video adapter
graphics adaptor
Nearby terms:
VHS « vi « VIC-20 « video adapter » video
card » Video Compact Disc » video compression
video card
graphics adaptor
Nearby terms:
vi « VIC-20 « video adapter « video card »
Video Compact Disc » video compression » video
conference
Video Compact Disc
<storage> (VCD) A storage format used for film distribution.
[Details? Relationship to audio CD?]
(2004-02-15)
Nearby terms:
VIC-20 « video adapter « video card « Video
Compact Disc
» video compression » video conference » video
conferencing
video compression
Compression of sequences of images. Video compression algorithms use the fact
that there are usually only small changes from one "frame" to the next so they
only need to encode the starting frame and a sequence of differences between
frames. This is known as "inter-frame coding" or "3D coding".
MPEG is a committee producing standards in this area and also the name of their
standard algorithm. H.261 is another standard.
See also Integrated Information Technology, 3DO, full-motion video, Online
Media.
Nearby terms:
video adapter « video card « Video Compact Disc «
video compression » video conference » video
conferencing » video dial tone
video conference
An instance of video conferencing.
Nearby terms:
video card « Video Compact Disc « video compression
«
video conference » video conferencing » video
dial tone » video display terminal
video conferencing
<communications> A discussion between two or more groups of people who
are in different places but can see and hear each other using electronic
communications. Pictures and sound are carried by the telecommunication network
and such conferences can take place across the world.
To overcome the bandwidth and latency limitations of current networks
(especially the PSTN), some form of video compression is often used.
(1995-05-01)
Nearby terms:
Video Compact Disc « video compression « video
conference «
video conferencing » video dial tone » video
display terminal » Video Electronics Standards
Association
video dial tone
<communications> A means by which telephone companies can deliver
"television" programs on a common carrier basis and, by law, provide equal
access to all.
[What does this mean?]
(1996-12-01)
Nearby terms:
video compression « video conference « video
conferencing «
video dial tone » video display terminal » Video
Electronics Standards Association » Video Graphics
Adapter
video display terminal
visual display unit
Nearby terms:
video conference « video conferencing « video dial
tone «
video display terminal » Video Electronics
Standards Association » Video Graphics Adapter »
Video Graphics Adaptor
Video Electronics Standards Association
<body, standard> (VESA) An industry standards organisation created in
1989 or 1990 mostly(?) concerned with IBM compatible personal computers. The
first standard it created was the 800 x 600 pixel Super VGA (SVGA) display and
its software interface. It also defined the VESA Local Bus (VLB).
See also PCI.
Home.
(1995-11-16)
Nearby terms:
video conferencing « video dial tone « video display
terminal « Video Electronics Standards
Association » Video Graphics Adapter » Video
Graphics Adaptor » Video Graphics Array
Video Graphics Adapter
Video Graphics Array
Nearby terms:
video dial tone « video display terminal « Video
Electronics Standards Association « Video
Graphics Adapter » Video Graphics Adaptor »
Video Graphics Array » video memory
Video Graphics Adaptor
Video Graphics Array
Nearby terms:
video display terminal « Video Electronics Standards
Association « Video Graphics Adapter « Video
Graphics Adaptor » Video Graphics Array » video
memory » Video on Demand
Video Graphics Array
<hardware> (VGA) A display standard for IBM PCs, with 640 x 480 pixels in
16 colours and a 4:3 aspect ratio. There is also a text mode with 720 x 400
pixels.
IBM technical references define the *product name* of their original VGA display
board as "Video Graphics Array", in contrast to the preceding boards, the "Color
Graphics Adapter" (CGA) and "Enhanced Graphics Adapter" (EGA).
See also Super Video Graphics Adapter.
(1995-01-12)
Nearby terms:
Video Electronics Standards Association « Video
Graphics Adapter « Video Graphics Adaptor « Video
Graphics Array
» video memory » Video on Demand » video RAM
video memory
<storage> The memory in a computer's graphics adaptor, used to store the
image displayed on a bitmap display. Often this is built using VRAM chips. There
is normally a simple correspondence between groups of bits in video memory and
the dots or "pixels" on the screen, such that writing to a given group of bits
will alter the appearance of a single dot. If each pixel corresponds to eight
bits then it can have any of 256 colours (or shades of grey on a monochrome
display).
The video display electronics is responsible for reading the data from video
memory and converting it into the necessary signals to drive the display. Often
this includes a colour palette which converts pixel values into RGB triplets.
(1996-11-01)
Nearby terms:
Video Graphics Adapter « Video Graphics Adaptor «
Video Graphics Array « video memory » Video
on Demand » video RAM » video random access memory
Video on Demand
<communications> (VoD) A planned system using video compression to supply
programs to viewers when requested, via ISDN or cable.
(1994-11-02)
Nearby terms:
Video Graphics Adaptor « Video Graphics Array «
video memory « Video on Demand » video RAM »
video random access memory » video terminal
video RAM
video random access memory
Nearby terms:
Video Graphics Array « video memory « Video on
Demand «
video RAM » video random access memory » video
terminal » videotex
video random access memory
<hardware> (VRAM) Fast memory designed for storing the image to be
displayed on a computer's monitor. VRAM may be built from special memory
integrated circuits designed to be accessed sequentially.
VRAM must be fast enough to supply data to the display electronics at the speed
at which the screen is scanned. Thus for example, for a resolution of 1280x1024
eight-bit pixels at a refresh rate of 70 Hz, the video memory would need to
supply 1280x1024x70 = 90 Mbyte/s or one byte every 11 ns. The VRAM may be dual
ported in order to allow the display electronics and the CPU to access it at the
same time.
In an IBM PC the VRAM is located on the display interface card and 0.5 - 2 MB is
typical.
A VRAM Song!
(2001-02-14)
Nearby terms:
video memory « Video on Demand « video RAM «
video random access memory » video terminal »
videotex » Vienna Definition Language
video terminal
visual display unit
Nearby terms:
Video on Demand « video RAM « video random access
memory «
video terminal » videotex » Vienna Definition
Language » Vienna Definition Method
videotex
An obsolete electronic service offering people the privilege of paying to read
the weather on their television screens instead of having somebody read it to
them for free while they brush their teeth. The idea bombed everywhere it wasn't
government-subsidised, because by the time videotex was practical the installed
base of personal computers could hook up to time-sharing services and do the
things for which videotex might have been worthwhile better and cheaper.
Videotex planners badly overestimated both the appeal of getting information
from a computer and the cost of local intelligence at the user's end. Like the
gorilla arm effect, this has been a cautionary tale to hackers ever since. See
also vannevar.
[Jargon File]
Nearby terms:
video RAM « video random access memory « video
terminal «
videotex » Vienna Definition Language » Vienna
Definition Method » Vienna Development Method
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