Glossary Of Terms - Extron electronics System 8 Plus User Manual

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Glossary of Terms

Glossary of Terms
ADA – Analog Distribution Amplifier – A device that takes in one signal and distributes it
Adapter – A linking device which allows two dissimilar devices to connect physically, and/or
AMPS – (Amperes) A unit of measurement for current.
Analog (Analogue) – A continuous action, or movement that takes time to change from one position to
ANSI – American National Standards Institute
ASCII – American Standard Code for Information Interchange. The standard code
Aspect Ratio – The relationship of the horizontal dimension to the vertical dimension of a
Attenuation – The decrease in magnitude (of a signal).
Audio Follow – A term used when audio is tied to other signals, such as video, and they are
Balanced Audio – A method that uses three conductors for one audio signal. They are plus (+),
Bandwidth – A frequency range, or "band" of frequencies, within which a device operates. In
Black Level – More commonly referred to as "brightness", the Black Level is the level of light
Blanking – The turning off of the electron beam that scans the image onto the screen. When
Blooming – Most noticeable at the edges of images on a CRT, "blooming" is when the light
BNC – It is a cylindrical Bayonet Connector which operates with a twist-locking motion.
Breakaway – The ability to separate audio and video signals for the purpose of switching them
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AC – Alternating Current –
Flow of electrons that changes direction alternately.
to several outputs without "tying" those outputs together (buffered).
communicate electronically.
another. Standard audio and video signals are analog. An analog signal has an
infinite number of levels between its highest and lowest value. (Not like digital,
where changes are by steps.)
consisting of 7-bit coded characters (8 bits including parity check), utilized to
exchange information between data processing systems, data communication
systems, and associated equipment. The ASCII set contains control characters
and graphic characters.
rectangle. In viewing screens, standard TV is 4:3, or 1.33:1; HDTV is 16:9, or
1.78:1. Sometimes the ":1" is implicit, making TV = 1.33 and HDTV = 1.78.
switched together. (The opposite of Breakaway)
minus (-) and ground. The ground conductor is strictly for shielding, and does not
carry any signal. Also called Differential Audio.
audio and video, it is the band of frequencies that can pass through a device
without significant loss or distortion. The higher the bandwidth, the sharper the
picture; low bandwidth can cause a "fuzzy" picture.
produced on a video screen.
the beam completes a scan line it must return (retrace) back to the left. During
this time, the beam must be turned off (horizontal blanking). Similarly, when the
last line has been scanned at the bottom of the screen, the beam must return to
the upper left. This requires vertical blanking.
hitting the screen phosphors is so intense that it overdrives them. The edges of
an image seem to exceed its boundaries. Thin lines and sharp edges may look
thick and fuzzy. This may be caused by the brightness being set too high, or by a
high voltage problem.
Two curved grooves in the collar of the male connector are aligned with two
projections on the outside of the female collar. This allows the connector to be
locked in place without the need of tools.
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".
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Reference
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