Tektronix Grass Valley 3000 User Manual

Page 266

G-4

Glossary

Composite Video:

A video signal which

contains both picture and sync
information. (Also see Encoded Video.)

Control Signal:

A signal used to control

some aspect of switcher operation, such as
video path selection and manipulation,
inter-processor communications, and
variable control (knob) monitoring.

Control Processor:

A circuit or group

of circuits used to generate or alter control
signals.

CPU (Central Processing Unit):

The

section of a computing device that controls
and causes the execution of instructions. A
CPU on a single chip and is called a
microcomputer.

Crosspoint:

An electronic switch,

usually controlled by a pushbutton on the
control panel, that allows video or audio to
pass when the switch is closed.

CRT (Cathode Ray Tube):

A television

or terminal picture tube.

Cut, Take:

A transition between primary

video and/or key video where one signal
is instantaneously replaced by another, or
where one signal is instantaneously added
or removed. (The switch occurs during
the vertical interval so the picture is not
disturbed.)

Debug:

To detect and correct

malfunctions of a computer or errors in a
computer program.

Decoder:

A device used to generate

component video signals from an encoded
video source.

Diagnostics:

A program, usually

resident in the computer, consisting of
several routines which check for
malfunctions and identify faulty
components. (Also see Program and
Routine.)

Downstream Keyer (DSK):

A keyer

that inserts the key “downstream” of the
effects system video output.

Dupe:

A duplicate copy of a videotape, or

to make such a copy.

Duration:

The length of time (in hours,

minutes, seconds and frames) that a
particular effect or event lasts.

DPM:

Digital Picture Manipulator.

EBU Format:

A color difference video

format that uses Y, R-Y, and B-Y
components.

Editor:

A control system (usually

computerized) which allows the control of
video tape machines, video and audio
switchers, and other devices remotely
from a single control panel.

EDL (Edit Decision List):

A record of

edit decisions made for a program (in-
times, out-times, and effects). Often saved
on a floppy disk, it can be used for Auto
Assembly at a later time.