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Glossary
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Switched
Preview
A special output of the system connected to a dedicated monitor. The operator can select
and switch various system video signals to that output to preview them.
Sync
1) General term for a synchronizing signal or signal component. Digital systems generally
employ an analog external timing reference signal (such as color black or tri-level sync) to
synchronize different pieces of equipment. Within the digital signal itself, however,
synchronizing information is carried 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 during
blanking and is used to synchronize the operation of cameras, monitors, and other
equipment. Horizontal sync occurs within the blanking period in each horizontal scanning
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 indicate
that the associated input to the switcher is on-air.
Terminate,
Termination
To complete a circuit by connecting a resistive load to it.
Transition
A change from one picture to another. Cut, mix, and wipe are transitions.
User
Preference
Vertical
Interval
A collection of control surface configuration settings available to a user that allows
customizing of the working environment.
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 patterns,
key masks, and matte washes.
Work Buffer
An active area of memory where the current effect parameters are stored, allowing the
operator to use and modify the effect without changing the data stored in E-MEM.