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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 Although still in use for industrial and educational applications, non-drop frame time code has been replaced by drop frame time code by the television networks and most independent stations.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

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

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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