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Glossary
G-3
C
Caption: See Title.
Character Generator: An electronic device
that produces letters, numbers, and
symbols for video output.
Chroma: The attribute of light combining
hue and saturation, independent of
intensity. The color perceived is
determined by the relative proportions of
the three primary colors.
Chroma Key: A key effect in which the key
signal is derived from the chroma
information (hue and saturation) of the
key source.
Chroma Key Shadow: A video effect in
which the shadows in a keyed-out portion
of a picture can be restored on the
background of the composite picture.
Chrominance: The colorimetric difference
between any color and a reference color of
equal luminance. Chrominance
corresponds to the sensation of saturation.
CIE Colors: A color standard
recommended by the IEEE.
Clip: A threshold level adjustment to
which the key source attribute (luminance,
chrominance, etc.) is compared for
generating the internal key signal. The
(CLIP) control sets the switching point
between the background and the fill.
CMOS (Complementary Metal Oxide
Semiconductor): A family of
semiconductors characterized by low
power consumption.
Color Bars: Standard color test signal of
(usually) eight colors.
Color Black: A video signal in which the
luminance is at the Black reference level.
Color Burst: A nine-cycle (NTSC) or ten-
cycle (PAL) burst of subcarrier on the
video signal which serves as the reference
for establishing the picture color.
Color Difference Signal: A video signal
conveying only color information such as
R-Y and B-Y.
Color Frame: The video frame polarity. In
order to keep the video signal in phase,
color frames must alternate polarity with
each frame.
Component: A part of an assembly. (Also
see Assembly and System.)
Component Video: A set of video signals
(usually three), each of which represents a
portion of the information needed to
generate a full color image.
Composite Video: A video signal which
contains both picture and sync
information. (Also see Encoded Video.)
Control Signal: A signal used to control
some aspect of switcher operation, such as
video path selection and manipulation,
inter-processor communications, and
variable control (knob) monitoring.