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G-3
Glossary
control is shared between the CPU and
one or more other devices.
Byte: A sequence of bits operated on in
parallel as a unit. The number of bits per
byte is determined by the design of the
computing device – usually 8, 16, or 32.
(Also see Bit and Word.)
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.