Tektronix 2200 Manual Do Utilizador
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.
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.
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.
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.)
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.)
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.
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.)
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.
edge in a wipe transition between two
video signals. The border is filled with
matte video from the wipe border matte
generator.