Tektronix Grass Valley 3000 User Manual

Page 268

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.

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):

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.

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.