Extron electronics Matrix 3200 Series User Manual page 64

Component Video – Our color television system starts with three channels of
Composite Sync – A signal consisting of horizontal sync pulses, vertical sync pulses,
Composite Video – A mixed signal comprised of the luminance (black and white),
Contrast – The range of light and dark values in a picture or the ratio between the
Crosstalk – Interference from an adjacent channel which adds an undesirable signal to
Crosstalk Isolation – Attenuation of an undesired signal introduced by crosstalk from an
CRT – Cathode Ray Tube – A vacuum tube that produces light when energized by the
dB – Decibel – The standard unit used to express gain or loss of power. It indicates the
DC – Direct Current – The flow of electrons in one direction.
D Connector – A connector with rounded corners and angled ends, taking on the shape
Decibel – See dB.
Decoder – A device used to separate the RGBS (Red, Green, Blue and Sync) signals
Differential Audio – See Balanced Audio.
Distribution Amplifier (DA) – A device that allows connection of one input source to
FCC – Federal Communications Commission – A unit of the U.S. Government that
Field – In interlaced video, it takes two scans on a screen to make a complete picture, or
Flicker – Flicker occurs when the electron gun paints the screen too slowly, giving the
Frame – In interlaced video, a Frame is one complete picture. A Frame is made up of
Frequency Range – Refers to the low-to-high limits of a device, such as a computer,
Gain – A general term used to denote an increase in signal power or voltage produced
Genlock – A method of synchronizing video equipment by using a common, external
Hertz – Hz – A measure of frequency in cycles per second.
A-7
information; Red, Green, & Blue (RGB). In the process of translating these channels
to a single composite video signal they are often first converted to Y, R-Y, and B-Y.
Both 3-channel systems, RGB and Y, R -Y, B -Y are component video signals. They
are the components that eventually make up the composite video signal. Much
higher program production quality is possible if the elements are assembled in the
component domain.
and equalizing pulses only, with no signal reference level.
chrominance (color), blanking pulses, sync pulses and color burst.
maximum and the minimum brightness values. Low contrast is shown mainly as
shades of gray, while high contrast is shown as blacks and whites with very little
gray. It is also a TV monitor adjustment which increases or decreases the level of
contrast of a televised picture.
the desired signal.
adjacent channel.
electron beam generated inside the tube. A CRT has a heater element, cathode, and
grids in the neck of the tube, making up the "gun". An electron beam is produced by
the gun and is accelerated toward the front display, or screen surface of the tube.
The display surface contains phosphors that light up when hit by the electron beam.
The CRT is more commonly known as picture tube.
logarithmic ratio of output power divided by input power. A power loss of 3 dB is an
attenuation of half of the original value. The term "3dB down" is used to describe the
"half power point".
of the letter "D". Commonly used in computers and video.
from a composite video signal.
multiple output sources such as monitors or projectors.
monitors and regulates communications.
a "Frame". Each scan is called a "Field". Sometimes these are referred to as "field 1
and field 2".
phosphors on the screen time to fade.
two fields, or two sets of interlaced lines.
projector or monitor. Also "bandwidth".
by an amplifier in transmitting a signal from one point to another. The amount of gain
is usually expressed in decibels above a reference level. Opposite of Attenuation.
"Genlock" signal.
Appendix A • Reference Information
Extron • Matrix 3200/6400 Series • User's Manual