Glossary
Auto
Transition
A transition having a predefined duration generally initiated by pressing a control panel
button.
Aspect The ratio of a picture’s horizontal and vertical dimensions when correctly displayed (4:3,
16:9).
Background
Bus
Background
Transition
Background
Video
Backing
Color
A row of buttons on an M/E used to select background video signals. Typically labeled A and
B, with A representing the current output, and B representing the next output.
A transition between the background video signals selected on an ME.
Video that forms a background scene into which a key may be inserted.
Backing Color
The color in a chroma key scene that will be replaced with another video signal.
Bit Rate
The number of bits per second passed from one point to another.
Black A black video signal generated within the switcher.
Box Wipe
A rectangular wipe pattern. For masking, the GV Switcher system provides a special box
wipe pattern generator allowing independent control of the placement of each side of the
box.
Chroma The depth or saturation of color. Chroma, hue, and luminance make up the three
characteristics of television color.
Chroma Key
A video key effect in which one video signal is inserted in place of areas of a particular color
in another video signal. Blue and green are the chroma key colors most frequently used.
Clean Feed
A final output of the switcher that does not include downstream key effects or fade to black.
Also see Programmable Clean Feed.
Clip A threshold level adjustment to which the keying attribute (luminance, chrominance) is
compared for generating the internal key control signal. Clip, in conjunction with gain, sets
the switching point between the background and the key fill. Also see Gain.
Clip High,
Clip Low
An alternative to Clip and gain keying, providing independent control of the points where
the background video and the key fill video are each fully visible.
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