The amount of gain
is usually expressed decibels above a reference level.
Opposite of Attenuation.
The light output of a CRT is not
linear with respect to the voltage input. This non-linearity
follows an exponential function called "Gamma".
The original Internet term for what is now called router
or more precisely, IP router. Refers to systems that
translate from one native format to another.
A method of synchronizing video equipment by using a
common, external "Genlock" signal. A device
which locks the frequency of it's internal sync generator
to an external source.
A shadowy or weak image in the received picture, offset
either to the right or to the left of the primary image.
It is the result of transmission conditions where secondary
signals are created and received earlier or later than
the primary signal caused by a reflected RF signal.
Acronym for billions. (G) e.g. One Gigabyte = 1 billion
One billion cycles per second. Signals operating above
3 Gigahertz are known as microwaves. Above 30 GHz they
are know as millimeter waves. As one moves above the
millimeter waves signals begin to take on the characteristics
of light waves. (GHz) 1,000,000,000 Hertz; a unit of
Ground Loop Isolator - Devices, such as Extron's
GLI 250, that isolate the video signals from any system
The slow change of a color's density, a change in tone,
texture, etc., between adjacent areas of an object or
the corresponding image.
User Interface (GUI)
A visual metaphor that uses icons that represent actual
items that can be selected or manipulated with a pointing
A monitor with horizontal scan capable of 15.75 - 75
(80) kHz. Graphics monitors and projectors accept inputs
from NTSC Video, CGA, and VGA, as
well as, high resolution workstations.
Refers to the range of light transmission in a number
of steps, e.g., a 17 step gray scale for a monochrome
product would have white (or very light gray), 15 shades
of gray from light to dark, and black (or very dark
gray) while in a color application, each primary complement
(cyan, magenta, yellow) would vary from white, light
through dark versions of the color, to fully saturated
color. The three combined could make as many as 4,913
(17 x 17 x 17) colors.
A conducting connection by which an electric circuit
or equipment is connected to the earth to establish
and maintain a reference voltage level. Also known as
the voltage reference point in a circuit.
A potential system grounding problem that may produce
symptoms that appear as sync noise and causes a horizontal
bar to "roll" vertically on the video image.
A ground loop occurs when some devices in a system are
not connected to the same electrical ground. This can
create a voltage potential between "ground"
on the different pieces of equipment. See GLI.