CMN-91
Appendix C
Installation and Operation Manual
Glossary
© 2016 Imagine Communications Corp. Proprietary and Confidential.
Revision D | Page 183
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 On VTM Series units, 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
GPS Global Positioning System
GPS Time Global Positioning System time, is the atomic time scale implemented by the atomic clocks in
the GPS ground control stations and the GPS satellites themselves. GPS time was zero at 0h 6-Jan-1980.
It is not perturbed by leap seconds.
GRB Legalization Limiting of luminance and color difference video signals such that, once transcoded
into GRB component video signals, the resultant video does not violate the maximum or minimum signal
levels as defined by component video level rules. Typically, the maximum value for R, G, or B is 700 mV,
and the absolute minimum value for any of these signals is 0 mV.
