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`Computer Desktop Encyclopedia, Ninth Edition
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`Copyright © 2001 by The McGraw—Hill Companies. All rights reserved. Printed in the
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`1234567890 DOC DOC 901987654321
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`(VOlurne piXEL) A three—dimensional pixel. A voxel represents a quantity of 3-D data just as a pixel represents
`voxel
`a point or cluster of points in 2-D data. It is used in scientific and medical applications that process 3-D images,
`
`(Voyetra Turtle Beach, Inc., Yonkers, NY, www.tbeach.com) A manufacturer of sound cards and music
`Voyetra
`software that is a result of a late—1996 merger of Voyetra Technologies and Turtle Beach Systems. Voyetra was founded
`in 1975 as Octave Electronics, a synthesizer and repair facility in southern New York state. It introduced the Voyetra
`synthesizer and later moved into software for MIDI sequencer and music-related applications. Voyetra utilities are
`bundled with numerous sound cards.
`Turtle Beach was foundedin 1985in York, PA, and became known for its award—-winning Multisound line of
`high-end sound cards. Its consumer brands are also popular and are named after beaches from around the world
`such as Malibu, Montego and Daytona.
`V
`’
`
`
`VPC (Virtual Processor Complex) An IBM mainframe multiprocessing that uses several computers under tight
`central control.
`
`
`VPN (Virtual Private Network) A private network that is configured within a public network. For years, common
`carriers have built VPNs that appear as private national or international networks to the customer, but physically share
`backbone trunks with other customers. VPNs enjoy the security of a private network Via access control and encryption,
`while taking advantage of the economies of scale and built—in management facilities of large public networks. VPNs have
`been built over X25, Switched 56, frame relay and ATM technologies. Today, there is tremendous interest in VPNs over
`the Internet, especially due to the constant threat of hacker attacks. The VPN adds that extra layer of security, and a huge
`growth in VPN use is expected. See PPTP, LZF, LZTP, IPseC, PVC, security and transparent LAN service.
`
`VP ratio
`.4».me
`
`(Virtual Processor ratio) The number of virtual processors that a physical processor is simulating.
`
`VPS
`
`(Vectors Per Second) The measurement of the speed of a vector or array processor.
`
`VR
`
`See virtual reality.
`
`VRAM See video RAM.
`
`(Vertical Redundancy Check) An error checking method that generates and tests a parity bit for each byte of
`VRC
`data that is moved or transmitted.
`
`
`(Virtual Reality Modeling Language) A 3—D graphics language used on the Web. After downloading a
`VRML
`VRML page, its contents can be viewed, rotated and manipulated. Simulated rooms can be ”walked into.” The VRML
`Viewer is launched from within the Web browser.
`
`The first VRML Viewer was WebSpace from SGI, whose Open Inventor graphics library was the basis for developing
`VRML. WebFX, WorldView and Fountain‘are other Windows Viewers, and Whurlwind and Voyager are Mac viewers.
`
`(1) (Virtual Storage) Same as virtual memory.
`VS
`(2) (Virtual Storage) A family of minicomputers from Wang introduced in 1977, which use virtual memory techniques.
`
`
`VSAM (Virtual Storage Access Method) An IBM access method for storing data, widely used in IBM mainframes.
`It uses the B+tree method for organizing data.
`
`
`(Very Small Aperture satellite Terminal) A small earth station for satellite transmission that handles up to 56 ‘
`VSAT
`Kbits/sec of digital transmission. VSATs that handle the T1 data rate (up to 1.544 Mbits/sec) are called ”TSATs.”
`
`(1) (VME Subsystem Bus) An auxiliary ”backdoor” protocol on the VME bus that allows high—speed transfer
`V53
`between devices. It was faster than the main bus before the 64-bit implementation arrived.
`(2) (Vestigial SideBand) A digital modulation method developed by Zenith for cable modems and terrestrial
`transmission for DTV. See 8—VSB.
`
`VSE
`
`See DOS/V513.
`
`
`fig?"
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`Computer Desktop Encyclopedia
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