Grass Valley Karrera Video Production Center v.4.0 - Manual (Page 359)

KARRERA — User Manual 359
Glossary
Sync
(1) General term for a synchronizing signal
or signal component. Digital systems gener-
ally employ an analog external timing refer-
ence signal (such as color black or tri-level
sync) to synchronize different pieces of
equipment. Within the digital signal itself,
however, synchronizing information is car-
ried by special digital codes inserted at the
beginning and end of each active line.
(2) In analog television systems, sync is the
portion of the video signal which occurs dur-
ing blanking and is used to synchronize the
operation of cameras, monitors, and other
equipment. Horizontal sync occurs within
the blanking period in each horizontal scan-
ning line, and vertical sync occurs within the
vertical blanking period. A color black signal
is often used for synchronizing different
pieces of analog equipment.
Tally
A light which lights up to indicate that the
associated button has been selected or to in-
dicate that the associated input to the switch-
er is on-air.
Terminate, Termination
To complete a circuit by connecting a resis-
tive load to it.
Transition
A change from one picture to another. Cut,
mix, and wipe are transitions.
User Preference
A collection of control surface configuration
settings available to a user that allows cus-
tomizing of the working environment.
Vertical Interval
The portion of the video signal that occurs
between the end of one field or frame and the
beginning of the next.
Video Fill
A video signal used to fill the hole made by a
key cut signal.
Video Path
The path that video takes through the
switcher.
Wash Matte
A type of matte that contains two elements
rather than a single flat color. For example, a
wash matte can have one color that mixes
gradually across the screen to another color.
Wipe
A transition between two video signals that
occurs in the shape of a selected pattern.
Wipe Pattern Generator
Circuitry that creates patterns that can be
used to create wipe transitions, preset pat-
terns, key masks, and matte washes.
Work Buffer
An active area of memory where the current
effect parameters are stored, allowing the op-
erator to use and modify the effect without
changing the data stored in E-MEM.