Noise, Video
A random signal generated by most electronic equipment,
which is present throughout the video signal spectrum.
Video noise is somewhat analogous to film grain.
In a home receiver, it is most obvious in the transmitted
signal in weak reception areas.
Non-Drop
Frame Time Code
A time-based reference system for video and audio
that was developed and standardized by the SMPTE.
The system assigns each frame a distinct eight-digit
number that is composed of hours, minutes, seconds,
and frames.
Because of the nature of the
NTSC color television system, non-drop frame time
code does not agree with clock time. Non-drop
frame time code indicates 3.6 seconds less than
one hour of clock time video information. Although
still in use for industrial and educational applications,
non-drop frame time code has been replaced by
drop frame time code by the television networks
and most independent stations. See Drop
Frame Time Code. topˆ
Nonlinear
Video Editing
See Linear
vs. Nonlinear Video Editing. topˆ
NTSC
National Television Standards Committee. A committee
formed in the late 1930’s that formulates,
recommends, and approves standards for television
in the United States and other countries using
the NTSC system.
One of three television standards used world wide,
the others being PAL and SECAM. The NTSC standard
is used in North America, much of South America,
Japan, and South Korea, among other countries.
NTSC is a black-and-white and color compatible
525-line system that scans a nominal 30 interlaced
television picture frames per second. topˆ
Offline
Editing
The work print or decision making stage of videotape
editing. The resulting tape is not considered
to be a broadcast quality master but is used to
create program continuity and generate accurate
time code data that will be stored and used after
to conform a master quality tape from unedited
production material. An offline work print may
have visible time code numbers burned into the
picture area for reference. This is called a window
dub. topˆ
Online
Editing
The last stage of videotape editing, resulting
in a final master tape. The equipment used during
online editing is generally designed to produce
broadcast quality tapes and costs much more than
the equipment used in offline editing. Online
editing rates are about three to four times those
of offline editing.
Nearly all online editing is
performed on one-inch videotape. These VTRs are
capable of slow motion, still-framing with broadcast
quality and search and wind at 50 times play speed.
topˆ
Optical
Disk
Also referred to as a laser disk. A semi-rigid
plastic disk containing aluminum or other substrate
in which a laser beam embeds digital data, allowing
information to be stored. The substrate itself
is sandwiched between plastic to prevent damage
to the data when the disk is handled. The most
commonly used is the WORM disk, meaning "Write
Once, Read Many." topˆ
Pairing
A random failure of field interlace in which the
scan lines of both the odd and even fields fall
directly on top of one another. This form of video
distortion reduces the picture resolution. The
problem may be eliminated by adjusting the vertical
hold control until interlace becomes apparent.
See Interlace.
topˆ
Pan and
Scan
See Telecine
Formats. topˆ
Phase,
Color
See Hue.
topˆ
Primary
Colors
In television, the colors red, green, and blue.
These colors are additive in nature and when missed
in the correct proportions, produce white light.
Color film uses dye images to create color and
thus requires the subtractive primary colors yellow,
magenta, and cyan. topˆ
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