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Glossary
G-9
Modem: A device that converts signals
from a form compatible with data
processing equipment to a form
compatible with transmission facilities
(such a telephone lines) and vice versa.
Monitor: A device used for viewing video
signals.
Multiplier: An electronic control circuit, the
output of which is the product of a video
input and a control input, or the product of
two control signal inputs.
N
NAB: National Association of
Broadcasters.
Nanosecond (ns): One billionth of a
second.
Noise: Interference present in a video or
audio signal.
Non-Additive Mix (NAM): A transition
between two video signals in which only
the signal with the largest instantaneous
amplitude at any point in the picture is
visible.
NTSC: The U.S. standard for encoded
color TV transmission developed by the
National Television System Committee.
This standard uses a 3.579545 MHz
subcarrier whose phase varies with the
instantaneous hue of the televised color,
and whose amplitude varies with the
instantaneous saturation of the color. A
single frame (picture) in this standard
consists of 525 scanning lines. One frame is
shown every 1/29.94 of a second. (Also see
PAL.)
O
Octal: A numerical notation system using a
base of 8. (Also see Binary and Hex.)
On-Air: The state of a signal which is
present at the switcher Program output.
Operating Program: The complex sequence
of instructions that determines the ability
of a computer to both sequentially and
concurrently run specific programs. (Also
see Program and Routine.)
Outline: A title enhancement in which
only the outline of the key is visible, with
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.