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DVD Glossary
A-Time:
Absolute Time. Elapsed time, referenced to the program start (00:00:00), on a DVD. A-Time is measured in minutes, seconds, and frames.
AC-3:
A six-channel digital audio format; its official name is Dolby Digital Surround Sound System.
Artifacts:
Interference or other unwanted "noise" in video such as flickering or changes in color.
Aspect ratio:
The dimensions of the image. A "typical television" ratio is 4 X 3 (also known as 1.33 X 1). Many motion pictures, and some new TVs, have a 16 X 9 format (also known as 1.78 X 1).
Authoring:
Creation, combining and setup of a various files for a DVD video, DVD-ROM, or audio disc. This includes audio, video, graphics and text files. The end result is a DLT tape with DVD image files and DDP descriptor.
Bit rate:
The rate at which bits of data are encoded on the disc. A typical bit rate is 3.5 Megabits per second.
CBR:
Constant bit rate compression. This indicates that in the encoding process the bit rate does not change, despite the simplicity or complexity of the image being encoded. (See VBR).
Chapter stop:
Programming that allows a viewer to jump immediately to a particular part.
Compress:
To reduce or compact audio or video information so that it can more easily be stored or transmitted.
CSS:
Content scrambling system, a type of Digital copy protection sanctioned by the DVD Forum.
DDP:
Disc Description Protocol is a small file(s) which describe how to master a data image file for optical disc(DVD or CD). This is ANSI industry standard developed by Doug Carson and Associates. This information is used in the mastering process by the Laser Beam Recorders.
DLT:
Digital Linear Tape, a high storage capacity (10-20 Gbytes) tape used as the input medium to master DVD. Media designated "type III" or "type IV" tapes are used for DVD.
DVD-5:
DVD format in which 4.7 Gigabytes of data are stored on one side of the disc in one layer.
DVD-9:
DVD format in which 8.5 Gigabytes of data are stored on one side of the disc in two layers.
DVD-10:
DVD format in which 9.4 Gigabytes of data are stored on two sides of the disc in one layer each.
DVD-18:
DVD format in which 17.0 Gigabytes of data are stored on two sides of the disc in two layers each.
Decompress:
To change audio and video information from a compacted form to its original state.
ECC/EDC:
Error Correction Code/Error Detection Code. Codes specified in the color book standards and imbedded in DVD data which facilitate the reconstruction of data if read errors occur.
Indexing:
Creation of a data index to speed up search and retrieval.
LBR:
Laser beam recorder. It creates the DVD master disc.
Macrovision:
An analog protection scheme developed by Macrovision for the protection of analog copying. It is widely used in VHS and has now been applied to DVD.
Media Conversion:
The process of converting data from one type of media to another for premastering and mastering. Premastering software typically requires input data on hard disk. 8mm tape and compact disc are preferred as input media for the mastering process.
MPEG1, MPEG2:
Standards for compressing video. MPEG stands for Moving Pictures Expert Group.
NTSC:
National Television Systems Committee, which devised the standards for TV broadcasting in the United States, Canada, Japan, and a few other countries. (See PAL)
PAL:
Phase Alteration Line. A standard for TV broadcasting in Europe, Australia and New Zealand, and other countries. (See NTSC)
Pan & Scan:
A method of transferring movies with an aspect ratio of 16 X 9 to film, tape, or disc to be shown on a conventional TV with a 4 X 3 aspect ratio. Only part of the full image is selected for each scene. Pan & Scan is the opposite of "letterbox" or "widescreen."
Pit Art:
A type of DVD labeling in which the pits are cut in a design to resemble writing or another image.
PQ Information:
Information on the disc (or tape) that determines track start points, control bits, timing information, etc.
Premastering:
The process of formatting data into the exact image that will appear on a DVD, including file structure and file locations. A premastered image is ready to be mastered and replicated.
Regional Coding:
Copy-protection coding built into a DVD disc that allow it to be played, or prevent it from being played, in one or more regions of the world. For this purpose, the world is divided into six regions.
Subpicture information:
Captions, subtitles, or other text that can be displayed or hidden.
Substrate:
A DVD half-disc. Two substrates, each 0.6 mm thick, are bonded together to form a 1.2 mm thick DVD disc.
Tagging:
Placing hidden markers in text to indicate where to insert specific images.
Telecine process:
The process of turning film into video.
VBR:
Variable bit rate compression. This indicates that in the encoding process the bit rate changes, depending upon the simplicity or complexity of the image being encoded. (See CBR).
 
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1767 Sheridan Street
Richmond, Indiana  47374

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Phone:  800.704.7648
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