Glossary - V
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Very High Frequency (VHF) - Channels 2-13 (54-88 MHz and 174-216 MHz)
Video - A term pertaining to the bandwidth and spectrum of the signal which results from television scanning and which is used to produce a picture.
Video Band - The frequency band utilized to transmit a composite video signal.
Video-on-Demand (VOD) - Allows the end-user subscriber to select at any time movies they wish to view from a large selection of titles and categories stored on a remote server. Service may also provide VCR functionality, (stop, pause, etc.) which allows the end-user subscriber to control the "play back" of the server from the remote control.
Video Transmission - The original video signal before it is modulated and converted to radio-frequency and broadcast or cablecast. A home television set reconverts radio-frequencies to a video signal.
Videotape - Used to electronically record sight and sound for instant playback. Videotape comes in half-inch, three-quarters, one and two-inch widths and can be erased and re-recorded.
Videotape Recorder (VTR) - A device which allows the recording and playback of magnetic tape sound and picture recordings.
Videotex - The generic term used to refer to a 2-way interactive system for the delivery of computer-generated data into the home, usually using the television set as a display device. Some of the more often used specific terms are "viewdata" for telephone-based systems (narrowband interactive systems); "wideband broadcast" or "cabletext" for systems utilizing a full video channel for information transmission; and "wideband 2-way teletext" for systems which could be implemented over 2-way cable television systems. In addition, hybrids and other transmission technologies, such as satellite, could be used for delivery of videotex services on a national scale.
Viewers Per Viewing Household (VPVH) - A demographic percentage which indicates how many persons per 100 or per 1,000 households are viewing. For example, a VPVH of 80 K2-11 means that for every 100 households viewing, there are an estimated 80 children ages 2 to 11.
Violence Chip (V-Chip) - A term used to describe a microchip which will permit parental control over rated television programs.
Virtual Channel (VC) - The communication channel that provides for the sequential unidirectional transport of ATM cells.
Virtual circuit - This term refers to a predefined path through a network that provides a connection-oriented session between two applications.
Virtual Private Network (VPN) - A term that is applied to either voice or data networking. In essence, a VPN is a portion of a public network that has been logically partitioned for private use.
Voice-over-Internet Protocol (VoIP services) - These services are a provision of voice telephony via the use of packet-switched networks running Internet Protocol (IP) networks rather than traditional circuit switching.
Voice-Over-Net (VON) - A term that refers to various sets of technologies that are used to enable voice applications across the Internet.
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