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Glossary
G-12
Split Key: A key mode in which the key
signal and the key video are from different
sources.
Spotlight: A highlight effect produced by
superimposing a full-strength video signal
shaped by a wipe pattern over an
attenuated (darkened) signal from the
same video source.
Subcarrier: A sine wave signal which is
imposed on a video signal as a color
reference. Subcarrier also forms color
burst. The frequency of subcarrier is 3.58
MHz in NTSC and 4.43 MHz in PAL.
Switcher (Vision Mixer): An electronic
device that takes video signals from any of
several sources (such as cameras, VTRs,
character generators, etc.) to combine
video signals and produce video effects.
(Also see Audio Mixer.)
Sync: The portion of an encoded video
signal which occurs during blanking and
is used to synchronize the operation of the
equipment. Horizontal sync occurs during
the blanking period in each horizontal
scanning line, and vertical sync occurs
during the vertical blanking period.
Synchronous: A mode of computer
operation where all tasks, regardless of the
time they take for execution, are allotted
specified time cycles. (Also see
Asynchronous.)
System: A grouping of assemblies which
perform multiple related tasks. (Also see
Assembly and Component.)
T
Terminate, Termination: To complete a
circuit by connecting a resistive load to it.
A video termination is typically a male
BNC connector which contains a 50-ohm
or 75-ohm resistive load. Any unused
looping inputs must be terminated to
ensure proper signal levels.
Time Base Corrector: An electronic device
used to correct video signal instability.
Title, Caption, Title Key: A key derived
from a title signal generated by a character
generator, graphics camera, etc. The title
fill may be either a matte or title video.
Transcoder: A device for converting one
component form to another, as in RGB to Y,
R-Y, B-Y. Also called a translator.
Transition: An operation which changes
backgrounds and/or adds or removes
titles. A transition can be in the form of a
wipe, mix, or cut.
V
Vertical Interval: The portion of the video
signal that occurs between the end of one
field and the beginning of the next. During
this time, the electron beams in the
monitors are turned off so that they can
return from the bottom of the screen to the
top to begin another scan.
Video: An electrical signal used to carry
visual information. Composite video
includes sync and blanking signals.
Noncomposite video does not include
sync and blanking.