Extron electronics Matrix 200 User Manual page 77

Breakaway – The ability to separate audio and video signals for the purpose of switching them
Brightness – Usually refers to the amount, or intensity of video light produced on a screen.
Buffer – Generally referred to as a unity gain amplifier used to isolate the signal source
Cable Equalization – The method of altering the frequency response of a video amplifier to
Capacitance – The storing of an electrical charge. At high frequencies, capacitance that exists
Chroma – The characteristics of color information, independent of luminance intensity. Hue
Chrominance Signal – Part of a television signal containing the color information. Abbreviated by "C".
Coaxial Cable – A two-conductor wire in which one conductor completely wraps the other with the
Color – An Extron adjustment that is used to control color intensity.
Component Video – Our color television system starts with three channels of information; Red,
Composite Sync – A signal combining horizontal and vertical sync pulses, and equalizing pulses,
Composite Video – An all-in-one video 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, usually from an adjacent channel, which adds an undesirable signal
Crosstalk Isolation – Attenuation of an undesired signal introduced by crosstalk.
CRT (Cathode Ray Tube) – A vacuum tube that produces light on a screen when energized by the electron
A-5
Appendix A • Part Numbers, Glossary and Troubleshooting
independently. For example: an audio and video signal from the same source
may be "broken away" and switched to different destinations. This is the opposite
of the term "audio follow".
Sometimes called "black level".
from the load. This is for both digital and analog signals.
C – In S-Video, "C" is an abbreviation for Chrominance, or the color information. ("Y"
is for Luminance, or the brightness.)
compensate for high frequency losses in cables that it feeds. (See Peaking.)
in cables also represents a form of impedance.
and saturation are qualities of chroma. Black, gray, and white objects do not
have chroma characteristics.
two separated by insulation. Constant impedance transmission cable.
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.
with no picture information. Sometimes called "C", "S" (as in RGBS) or "HV".
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 displayed picture. Also called "white level".
to the desired signal.
beam from 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 screen surface of the tube. The screen's
inside surface is coated with phosphors that light up when hit by the electron
beam. The CRT is more commonly known as the picture tube. Some color CRTs
have three guns – for red, green and blue colors.
Extron • Matrix 200 • User's Manual