Glossary
- A-Time:
- Absolute Time. Elapsed time, referenced
to the program start (00:00:00), on a CD or R-DAT. A-Time is measured in minutes, seconds,
and frames.
- Authoring:
- Creation of a database for a CD-ROM. The
end product of authoring is usually a search and retrieval type document with the addition
of a user interface. Specific authoring functions include tagging and indexing.
- CD-I:
- Compact Disc Interactive. An interactive
multimedia system which connects to a television. The CD-I standard is known as the Green
Book.
- CD-ROM/XA:
- CD-ROM Extended Architecture. A standard
which allows interleaving of compressed audio and video data for synchronization purposes.
- ECC/EDC:
- Error Correction Code/Error Detection
Code. Codes specified in the color book standards and imbedded in CD data which facilitate
the reconstruction of data if read errors occur.
- HFS:
- Hierarchical File System, used by the
Macintosh platform. HFS formatted CD-ROMs have the same file structure as an Apple hard
disk.
- Hybrid Disc:
- A CD-ROM which can function on either
the PC or the Macintosh platform. The disc contains separate ISO 9660 and HFS partitions.
- Indexing:
- Creation of a data index to speed up
search and retrieval.
- ISO 9660:
- An international standard defining the
file and directory structures for CD-ROM. An ISO 9660 formatted CD-ROM will function on
any computer platform containing the appropriate driver software. Most common with PC
compatible systems
- 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.
- Mixed
Mode Disc:
- A CD-ROM that contains both a computer
data track (#1) and audio tracks (#2-99)
- Mode 1:
- Most common CD-ROM data format. Contains
three layers of error correction for computer data.
- Mode 2:
- CD-ROM data format with two layers of
data correction for audio and compressed video. Utilized in CD-ROM/XA.
- 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 CD-ROM, including file structure (i.e. ISO 9660) and
file locations. A premastered image is ready to be mastered and replicated.
- SMPTE Time:
- Time code adopted for use with the
3/4" U-matic tape used in CD Production. Originally used for video, this was devised
by the Society of Motion Picture and Television Engineers.
- Tagging:
- Placing hidden markers in text to
indicate where to insert specific images.
- Transfer
Rate:
- The amount of data which is transferred
from the CD-ROM to the computer. The CD-ROM transfer rate is limited by the speed at which
the disc rotates in the drive. The conventional CD-ROM transfer rate is approximately 150
kilobytes/sec, referred to as 1x. Therefore, a quadruple speed (4x) CD-ROM drive can
transfer data at a rate of 600 KB/sec.
- Yellow Book:
- International standard which defines the
physical properties of a CD-ROM disc.
 How CD data
structures are formed
CD Readback System
How
"real" computer data is generated from a CD-ROM
CD Manufacturing
Glossary
CD Overview
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