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G-6
Glossary
Fill or Insert Video: The video or matte
signal used to fill the holes cut in the
background video by the key signal.
Firmware: Physical devices (integrated
circuits) that house computer programs.
(Also see Hardware and Software.)
Flag: A bit of information used to tell the
program that some condition has
occurred.
Flip-Flop: A transition in which the
video sources selected on the background
buses exchange places at the end of the
transition; for example, the source selected
on A Background becomes selected on B
Background, and the source selected on B
Background becomes selected on A
Background.
Floppy Disk: An electronic device which
is capable of storing data and programs for
ease of retrieval and use by a computer.
(Also see Hard Disk.)
Frame: One complete video picture
consisting of two interleaved fields. In the
NTSC system, one frame makes up a
complete TV scanning cycle (1/30th of a
second). In the PAL system, two frames (at
1/25th of a second) are required to make
up a complete TV scanning cycle.
Frame (hardware): The metal cabinet
which contains the switcher's circuit
boards.
Frame Lock: Synchronization of the
video signal with a time code.
Freeze Frame: The recording or storage
of a single frame of video.
Front Porch: The portion of the video
signal that occurs during blanking and
extends from the end of active video to the
beginning of sync.
G
Gain: An amplification adjustment of the
key source attribute (chrominance, hue,
luminance, etc.) to be used for keying. The
GAIN control affects the sharpness of the
key edge.
Generation: The number of times
removed a dupe is from the original
videotaped material. A copy of the
original is a second generation tape, and
so on.
GPI (General Purpose Interface): An
electronic device containing several
electronic switches that can be activated
by a remote data signal. GPIs allow the
editing system to control various remote
components.
Gray Scale: Range of luminance levels
from black to white.
H
Halo Border: A soft wipe pattern border
which is mixed with different softness on
each of the two edges to give a halo effect.
Hard Copy: A print out on paper of data
contained on another medium, such as a
monitor or disk.