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Class A Television Station
The class A television service is a system for regulating some low-power television (LPTV) stations in the United States. Class A stations are denoted by the broadcast callsign suffix "-CA" (analog) or "-CD" (digital), although very many analog -CA stations have a digital companion channel that was assigned the -LD suffix used by regular (non-class-A) digital LPTV stations. The FCC created this category of service as a result of the Community Broadcasters Protection Act of 1999. Support for this ruling came largely from the Community Broadcasters Association, an industry group representing low-power TV station operators. Unlike traditional LPTV stations, class-A stations were given primary status during the transition to digital television (DTV), meaning that a full-service television station could not displace a class A LPTV station from its broadcast frequency ( TV channel), except in rare cases. In contrast, traditional LPTV stations often found their frequencies assigned to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Television Station
A television station is a set of equipment managed by a business, organisation or other entity such as an amateur television (ATV) operator, that transmits video content and audio content via radio waves directly from a transmitter on the earth's surface to any number of tuned Television sets, receivers simultaneously. Overview The ''Fernsehsender Paul Nipkow'' (''TV Station Paul Nipkow'') in Berlin, Germany, was the first regular television service in the world. It was on the air from 22 March 1935, until it was shut down in 1944. The station was named after Paul Gottlieb Nipkow, the inventor of the Nipkow disk. Most often the term "television station" refers to a station which broadcasts structured content to an audience or it refers to the organization that operates the station. A terrestrial television transmission can occur via analog television signals or, more recently, via digital television signals. Television stations are differentiated from cable television or other video ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concentration Of Media Ownership
In chemistry, concentration is the abundance of a constituent divided by the total volume of a mixture. Several types of mathematical description can be distinguished: '' mass concentration'', '' molar concentration'', '' number concentration'', and '' volume concentration''. The concentration can refer to any kind of chemical mixture, but most frequently refers to solutes and solvents in solutions. The molar (amount) concentration has variants, such as normal concentration and osmotic concentration. Dilution is reduction of concentration, e.g. by adding solvent to a solution. The verb to concentrate means to increase concentration, the opposite of dilute. Etymology ''Concentration-'', ''concentratio'', action or an act of coming together at a single place, bringing to a common center, was used in post-classical Latin in 1550 or earlier, similar terms attested in Italian (1589), Spanish (1589), English (1606), French (1632). Qualitative description Often in informal, no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Broadcast Station Classes
This is a list of broadcast station classes applicable in much of North America under international agreements between the United States, Canada and Mexico. Effective radiated power (ERP) and height above average terrain (HAAT) are listed unless otherwise noted. All radio and television stations within of the US-Canada or US-Mexico border must get approval by both the domestic and foreign agency. These agencies are Industry Canada/ Canadian Radio-television and Telecommunications Commission (CRTC) in Canada, the Federal Communications Commission (FCC) in the US, and the Federal Telecommunications Institute (IFT) in Mexico. AM Station class descriptions All domestic (United States) AM stations are classified as A, B, C, or D. * A (formerly I) — clear-channel stations — 10 kW to 50 kW, 24 hours. **Class A stations are only protected within a radius of the transmitter site. **The old Class I was divided into three: Class I-A, I-B and I-N. NARBA distingu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TV Network
A television broadcaster or television network is a telecommunications network for the distribution of television content, where a central operation provides programming to many television stations, pay television providers or, in the United States, multichannel video programming distributors. Until the mid-1980s, broadcast programming on television in most countries of the world was dominated by a small number of terrestrial networks. Many early television networks such as the BBC, CBC, PBS, PTV, NBC or ABC in the US and in Australia evolved from earlier radio networks. Overview In countries where most networks broadcast identical, centrally originated content to all of their stations, and where most individual television transmitters therefore operate only as large " repeater stations", the terms "television network", " television channel" (a numeric identifier or radio frequency) and "television station" have become mostly interchangeable in everyday language, with prof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Subchannel
In broadcasting, digital subchannels are a method of transmitting more than one independent program stream simultaneously from the same digital radio or television station on the same radio frequency channel. This is done by using data compression techniques to reduce the size of each individual program stream, and multiplexing to combine them into a single signal. The practice is sometimes called " multicasting". ATSC television United States The ATSC digital television standard used in the United States supports multiple program streams over-the-air, allowing television stations to transmit one or more subchannels over a single digital signal. A virtual channel numbering scheme distinguishes broadcast subchannels by appending the television channel number with a period digit (".xx"). Simultaneously, the suffix indicates that a television station offers additional programming streams. By convention, the suffix position ".1" is normally used to refer to the station's main d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broadcast Translator
A broadcast relay station, also known as a satellite station, relay transmitter, broadcast translator (U.S.), re-broadcaster (Canada), repeater (two-way radio) or complementary station (Mexico), is a broadcast transmitter which repeats (or transponds) the signal of a radio or television station to an area not covered by the originating station. These expand the broadcast range of a television or radio station beyond the primary signal's original coverage or improves service in the original coverage area. The stations may be (but are not usually) used to create a single-frequency network. They may also be used by an AM or FM radio station to establish a presence on the other band. Relay stations are most commonly established and operated by the same organisations responsible for the originating stations they repeat. Depending on technical and regulatory restrictions, relays may also be set up by unrelated organisations. Types Translators In its simplest form, a broadcast transl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Statute
A statute is a law or formal written enactment of a legislature. Statutes typically declare, command or prohibit something. Statutes are distinguished from court law and unwritten law (also known as common law) in that they are the expressed will of a legislative body, whether that be on the behalf of a country, state or province, county, municipality, or so on. Depending on the legal system, a statute may also be referred to as an "act." Etymology The word appears in use in English as early as the 14th century. "Statute" and earlier English spellings were derived from the Old French words ''statut'', ''estatut'', ''estatu,'' meaning "(royal) promulgation, (legal) statute." These terms were in turn derived from the Late Latin ''statutum,'' meaning "a law, decree." Publication and organization In virtually all countries, newly enacted statutes are published and distributed so that everyone can look up the statutory law. This can be done in the form of a government gazette, whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simulcast
Simulcast (a portmanteau of "simultaneous broadcast") is the broadcasting of programs or events across more than one resolution, bitrate or medium, or more than one service on the same medium, at exactly the same time (that is, simultaneously). For example, Absolute Radio is simulcast on both AM and on satellite radio. Likewise, the BBC's Prom concerts were formerly simulcast on both BBC Radio 3 and BBC Television. Another application is the transmission of the original-language soundtrack of movies or TV series over local or Internet radio, with the television broadcast having been dubbed into a local language. Yet another is when a sports game, such as Super Bowl LVIII, is simulcast on multiple television networks at the same time. In the case of Super Bowl LVIII, the game's main broadcast channel was CBS, but viewers could watch it on other CBS-owned television channels or streaming services as well; Nickelodeon and Paramount+ showed the English-language broadcast, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DTV Transition In The United States
The digital television transition in the United States was the switchover from analog to exclusively digital broadcasting of terrestrial television programming. It was originally set for December 31, 2006, but was delayed several times due to multiple government acts being enforced on broadcasting companies. Full-power analog broadcasting ceased in most of the country on June 12, 2009, however various aspects of analog television were continued up until 2022. History The initial plans for the transition in 2006 were stipulated by the Telecommunications Act of 1996. However, this was put off by the Digital Transition and Public Safety Act of 2005, under which full-power broadcasting of analog television in the United States was set to have ceased after February 17, 2009. This was further delayed to June 12, 2009, after the passage of the DTV Delay Act on February 4, 2009. The delay to June 12 was to assist households on a waiting list for coupons for digital converter bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Television Transition
The digital television transition, also called the digital switchover (DSO), the analogue switch/sign-off (ASO), the digital migration, or the analogue shutdown, is the process in which older analogue television broadcasting technology is converted to and replaced by digital television. Conducted by individual nations on different schedules, this primarily involves the conversion of analogue terrestrial television broadcasting infrastructure to Digital terrestrial television (DTT), a major benefit being extra frequencies on the radio spectrum and lower broadcasting costs, as well as improved viewing qualities for consumers. The transition may also involve analogue cable conversion to digital cable or Internet Protocol television, as well as analog to digital satellite television. Transition of land based broadcasting had begun in some countries around 2000. By contrast, transition of satellite television systems was well underway or completed in many countries by this time. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Duopoly (broadcasting)
A duopoly (or twinstick, referring to "stick" as jargon for a radio tower) is a situation in television and radio broadcasting in which two or more stations in the same city or community share common ownership. United States In the United States, the practice of duopolies has been frowned upon when using public airwaves, on the premise that it gives too much influence to one company. However, rules governing radio stations are less restrictive than those for television, allowing as many as eight radio stations under common ownership in the largest U.S. media markets. Ownership of television stations with overlapping coverage areas was normally not allowed in the United States prior to 2002, even those that were not duopolies under the present legal definition, by way of being located in separate albeit adjacent markets; this required broadcasters to apply for cross-ownership waivers in some cases to retain full-power stations based in adjacent markets. Non-commercial educational ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twinstick
A duopoly (or twinstick, referring to "stick" as jargon for a radio tower) is a situation in television and radio broadcasting in which two or more stations in the same city or community share common ownership. United States In the United States, the practice of duopolies has been frowned upon when using public airwaves, on the premise that it gives too much influence to one company. However, rules governing radio stations are less restrictive than those for television, allowing as many as eight radio stations under common ownership in the largest U.S. media markets. Ownership of television stations with overlapping coverage areas was normally not allowed in the United States prior to 2002, even those that were not duopolies under the present legal definition, by way of being located in separate albeit adjacent markets; this required broadcasters to apply for cross-ownership waivers in some cases to retain full-power stations based in adjacent markets. Non-commercial educational b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
