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Vaporware:
Software
or hardware that is promised or talked about but is not
yet completed--and may never be released.
Variable
bit rate reduction:
See: Compression.
Video
coder overload
(also buffer overload): Video coder overload is tested
using rapid scene cuts, at most only a few frames apart, to stress
digital compression systems by presenting them with a video signal that
contains little or no temporal redundancy (frame-to-frame correlation).
Video
for Windows: Microsoft's
system-level Windows software architecture that is similar to Apple
Computer's QuickTime.
Video-on-demand
(VOD): When video can be requested at any time and is
available at the discretion of the end-user, it is then video-on-demand.
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VRML:
Virtual reality modeling language. An ISO standard for 3-D multimedia
and shared virtual worlds on the Internet.
VSB:
Vestigial
side band. VSB is a digital frequency modulation technique used to send
data over a coaxial cable network. Used by Hybrid Networks for upstream
digital transmissions, VSB is faster than the more commonly used QPSK,
but it's also more susceptible to noise.
VSWR:
Voltage standing wave ratio. The ratio of the maximum value of a
standing wave to its minimum value and is related to the return loss by
the equation: RL = 20log [(VSWR + 1)/(VSWR-1)] Thus a VSWR of 1.5:1 corresponds
to a return loss of 20log(5) = 13.97dB.
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