
Appendix D
♦
Glossary
CMN-41 Series Installation and Operation Handbook
137
Copyright © 2009, Harris Corporation
External Key Input
This is an alternate source for key cut. This is usually a separate
external input to a switcher
Fade-thru-Black
A production technique which is a two step process. The first step
will fade the program video to black. The second step will fade from black to the video
selected on the preview bus. This is usually used in major scene transitions.
Fade-to-Black
A production technique which simply fades the program video to
black and program audio to silent. This is used to end programs and to escape from
embarrassing pictures or sounds.
Field
A picture or picture portion which is produced within one cycle of vertical
synchronization. In interlaced systems, a full picture or frame requires two consecutive
fields.
FM Trap
A circuit designed to minimize potential interference from strong FM signals
in receiving equipment, such as a TV demodulator. For example, an FM trap can
attenuate signals between 88-108 MHz to reduce interference on NTSC television
channel 6.
Frame
A single full resolution picture as viewed in either a video or film system. In
the case of interlaced video, two consecutive fields provide all of the information of
one frame. In non-interlaced systems, one cycle of vertical synchronization produces a
frame. A 60 Hz interlaced system, produces 30 frames of video in one second. A 60 Hz
progressive (or non-interlaced) system, produces 60 frames of video in one second.
Common frame rates are 24 (film) 25, 29.97, 30, 50, 59.94 and 60.
Frame Synchronizer
An electronic device that synchronizes two or more video
signals. Using one input as a reference, it locks a second signal to the reference.
Frame Store
An electronic method of capturing and storing a single frame of video.
Full
A full-screen display of the selected pane (non quad or multi display).
Gamma
This term applies to the linearity of the change from black to white. Gamma
controls adjust the gray or 50% point of the video either up or down, with the effect of
changing the gray level of the video.
Gamut
The whole or total of whatever is being addressed. In color space, gamut refers
to all colors which are included in a particularly defined color group, such as 601
gamut.
Genlock (Generator Lock)
A method of synchronization involving the generation
of a video signal that is time and phase locked with another signal.
GPI
General Purpose Interface
Headend
In a cable TV system, the facilities where program sources (satellite,
terrestrial, VTR, local) are received and remodulated for distribution through a cable
plant.