Grass Valley Indigo AV Mixer v.1.2.2 - Manual (Page 170)

170 INDIGO AV Mixer User Manual
Glossary
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, syn-
chronizing 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 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.
T
T-Bar
See Transition Lever Arm.
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.
Touch Screen
A screen with a touch-sensitive film on top,
allowing a user to touch areas of the screen to
press buttons and move sliders.
Transition
A change from one picture to another. Cut,
mix, and wipe are transitions.
Transition Lever Arm
A hand gear to manually execute transitions.
V
Vertical Interval
The portion of the video signal that occurs
between the end of one field or frame and the
beginning of the next.
VDR (Video Disk Recorder)
A video recorder and playback device using
hard disk storage in place of video tape.
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.
W
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.