Tektronix Grass Valley 3000 - Manual (Page 272)

G-10
Glossary
the same (background) video outside and
inside the outline.
P
PAL (Phase Alternating Line): A
transmission standard for encoded color
television used in Europe and some other
parts of the world. This standard uses a
4.43361875 MHz subcarrier which is
alternated 90 degrees in phase from one
occurrence of a line to the next to minimize
hue errors in color transmission. A single
frame (2 fields) in this standard consists of
625 scanning lines. One frame is produced
every 1/25 of a second. (Also see NTSC.)
Pattern Border: A variable-width
colored border that can be inserted at the
pattern edge in a wipe transition between
two video signals. The border is filled with
matte video from the wipe border matte
generator.
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”