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Encyclopedia > Virtual channel

In Telecommunication is the extension of communication over a distance. In practice it also recognizes that something may be lost in the process; hence the term telecommunication covers all forms of distance and/or conversion of the original communications, including radio, telegraphy, television, telephony, data communication and computer networking. The elements... telecommunications, a virtual channel is a For the geographical meanings of this word, see channel (geography). In communications, a channel is the path or route which a message follows, as it is transmitted between a communication source and a receiver. More specifically, in telecommunications, the term has the following definitions: A connection between initiating and terminating... channel designation which differs from the actual Radio transmission diagram and electromagnetic waves Radio is a technology that allows the transmission of signals by modulation of electromagnetic waves with frequencies below those of light. Radio waves Radio waves are a form of electromagnetic radiation, and are created whenever a charged object accelerates with a frequency that lies... radio channel or Sine waves of various frequencies; the lower waves have higher frequencies than those above. Frequency is the measurement of the number of times that a repeated event occurs per unit time. To calculate the frequency, one fixes a time interval, counts the number of occurrences of the event within that... frequency which the A signal may refer to: an abstract element of information, or, more exactly, usually a flow of information (in either one or several dimensions). See Signal (information theory). (in electronics) a signal is any physical phenomenon that can be modeled as a function from time or position. Signals carry information... signal travels.

This is most often applied to See TV (disambiguation) for other uses and Television (band) for the rock band Family watching television in the 1950s. Television is a telecommunication system for broadcasting and receiving moving pictures and sound over a distance. The term has come to refer to all the aspects of television programming and transmission... television, where Digital television (DTV) uses digital modulation and compression to broadcast video, audio and data signals to television sets. Introduction A major use of DTV can be to carry more channels on the same amount of bandwidth. Another can be high-definition programming. The digital signal eliminates common artifacts from analog... digital TV channels are Although rarely called by its name, IBAC is the method of placing digital TV stations on channels in the existing analog TV bands. While this can also be applied to all radio bands, no country has yet done so except for TV. See also IBOC. ... in-band adjacent-channel to analog ones. Channel 8 might use channel 32 for its The Advanced Television Systems Committee (ATSC) is the group that helped to develop the new digital television standard for the United States, also adopted by Canada, Mexico and South Korea and being considered by other countries. It is a competitor to the more widely-used DVB standards. The ATSC standard... ATSC or DVB, short for Digital Video Broadcasting, is a suite of internationally accepted, open standards for digital television maintained by the DVB Project, an industry consortium with more than 300 members, and published by a Joint Technical Committee (JTC) of European Telecommunications Standards Institute (ETSI), European Committee for Electrotechnical Standardization (CENELEC... DVB transmission, but a virtual channel map or virtual channel table (VCT) allows viewers to tune to channel 8 on a digital set anyhow. DTV A tuner is a device to adjust the resonant frequency of an antenna or transmission line to work most efficiently at one frequency or band of frequencies. A tuner is a radio receiver without an amplifier or loudspeaker, which is often constructed for superior audio quality in high fidelity applications... tuners typically scan all channels for this information while they are turned "off", and store it in memory for instant access later on.

Because DTV can carry multiple programs simultaneously, Virtual reality (abbreviated VR) describes an environment that is simulated by a computer. Most virtual reality environments are primarily visual experiences, displayed either on a computer screen or through special stereoscopic goggles, but some simulations include additional sensory information, such as sound through speakers. Users can often interactively manipulate a... virtual channels also map out subchannels. Typically, the main programme is on channel 8.1 (or 8-1), in the example for channel 8. Other programmes are on 8.2, 8.3, and so forth up to 99, with data channels from 100 to 999. In this case, 8 is the "major channel", and 1, 2, or 3 is the subchannel. There is no practical difference between a dot and a dash, though the dot looks familiar to The abbreviations FM, Fm, and fm may refer to: Electrical engineering Frequency modulation (FM) and its most common applications: FM radio, used primarily to broadcast music and speech at VHF frequencies FM synthesis, a sound-generation technique popularized by early digital synthesizers Science Femtometre (fm), an SI measure of length... FM listeners, and avoids confusion with a range (e.g. 2-4 is 2.4, not 2 to 4).

In the ATSC standard, the virtual channel map is part of the Program and System Information Protocol (PSIP). In 2005 is a common year starting on Saturday of the Gregorian calendar. Events January Iraqi police officers hold up their index fingers marked with purple indelible ink, a security measure to prevent double voting. Worldwide aid effort continues to develop in response to the 2004 Indian Ocean earthquake. January 3... 2005, the The Federal Communications Commission (FCC) is an independent United States government agency, created, directed, and empowered by Congressional statute. The FCC was established by the Communications Act of 1934 as the successor to the Federal Radio Commission and is charged with regulating all non-Federal Government use of the radio... US FCC has begun requiring that major channel numbers of all DTV stations be mapped with PSIP to the old numbers by February 1 is the 32nd day of the year in the Gregorian Calendar. There are 333 days remaining, (334 in leap years). Events 1662 - The Chinese pirate Koxinga seizes the island of Taiwan after a nine-month siege. 1713 - The Kalabalik or Tumult in Bendery results from the Ottoman sultan... February 1. Old analog channels will continue to be referred to as subchannel 0 (i.e. 8.0) when tuning, until they are no longer In communications and information processing, a transmitter (sometimes abbreviated XMTR) is an object (source) which sends information to an observer (receiver). Crystal Palace transmitter, London A transmitter is an electronic device which with the aid of an antenna propagates an electromagnetic signal such as radio, television, or other telecommunications. A... transmitting.

Virtual channels are also used on Direct broadcast satellite, or DBS, is a relatively recent development in the world of television distribution. Direct broadcast satellite can either refer to the communications satellites themselves that deliver DBS service or the actual satellite television service. DBS systems are commonly referred to as minidish systems. The first commercial DBS... direct broadcast satellites, such as The DISH Network is a direct broadcast satellite (DBS) service that broadcasts digital satellite television and audio to households in the United States. Owned by Echostar, DISH Network was launched in March, 1996 and is DirecTVs primary competitor in the United States. DISH Network originally used an 18-inch... DISH Network, DirecTV is a direct broadcast satellite (DBS) service that broadcasts digital satellite television and audio to households in the United States. DirecTV is owned by DirecTV Group, a subsidiary of News Corporations Fox Entertainment Group. History DirecTV was launched in 1994 by General Motors subsidiary Hughes Electronics. It was... DirecTV, and SES-Astra (Société Européenne des Satellites-Astra) is a Luxembourg-based corporation which owns and operates the Astra series of geostationary satellites, which transmit approximately 1100 analogue and digital television and radio channels via 176 transponders to 91 million households across Europe. Formed in 1985 as SES, it... Astra. Rather than a few dozen channels with a few subchannels each, these services map to a range of hundreds of individually-numbered channels. Cable television or Community Antenna Television (CATV) (and often shortened to cable) is a system of providing television, FM radio programming and other services to consumers via radio waves transmitted directly to people’s televisions through fixed coaxial cables as opposed to the over-the-air method used in... Cable TV also does this on Digital cable is a term for a type of cable digital television that delivers more channels than possible with analog cable by using digital video compression. Digital cable also enables two-way communication, enabling services such the ability to purchase pay-per-view programming without the use of a phone... digital cable, as does A satellite radio is a special radio that receives signals broadcast by satellite. This allows the listener to follow a single channel no matter where they are because the signals reach is not limited by station power and curvature of the Earth. United States In the United States, two... satellite radio.

Digital radio describes radio technologies which carry information as a digital signal. See also software radio for a discussion of radios which use digital signal processing. Examples of one-way digital radio: Digital television broadcasting: DVB 8VSB Digital audio broadcasting: Eureka 147 (branded as DAB) in-band on-channel (branded... Digital radio also uses channels and subchannels, but only for DAB is an abbreviation that can stand for several things: Digital Audio Broadcast Daytona Beach International Airport The Daba language of Cameroon Dave & Busters restaraunts in the United States the German Aikido Federation, or Deutschen Aikido-Bundes eV Deutscher Akademikerinnen Bund e.V., an academic womens organization... DAB. The In-band on-channel (IBOC) is a method of transmitting digital and analog radio broadcast signals simultaneously on the same frequency. By utilizing a subcarrier, digital information is piggybacked on a normal AM or FM analog signal, thus avoiding any complicated extra frequency assignments. However, by putting extra RF energy... IBOC systems ( The title given to this article is incorrect due to technical limitations. The correct title is iBiquity. iBiquity is a company formed by the merger of USA Digital Radio and Lucent Digital Radio, with the goal of creating an in-band on-channel digital radio system for the United States... iBiquity and Digital Radio Mondiale (DRM) is an international non-profit consortium committed to designing an open platform for digital radio broadcasting around the world, especially on shortwave. The main advantage of such digital broadcasting is that it yields sound quality comparable to FM, but over shortwave distances. As a digital medium... Digital Radio Mondiale) do not currently use any virtual channels, mainly because they are lucky to fit anything digital at all on an analog A carrier wave is a waveform (usually sinusoidal) that is modulated (modified) to represent the information to be transmitted. This carrier wave is usually of much higher frequency than the modulating signal (the signal which contains the information). The reason for this is that it is much easier to transmit... carrier. As IBOC progresses and Analog Bandwidth is the width, usually measured in hertz, of a frequency band f2 − f1. It can also be used to describe a signal, in which case the meaning is the width of the smallest frequency band within which the signal can fit. It is usually notated B, W... bandwidth improves due to new Technology ( Gr. τεχνολογια < τεχνη craftsmanship + λογος word, reckoning + the suffix ια) has more than one definition. One is the development and application of tools, machines, materials and processes that help to... technology and the discontinuation of Stereo or stereophony generally refers to dual-channel sound recording and sound reproduction – sound that contains data for more than one speaker simultaneously. Compact disc audio and some radio broadcasts are stereo. The purpose of stereo recording is to recreate a more natural listening experience where the spatial location... stereo A subcarrier is separate analog or digital signal carried on a main radio transmission, which carries extra information such as voice or data. More technically, an already-modulated signal, which is then modulated into another signal of higher frequency and bandwidth. This is a method of multiplexing. Stereo is a... subcarriers (and later analog althogether), virtual channels may take hold there as well.

  Results from FactBites:
Virtual channel - Wikipedia, the free encyclopedia (358 words)
In telecommunications, a logical channel number (LCN), also known as virtual channel in North America, is a channel designation which differs from the actual radio channel or frequency on which the signal travels.
Channel 8 might use channel 32 for its ATSC or DVB transmission, but a virtual channel map or virtual channel table (VCT) allows viewers to tune to channel 8 on a digital set anyhow.
Virtual channels are also used on direct broadcast satellites, such as Dish Network, DirecTV, and Astra.
Virtual Channel Memory - Wikipedia, the free encyclopedia (153 words)
Virtual Channel Memory, or VCM, is a memory architecture which was originally developed by NEC.
VCM creates a state in which the various system processes can be assigned their own virtual channel, thus increasing the overall system efficiency by avoiding the need to have processes share buffer space.
This is accoplished by creating different "blocks" of memory and then allowing each individual memory block to interface separately with the memory controller and have its own buffer space.
  More results at FactBites »



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