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- IEEE-1394
- A fast universal digital interface used for transferring any type of digital information. Also known as FireWire and developed by Apple Computer.
- IMAGE PAC
- Photo CD term which describes the set of five versions of the same image, at varying resolutions.
- IMAGE STABILIZATION
- Camcorder feature which takes out minor picture shakiness, either optically or electronically.
- IMPEDANCE MATCHING
- A video signal occupies a wide spectrum of frequencies, from nearly DC (0 Hz) to 6 MHz. If the output impedance of either the video source, cable or input impedance of the receiving equipment are not properly matched, a series of problems may arise. Loss of high frequency detail and color information as well as image instability, oscillations, snow, ghost images and component heat-up may result. Proper connections and cable types provide correct impedances. (See LOAD RESISTANCE)
- INDEXING
- Creation of a data index to speed up search and retrieval on CD media.
- INSERT EDITING
- Camcorder/VCR feature which allows a user to insert new audio/video segments into the middle of a previously recorded tape. Some camcorders insert both audio and video simultaneously; others can insert audio and/or video separately.
- INTERLACING
- A system developed for television which divides each video frame into two fields (upper and lower). This is done by first drawing one field consisting of an image’s odd scan lines (1, 3, 5... 525) and then drawing the remaining even scan lines (2, 4, 6...), interweaving both fields. Interlacing reduces the perception of screen flicker. Interlacing can cause annoying effects with images such as computer generated text and graphics when transferred to video.
- ISO 9660
- An international standard defining the file and directory structures for CD-ROM. It defines such items as file naming conventions and subdirectory levels, etc. An ISO 9660 formatted CD-ROM will function on any computer platform containing the appropriate driver software. ISO 9660 data starts at track time 00:02:16 or sector 166 (logical sector 16) of track one. For a multisession disc, the ISO 9660 data will be present in the first data track of each session containing CD-ROM tracks.
- ISO 9660 FORMAT
- An international standard specifying the logical format for files and directories on a CD-ROM.
- ISO 9660 IMAGE
- (Also CD-ROM image, image, disc image). A single large file which is an exact representation of the whole set of data and programs as it will appear on a CD, in terms of both content and logical format.
- ISO 9660 w/Rockridge Extensions
- A revision to the ISO specification to allow for UNIX specific exceptions to the ISO 9660 standard.
- ISO INTERCHANGE LEVELS
- There are three methods of recording and naming files on disc under the ISO 9660 standard. There are three nested, downward-compatible Levels.
In Level 1 (the most restrictive):
- Each file must be written on disc as a single, continuous stream of bytes - files may not be fragmented or interleaved.
- A filename may not contain more than eight d-characters.
- A filename extension may not contain more than three d-characters.
- A directory name may not contain more than eight d-characters.
In Level 2, again, each file must be written on disc as a single, continuous stream of bytes.
In Level 3 there are no restrictions.
- ISRC (International Standard Recording Code)
- A unique identifying designation usually assigned by the issuing record company for each audio track on a compact disc. The code is made up of: Country Code (2 ASCII characters), Owner Code (3 ASCII characters), Year of Recording (2 digits) and Serial Number (5 digits).
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