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video conference
téléconférence f

Video conference. A name given to a discussion between two or more groups of people who are in different places but can see and hear each other. The image and sound are transmitted via a telecommunications network, and these conferences are held across the world via satellites.

video disk
vidéodisque m

Video disc. See optical disk.

video signal
signal m vidéo

Video signal. In a television set, it is the signal that provides the image, although it must be separate from the sound in the case of television transmission that enters through the antenna socket. Most microcomputers display their output on a television set via the antenna socket, although to get a more specific image one must use a monitor that accepts a video signal, and this signal has a lower frequency than the ultra-high frequency (UHF) aerial signal. Some VCRs have a composite video output, so many television receivers are now made with video inputs in addition to UHF. However, to get the clearest color picture, the red, green, and blue video signals must be sent separately from each other, which requires both a red-green-blue computer output and a corresponding video monitor.


video text
vidéotex m

Video text. A name given to any information service that can display text on a television screen. The code can be sent as part of a television image (teletext) or as an encoded telephone signal (view data). A typical page contains 24 lines of 40 characters each.

Video text
Visual data
Teletext
Other special systems
Prestel
Oracle
Syfax

view data
visual fpl données

Visual data. A selection service for information in the form of pages or frames that the user can call up from an anonymous terminal or digital touchpad. The pages are sent over telephone lines from a central computer or directly from the information resource (IP). The information is a structural part of a tree system, with each frame having clear and well-defined links down from the root. Users can access pages by moving up and down a specific path from the root via on-screen options decided upon at the digital touchpad.
Some types of visual data now allow interaction with users (two-way communication), allowing the development of remote shopping, banking and reservation services.

virtual memory
virtual memory. A facility available in modern mainframes where the programmer is not restricted by the size of the machine's memory. The machine converts virtual locations specified by the programmer into backing stores to provide additional memory space.

virus
virus m

A term given to major errors that can infect operating systems as a result of illegal copying of software or bugs.

visual display unit (VDU)
terminal m de visualisation

Visual display unit. A device such as a television set used to display computer output. It is very similar to a monitor except that it is usually accompanied by a touch panel, and is often used as a computer terminal, sometimes remotely.

VLSI

Abbreviation for very large-scale integration.

voice input
entrée f vocale

voice input. Operating a device controlled by a microprocessor not by pressing buttons on a touchpad but by speaking through a microphone. This device may be mechanical, electrical or electronic, and machines can now accept a number of words provided that they are pronounced clearly.

volatile memory
mémoire f volatile

Volatile memory. This term refers to all types of memories that lose their stored data as soon as the power is cut off.

For example: the core store and RAM chips are considered volatile memories, while the magnetic disk and bubble memory are not.