video lls the hole. The video signal used for cut and ll
can come from the same, or separate, sources.
Key Alpha
The video signal which cuts a hole in the background
video to make a key effect possible. Also called Key
Video or Source. In practice, this signal controls when
a video mixer circuit will switch from background to key
ll video.
Key Invert
An effect that reverses the polarity of the key source so
that the holes in the background are cut by dark areas of
the key source instead of bright areas.
Key Mask
A keying technique in which a pattern is combined with
the key source to block out unwanted portions of the key
source.
Key Video
A video input which is timed to ll the hole provided by
the key source video. An example of key video is the
video output of a character generator.
Linear Key
Linear keys make it possible to fully specify the
transparency of a key from opaque, through transparent,
to fully off. The transparency is specied by the key
alpha that is associated with the key video. A keyer
capable of a linear key converts the key signal voltage
directly to the transparency effect on the screen.
Mnemonics
A green, orange, or yellow display used to show the
names of a source above or below the source button or
used as a custom command or pattern button.
Offsets
Offsets shift the video signal by a set amount. Depending
on the offset applied, different parts or all of the video
signal may be affected. Clipping occurs if applied offsets
cause output signal values to fall outside the allowable
range.
Pre-Delay
A pre-delay is a delay that is inserted into a transition
between the triggering of a GPI output and performing
the transition. The length of the pre-delay is usually the
length of time your video server requires to start playing
a clip or your character generator required to load a page.
RossTalk
An ethernet based protocol that allows the control over
Ross devices using plain english commands.
Standard-Definition
A standard denition (480i or 576i) video signal.
Self Key
A key effect in which the same video signal serves as
both the key signal and key ll.
Shaped Key
An additive key where the Key Alpha cuts a hole based
on the monochrome value of the alpha. Shades of gray
are translated into either white or black, giving the key
a hard edge. Shaped Key alphas are sometimes used with
Character Generators to cut very precise holes for the
ll.
Split Key
A Split key allows you to assign a different alpha source
for a key than the ll/alpha associations that are set up
during conguration or to use a separate alpha source
for a Self key.
Tally
An indicator which illuminates when the associated
button, or control, is selected or is on-air.
Unshaped Key
A multiplicative key where the Key Alpha cuts a hole
based on the gradient values of the alpha. Shades of gray
are translated into transparency levels, giving the key a
soft edge. Unshaped Key alphas can also be considered
true linear alphas. Key alphas are set to unshaped by
default.
52 • Glossary — Carbonite Setup Manual (v10.0)
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