Glossary - GRASS VALLEY Ignite SDC Series Instruction Manual

Glossary

A
Aspect
The horizontal and vertical display dimen-
sion ratio of a picture; i.e., the width divided
by the height (usually expressed as x:y). The
aspect ratio of a traditional standard defini-
tion (SD) television screen is 4:3, or 1.33:1.
High definition (HD) television uses an as-
pect of 16:9 (5 1/3 to 3), or about 1.78:1.
B
Bit Rate
The number of bits per second passed from
one point to another.
Black
A black video signal generated within the
switcher.
C
CCD (Charge-Coupled Device)
An image sensor used in digital photogra-
phy.
CCFL (Cold-Cathode Fluorescent)
CCFL tubes are used for backlighting an
LCD display.
Chroma
The depth or saturation of color. Chroma,
hue, and luminance make up the three char-
acteristics of television color.
Chroma Gain (chroma, color, saturation)
The gain of an amplifier as it pertains to the
intensity of colors in the active picture.
Ignite Glossary
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 back-
ground and the key fill. Also see Gain.
Component Video
A video signal that keeps color and lumi-
nance information separate. RGB; Y, R Y, B Y;
and Y, Cr, Cb are examples of component
video.
Composite Video
An encoded video signal that combines color
information with luminance information.
NTSC, PAL, and D 2 are examples of com-
posite video.
D
E
Ethernet
A form of high speed data transport between
devices on a network.
F
Field
One scan of an interlaced video image. In in-
terlace systems, two fields are required to
make a complete picture (video frame) be-
cause alternate lines are scanned. Also see
Frame
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