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Glossary
G-10
Pattern Limit: A transition limit in which a
preset position of the pattern edge
between two video signals is stored in
microprocessor memory. Full movement
of the Mix/Effects lever arm or Auto
Transition performs a mix or wipe to or
from the preset limit.
Pattern Modulation: An oscillation or
modulation of the vertical and/or
horizontal dimensions of a wipe pattern
edge.
Port: A connection point between a
computer and another hardware device.
Preset Black Transition, Fade-to-Black: A
transition in which one video signal is
faded to color black before the other video
signal is brought up.
Preset Pattern: The pattern used in a preset
wipe transition.
Preset Wipe: A transition between two
video signals in which the limit of the
separation (pattern edge) between signals
is controlled by the wipe pattern controls.
If the effect is wiped on-air over an
existing background, the transition is
called a wipe to a pattern limit; if the effect
is mixed on-air, it is called a mix to a
pattern limit.
Preview (PVW) Output: The output of the
switcher which allows you to observe an
effect before it is placed on-air. Also called
Look-Ahead Preview.
Primary Inputs: Video and key inputs that
have not passed through any processing
circuits. These sources are selectable by the
Source Select buttons on the main control
panel.
Printer: A device which converts signals
into letters, numbers, symbols, and
graphics for output onto paper. (Also see
Hard Copy.)
Program: A complex sequence of
instructions which tell a computer how to
receive, process, store and transmit
information for a specific task or related
tasks. (Also see Operating Program and
Routine.
Program (PGM) Output: The on-air or final
output of the switcher. May also be a
signal which is available at the “Program”
output of a Mix/Effects system, ready to
be placed (as a re-entry) on the switcher
Program output.
PROM (Programmable Read Only Memory):
An information storage device on which
the information once entered cannot
readily be changed. It is nonvolatile
memory such that power conditions do
not effect the information. (Also see
EEPROM, RAM, and ROM.)
Pulse Regenerator: A circuit which accepts
reference color black or another composite
color video input and processes it to
produce sync, blanking, subcarrier, and
burst flag (PAL only) reference pulses for
use within the switcher.
R
R-Y: The designator used to describe the
Red minus Luminance color portion of a
component video signal.