| cd-rom drive | - A computer peripheral that plays cd-roms.
- An electromechancial device that reads data on cd-roms. most cd-rom drives have a scsi interface, although some are connected to a pc via a...
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| cd-rom xa | Cd-rom extended architecture a compact disc standard that permits the interleaving of compressed audio and video tracks for sound and animation synchronization. based on the yellow book, it also u... |
| cd-wo - compact disc-write once | A term that describes compact discs that can be written to directly (rather than mass produced) with a laser recorder. recent developments allow the cd-wo to be appendable. cd-wo media is physical... |
| center clipper | Variable attenuator which is used to eliminate any residual echo left by the echo canceller. a key difference between one canceller and another is the manner in which this center clipper operates.... |
| central processing unit - cpu | The unit of a computer that includes circuits controlling the interpretation and execution of instructions. |
| cfda - catalog of federal domestic assistance | The cfda is a government-wide compilation of federal programs, projects, services and activities that provide assistance or benefits to the american public. the primary purpose of the cfda is to a... |
| cfr - code of federal regulations | The cfr is the book of federal laws and regulations. usually referenced like this, 34 cfr 74.137. the 34 indicates that the subject of the regulation is education. the 70.137 refers to a specific ... |
| character generator | - An alphanumeric text generator, a typewriter like device, commonly used to display messages on a television set. chyron is a brand name for a character generator which is often mistakenly used...
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| charge-coupled device - ccd | A solid-state device used in many television cameras to convert optical images into electronic signals. these imagers are organized into rows and columns called pixels. the charge pattern formed i... |
| chip sets | Application-specific integrated circuits (asics) are being developed for use in video application products such as codecs, desktop video, and home satellite entertainment. asics operate more like ... |
| chroma key | In color television, an electronic matting process of inserting one image over a background. used very commonly with weathercasters who are standing in front of a blank wall painted process blue. ... llave croma; |
| circular polarization | A mode of transmission in which signals are downlinked in a rotating corkscrew pattern. a satellite`s transmission-capacity can be doubled by using both right-hand and left-hand circular polarizat... |
| class iv | A signaling path provided by a cable television system to transfer signals of any type from a subscriber terminal to another point in the cable television system. |
| closed circuit television - cctv | A private television system in which signals are sent usually via cable, to selected viewing points throughout the distribution system but are not broadcast to the public. the signal does not have... |
| clv - constant linear velocity | A disc that rotates at a varying rate of speed. examples are cd-audio, cd-rom, cd-i, cd-rom xa, and some videodiscs. clv videodiscs may contain up to one hour of full motion video, but still frame... |
| coaxial cable - coax | A type of metal cable used for broadband data and cable systems. it has excellent broadband frequency characteristics, noise immunity and glossary/18 physical durability. consisting of a center co... |
| collaborative learning | Collaborative learning involves a group working together through technology to delve into content. students can electronically access other students, the instructor and resources. |
| color bars and tone | A color standard test pattern used by the television industry to adjust equipment to standard levels. the tone is generated at a certain preset frequency so that audio levels can be set. |
| color signal | Any signal at any point in a color television system for wholly or partially controlling the chromaticity values of a color television picture. сигнал цветности;; цветовой сигнал (в телевидении); |
| color subcarrier | In ntsc color, the 3.58 mhz subcarrier whose modulation sidebands are interleaved with the video luminance signal to convey color information. |
| combining network | A passive network which permits the combining of several signals into one output with a high degree of isolation between individual inputs; commonly used in catv headends to combine the outputs of... |
| command line | - On unix host systems, this is where you tell the machine what you want it to do, by entering commands.
- Командная строка; строка команды command line argumentаргумент командной строк...
командная строка; |
| communications satellite corporation - comsat | A common carrier service that provides commercial communications services. glossary/19 |
| communications software | A program that tells a modem how to work. |
| compressed video | - Processes video images; transmits changes fro one frame to the next which reduces the bandwidth to send them over a telecommunications channel; reduces cost. also called bandwidth compression,...
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| compuserve - compuserve information service - cis | One of the oldest and largest commercial computer network services. |
| computer conferencing | - Allows individuals at different locations to communicate with each other through computers. this could be through a chat room, e-mail, a classroom environment created by software. it might inc...
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| computer-aided design - cad | A computer system whereby engineers create a design and see the proposed product in front of them on a graphics screen or in the form of a computer printout. |
| conferencing | - A term used to indicate when several network users communicate on a particular subject. conferences can be live or conducted via a bbs (see above).
- Организация и проведение научно-т...
проведение конференций;; средства проведения телеконференций; конференц-связь;; |
| connect time | - Time period during which a user is utilizing a computer on-line - or directly connected with the computer. glossary/20
- Время сеанса
- The amount of time during which a user...
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| connect time charges | Most networks charge users for the time they spend on-line. these are referred to as connect time charges. the amount charged depends on the network`s fee schedule. users must also pay a separate ... |
| continuous presence video | Simultaneous and continuous pictures of participants. |
| convergence - digital fusion | The merging of video, audio, and data communications through digitization of the media. the equipment to receive the signals is projected to be a telecomputer. |
| courseware | Software used in teaching. often used to describe computer programs designed for the classroom. |
| credits | The names of people on whom the production can be blamed. electronically generated words that usually move horizontally up the screen like a scroll, or inserted a page at a time. créditos; авторы; |
| cren | Corporation for research and educational networking. corporation for research and educational networking; |
| cyberphobic | A person who is fearful of working in cyperspace. |
| cyberspace | - Coined by science fiction writer william gibson in the 1970s, it describes the virtual place of computer memory, networks, and multimedia. glossary/22 d d1 and d2 digital tape component and co...
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| daemon | - An otherwise harmless unix program that normally works out of sight of the user. on the internet, you`ll most likely encounter it only when your e-mail is not delivered to your recipient - you...
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| data communications | - 1. the movement of encoded information by means of electrical or electronic transmission systems. 2. the transmission of data from one point to another over communications channels.
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| dbs - direct broadcast satellite | Service uses high powered satellites to broadcast multiple channels of tv programming to inexpensive, small-dish antennas at homes for direct on-site reception of signals. |
| dct - discrete cosine transform | Compression algorithm. |
| dedicated lines | Leased telecommunications circuits that are devoted to a specific application; a circuit designated for exclusive use by two users; i.e., for interactive portion of a teleconference. |
| dedicated system | - Videoconferencing equipment, transmission circuits, and teleconferencing facilities that are permanent and used on a regularly scheduled basis as opposed to rented for a one-time or ad hoc eve...
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| degausser | 1. demagnetizer. 2. a device for bulk erasing magnetic tape. |
| demodulate | To retrieve an information carrying signal from a modulated carrier. a demodulator is a device that removes the modulation from a carrier signal. demodular; |
| dial up - dialup | To call another computer via modem. a connection or line reached by modem, as in a dialup line. |
| dial-up teleconferencing | Using public phone line to connect with a teleconference, either with or without operator assistance. |
| digirati | Literati who do everything digitally. |
| digital media | - Refers to any type of information in digital form including computergenerated text, graphics and animations, as well as photographs, animation, sound, and video.
- Цифровое мультимеди...
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| digital video effects - dve | Video effects accomplished through digital devices that manipulate the video; e.g., page turns, revolves, boxes that zoom into and out of the picture, images that turn into pixels, etc. |
| digitized audio | Allows the incorporation of audio materials with other media to present information over a computer network or through the internet. with this method, glossary/24 the audio is contained.various so... |
| digitizer | - A device that converts an analog signal (either images or sound) into a digital signal that can be manipulated on the computer. video capture boards convert video images from video sources suc...
цифровой преобразователь; цифрователь; цифровой преобразователь; цифратор;; цифровой датчик;; устройство ввода аналоговой информации;; устройство ввода графической информации; графический планшет; дигитайзер; преобразователь; |
| direct read after write - draw | A laser based technology for recording data on a videodisk. |
| directional microphone | - A microphone that detects and transmits sound from only a certain direction. useful in preventing unwanted sound from being transmitted.
- Направленный микрофон
- A microphon...
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| disk - disc | A record-like magnetic-coated piece of material that can store digital information; may be a hard disk or pliable floppy disk. |
| disk drive | - A computer data storage device in which data is stored on the magnetic coating (similar to that on magnetic tape) of a rotating disk.
- Дисковый накопитель; дисковод; диск; дисковое з...
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| distance learning | - Educational situations which use telecommunications devices to deliver content, exchange information, allow student interaction, and other educational activities. technologies might include on...
дистанционное обучение; |
| distributed function | - The use of programmable terminals, controllers, and other devices to perform operations that were previously done by the processing unit, such as managing data links, controlling devices, and ...
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| distribution systems | Any program that can be received by the satellite antenna, can be distributed into several viewing areas. the distribution system is one or more wires that run from the earth station control room,... |
| dot file | - A file on a unix public-access system that alters the way the user or the messages interact with that system. for example, a user`s .login file contains various parameters for such things as t...
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| double speed drive | Refers to a cd-rom drive that will read certain kinds of data faster than the standard requires (155kb/sec). many drives now have 300kb/sec transfer rates (also known as twice the standard, or 2x)... |
| double-talk | The situation where parties at both ends of a conference are speaking simultaneously. a quality echo canceller will provide a continuous speech path in both directions during double-talk. |
| downconverter | A device used to lower the frequency of any signal. |
| drive bay | - The opening in a computer chassis designed to hold a floppy drive, hard drive, cd-rom drive, tape drive or other device. may be half-height or full-height, exposed or internal.
- Секц...
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| drop-outs | Black or white lines or spots appearing in a television picture originating from the playback of a video tape recording. ds1 digital signal level 1; a digital transmission format in which 24 voice... |
| dtmf - dual tone multiple frequencies | Standard telephone signaling technique which can be used through any transmission medium of voice grade or better. he technique is often used for remote switching control functions. |
| dual band capability | Many receivers are capable of both c and kuband operation. |
| dub - dupe - duplicate | The duplication of an electronic recording. dubs can be made from tape to tape in video, or from record to tape in audio. in video, one generation of quality is usually lost between each duplicate... |
| dvi - digital video interactive | Dvi is a programmable (variable bit and frame rate) compression and decompression technology developed by intel offering two distinct levels and qualities of compression and decompression for moti... |
| earth station | - The location antenna used to send or receive signals to satellites normally located in the geostationary orbit. a parabolic antenna and associated electronics for receiving or transmitting sat...
estación terrestre; |
| echo reduction | A newer method of echo control, developed in 1988, uses attenuation in a new way to subjectively reduce the returned echo without the mutilation (choppiness, level drops, distortion) found in supp... |
| educational access channel | A cable television channel specifically designated for use by local education authorities. |
| edutainment | - Multimedia designed for teaching. it`s based on the theory that learning doesn`t have to be boring.
- A content descriptor developed by the entertainment software rating board (esrb)....
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| efm | Eight to fourteen modulation. преобразование 8-в-14; efm-модуляция;; ethernet в первой миле; ethernet in first mile;; eight-to-fourteen modulation; |
| e-layer | A heavily ionized signal-reflecting region location 50-70 miles above the surface of the earth, within the ionosphere. |
| electrically alterable read only memory - earom | A type of memory that is nonvolatile, like rom, but can be altered, or have data written into it, like ram. |
