Appendix D
♦
Glossary
136
CMN-41 Series Installation and Operation Handbook
Copyright © 2009, Harris Corporation
Editor
A device or system which controls video tape recorders, video switchers, and
other related devices in order to electronically splice segments of recorded video into a
finished production.
EDH
Error Detection and Handling. A recommended practice defined in SMPTE RP
165. A system to generate and then detect video data errors in serial digital video
systems.
Effects Keyer
A keyer which is electronically located in the mix/wipe generator
portion of a switcher. The resulting key would appear under the down stream key.
EIA Rack Space or Unit
A specific size as designated by the Electronics Industry
Association. The rack unit is 19 inches wide and is 1.75 inches tall. A device which
requires 3 EIA rack units is 19 inches wide and 5.25 inches (3×1.75 = 5.25) tall.
Elementary Stream (ES)
A generic term for one of the coded video, audio or other
variable length bit streams which are packetized to form MPEG-2 transport streams.
Consists of compressed data from a single source (audio, video, data, and so forth).
One elementary stream is carried in a sequence of PES packets with one and only one
stream ID.
Embedded Audio
Digital audio information multiplexed onto a serial digital data
stream. Up to sixteen channels can be multiplexed on a single stream of digital video,
minimizing cabling and routing requirement.
ENG
Electronic News Gathering
Encoded Clip Softness
In the encoded legalization process, “softness,” as applied
to encoded clips, refers to the processing of the video at the point of the clip. The clips
are applied in YC
B
C
R
color space. The clip point is either an immediate limit (no
softness) or will have a range of values leading to the clip point, all reduced to smooth
the clip point to a less immediate limit (softness).
Encoded Legalization
Limiting of the luminance and color difference signals such
that, once encoded into a composite video signal, the resultant encoded video does not
violate the maximum or minimum signal levels as defined by the specific encoding
rules. NTSC and PAL video plus various users of these types of video have many
varied rules for maximum and minimum encoding limits. Encoded legalization usually
calculates first the encoded luminance value and then the corresponding chroma value
to make legalization judgments.
Encoded Video
A combined single video signal that is constructed from either
separate RGB or luminance and two color difference video signals. NTSC, PAL, and
SECAM are all examples of encoded video.
Envelope Detection
An RF signal detection technique that does not respond to
phase variations in the carrier signal, enabling measurement of a transmitter’s
incidental phase. When used together with synchronous detection, envelope detection
helps isolate either video and/or RF as the causes of phase distortion.
