- 行业: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
- Company Profile:
ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
1. In video and television technology, a device that allows the reformatting of a digital data stream originating from one sampling structure (lines per frame, pixels per line) into a digital data stream of another sampling structure for the purposes of recording or passing the original data stream through distribution devices designed to accommodate the latter structure. Note: Since, in format conversion, the data still represent the original sampling structure, this process is not the same as standards conversion (from PAL to NTSC, for instance. ) A format converter can, for instance, accept a signal introduced in a proposed format, and convert it for recording on, and subsequent reproduction from, a high-definition television digital recorder designed for the 1125/60/2:1 format. 2. In television technology, a system that converts display information from the familiar 3 x 4 aspect ratio to the newer 9 x 16 aspect ratio.
Industry:Telecommunications
1. In video and multimedia, bit-rate reduction of an image signal by powerful algorithms that compress beyond what is achievable in lossless compression or in quasi-lossless compression. Note: Lossy compression accepts loss of information and introduction of artifacts that can be ignored as unimportant when viewed in direct comparison with the original. Lossy compression takes advantage of the subtended viewing angle for the intended display, the perceptual characteristics of human vision, the statistics of image populations, and the objectives of the display. 2. In video technology, a digital image compression technique that removes redundant bits from an image in return for a minor loss of image quality.
Industry:Telecommunications
1. In the storage of digital data, reduction, by the use of one or more appropriate algorithms, of the amount of data to be stored, in such a manner that the original data may be recovered precisely; i.e., in the exact original form. Note: The actual algorithm (s) applied to a given set of data may depend on the application (and hence, the statistical properties) of the data, e. G. , for image storage. 2. An analogous real-time process applied to the transmission of digital data, with the objective of reducing the amount of data that need be transmitted per unit time; i.e., data rate, without compromising the ability to completely restore the data. 3. A digital image compression technique that allows for the removal of redundant bits without a resulting loss of image quality.
Industry:Telecommunications
1. In the radio regime, of an antenna pattern, the angle between the half-power (3-dB) points of the main lobe, when referenced to the peak effective radiated power of the main lobe. Note: Beamwidth is usually expressed in degrees. It is usually expressed for the horizontal plane, but may also be expressed for the vertical plane. 2. For the optical regime, see beam divergence.
Industry:Telecommunications
1. In the Open Systems Interconnection--Reference Model (OSI--RM,) a capability of a given layer, and the layers below it, that (a) is provided to the entities of the next higher layer and (b) for a given layer, is provided at the interface between the given layer and the next higher layer. 2. This term is used as a generic reference to distributed applications that provide "services" to other applications. 3. The association for a particular time of a user identification, a subject and a security clearance. ***PROPOSED ADDITION*** In Service Oriented Networks, the two basic uses of service are: a) Something of value being provided to and consumed by end-users of communications networks. It may be a specific service, such as Verizon FIOS IPTV Premier or Acme Restaurant Finder, or it may be general, such as VoIP telephony service or emergency services. B) A function that is performed by software whose output is used by some other entity. It may be, for example, a presence engine, or a routing function, or a number translation capability, or protocol interworking. ‘Service' may also refer to the software itself. A service can be turned into a Service Enabler when complemented with appropriate logic and exposure building blocks, so that it can be reused or combined by another application through well-defined functional and operational interfaces. This definition is being proposed for addition/change in the ATIS Telecom Glossary by the PRQC. If you have any objections to this acronym being added to the Telecom Glossary, please contact Paul Savitz, PRQC Committee Administrator, via email at psavitz@atis. Org to note your objection. ***
Industry:Telecommunications
1. In the Internet, an intelligent search tool that automatically seeks out relevant online information based on the user's specifications. Synonyms agent, bot, crawler, hotbot, infobot, information agent, intelligent agent, Internet search engine, knowbot, knowledge robot, personal agent, robotic librarian, search robot, spider, Web crawler, Web spider, wizard. 2. In artificial intelligence, an entity with the ability to sense its environment and to act in such a way or to affect that environment; typically knowledge-based entities that can communicate with each other through some message-passing scheme.
Industry:Telecommunications
1. In network topology, a terminal of any branch of a network or an interconnection common to two or more branches of a network. Synonyms junction point, nodal point. 2. In a switched network, one of the switches forming the network backbone. Note: A node may also include patching and control facilities. 3. A technical control facility (TCF. ) 4. A point in a standing or stationary wave at which the amplitude is a minimum. In this sense, synonym null. 5. A data processing facility that provides information processing resources as part of a network. A node may support user application processes, server application processes or a combination of both kinds of processes.
Industry:Telecommunications
1. In television technology, the signal that describes (a) the distribution of brightness levels within the image and (b) the equation for deriving that information from the camera output. 2. In composite color television, a signal that has major control of the brightness. Note: Luminance signal is a linear combination of gamma-corrected primary color signals.
Industry:Telecommunications
1. In television technology, the process of converting image information from one format (standard) to another. Note: The conversion may, for example, affect (involve) the frame rate, the number of lines per frame, the analog resolution per scanning line, or (in digital systems) the number of pixels per scanning line. 2. In video post-production, the process of changing the image size (e.g., by cropping, zooming, or distorting the image geometrically. ) Note: The altered video signal is sampled and the samples are then processed by a suitable algorithm and a new set of samples is generated that is compatible with the specifications of the target system.
Industry:Telecommunications
1. In television and video technology, a process in which color signals are used to modify each other for the purpose of altering their color rendition. Note: The process is often accomplished by suitable cross coupling between primary color-signal channels. 2. One way of partial compensation for photo-receptor cot sensitivity, nonoptimum color filters, nonideal display phosphors, unwanted dye absorption, etc.
Industry:Telecommunications
