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Compression A term for the process of reducing the size of a digital file, to help with storage or transmission, through a codec (a compression/decompression formula).
Digital tape Videotape that records a numerical representation of how an electronic signal changes over time. A digital recording is produced from a digital file that may be compressed or decompressed as part of the recording/ duplication process.
Dropout Brief signal loss caused by a tape head clog, defect in the tape, dust, or other factors that cause an increase in the head-to-tape spacing. A dropout can also be caused by missing magnetic material. A video dropout generally appears as a white spot or streak on the video monitor. When several video dropouts occur per frame, the TV monitor appears snowy. The frequent appearance of dropouts on playback is an indication that the tape or recorder is contaminated with debris and/or that the tape binder' deteriorating. It is also an indication that it needs replacement.
Duplication master (dub master) A tape that is used for creating or viewing reference copies. In the case of an analogue tape, a dub master is usually one generation lower than an original recording, edit master, or preservation master. In the case of a digital tape, a dub master may be, for all practical purposes, a 'clone' of the original or master tape.
Format A term used in video for the size, packaging, and sometimes the recording standard of a certain family of videotapes. Tapes that are the same format, though different brands or made by different manufacturers will play back on the same equipment.
Generation A term, typically used with analogue recordings, that commonly refers to the deterioration that occurs between original or master recording and subsequent copies.
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