Imagine Videotek LLM-1770, Installation And Operation Manual

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Appendix C
Glossary
86
Blanking Processor. A circuit which removes sync, burst and blanking from the program
video and then replaces it with sync, burst and blanking from the reference input. The
process ensures constant sync and burst levels on program video.
Border. An electronically-generated picture member which is used in wipes to separate the
two video sources used in the wipe. It is of even thickness and has color produced by the
matte generator.
Broadcast Legal. Encoding video signal parameters to conform to prescribed limits for
broadcast. Encoding rules vary by NTSC, PAL, country and broadcast facility.
BTSC. Broadcast Television Standards Committee. A US standard for stereo audio encoding
in NTSC broadcast television.
CAV. Component Analog Video
CDP. Caption Distribution Packet
CES. Consecutive Errored Samples
Composite Video. A single video signal that includes all color video and timing
information. A composite signal includes luminance, chrominance, blanking pulses, sync
pulses and color burst information.
Chrominance. The color portion of a video signal that represents the saturation and hue.
Black, gray and white have no chrominance; color signals have both chrominance and
luminance.
CH. Chroma
Chrominance/Luminance Delay. A measurement that indicates the amount to which
chrominance and luminance are aligned with respect to each other. A low C/L delay figure
can minimize the effects of ghosts or color offset on the received picture.
C/L Delay. Chrominance/Luminance Delay
Clipping. The electronic process of shearing off the peaks of either the white or black
excursions of a video signal for limiting purposes. Clipping is often performed prior to
modulation to limit the signal.
CMRR. Common Mode Rejection Ratio
Color Burst. The portion of a color video signal which contains a short sample of the color
subcarrier. It is used as a color synchronization signal to establish a reference for the color
information following it and is used by a color monitor to decode the color portion of a
video signal. The color burst acts as both amplitude and phase reference for color hue and
intensity. The color oscillator of a color television receiver is phase locked to the color burst.
Composite Sync. A signal consisting of horizontal sync pulses, vertical sync pulses and
equalizing pulses only.
CRC. Cyclical Redundancy Check
Crosspoint. An electronic switch, usually controlled by a button on the panel. Control logic
will allow for only one crosspoint, for each bus, to be switched “ON” on at a time.