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Sign-on
A sign-on (or start-up in Commonwealth countries except Canada) is the beginning of operations for a radio or television station, generally at the start of each day. It is the opposite of a sign-off (or closedown in Commonwealth countries except Canada), which is the sequence of operations involved when a radio or television station shuts down its transmitters and goes off the air for a predetermined period; generally, this occurs during the overnight hours although a broadcaster's digital specialty or sub-channels may sign-on and sign-off at significantly different times as its main channels. Like other television programming, sign-on and sign-off sequences can be initiated by a broadcast automation system, and automatic transmission systems can turn the carrier signal and transmitter on/off by remote control. Sign-on and sign-off sequences have become less common due to the increasing prevalence of 24-hour-a-day, seven-day-a-week broadcasting. However, some national broad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
City Of License
In American, Canadian, and Mexican broadcasting, a city of license or community of license is the community that a radio station or television station is officially licensed to serve by that country's broadcast regulator. In North American broadcast law, the concept of ''community of license'' dates to the early days of AM radio broadcasting. The requirement that a broadcasting station operate a ''main studio'' within a prescribed distance of the community which the station is licensed to serve appears in U.S. law as early as 1939. Various specific obligations have been applied to broadcasters by governments to fulfill public policy objectives of broadcast localism, both in radio and later also in television, based on the legislative presumption that a broadcaster fills a similar role to that held by community newspaper publishers. United States In the United States, the Communications Act of 1934 requires that "the Commission shall make such distribution of licenses, f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Call Sign
In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique identifier for a transmitter station. A call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a station's identity. The use of call signs as unique identifiers dates to the landline railroad telegraph system. Because there was only one telegraph line linking all railroad stations, there needed to be a way to address each one when sending a telegram. In order to save time, two-letter identifiers were adopted for this purpose. This pattern continued in radiotelegraph operation; radio companies initially assigned two-letter identifiers to coastal stations and stations onboard ships at sea. These were not globally unique, so a one-letter company identifier (for instance, 'M' and two letters as a Marconi sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Test Card
A test card, also known as a test pattern or start-up/closedown test, is a television test signal, typically broadcast at times when the transmitter is active but no program is being broadcast (often at sign-on and sign-off). Used since the earliest TV broadcasts, test cards were originally physical cards at which a television camera was pointed, allowing for simple adjustments of picture quality. Such cards are still often used for calibration, alignment, and matching of cameras and camcorders. From the 1950s, test card images were built into monoscope tubes which freed up the use of TV cameras which would otherwise have to be rotated to continuously broadcast physical test cards during downtime hours. Electronically generated test patterns, used for calibrating or troubleshooting the downstream signal path, were introduced in the late-1960s. These are generated by test signal generators, which do not depend on the correct configuration (and presence) of a camera, and can als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Station Identification
Station identification (ident, network ID or channel ID or bumper) is the practice of radio and television stations and networks identifying themselves on-air, typically by means of a call sign or brand name (sometimes known, particularly in the United States, as a "sounder" or "stinger", more generally as a station or network ID). This may be to satisfy requirements of licensing authorities, a form of branding, or a combination of both. As such, it is closely related to production logos, used in television and cinema alike. Station identification used to be done regularly by an announcer at the halfway point during the presentation of a television program, or in between programs. Asia Idents are known as a ''montage'' in Thailand and the Malay world (except Indonesia), and as an ''interlude'' in Cambodia and Vietnam. Philippines Station identifications in the Philippines differ from the vernacular meaning in most of the world. They describe what would be referred to as imag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Broadcaster
Public broadcasting involves radio, television and other electronic media outlets whose primary mission is public service. Public broadcasters receive funding from diverse sources including license fees, individual contributions, public financing and commercial financing. Public broadcasting may be nationally or locally operated, depending on the country and the station. In some countries a single organization runs public broadcasting. Other countries have multiple public-broadcasting organizations operating regionally or in different languages. Historically, public broadcasting was once the dominant or only form of broadcasting in many countries (with the notable exceptions of the United States, Mexico and Brazil). Commercial broadcasting now also exists in most of these countries; the number of countries with only public broadcasting declined substantially during the latter part of the 20th century. Definition The primary mission of public broadcasting is that of public service ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ČT Art
ČT art is a Czech national television channel, operated by Česká televize specialising in cultural content. The channel began broadcasting on 31 August 2013, with Tomáš Motl as its first executive director. ČT art broadcasts from 8 pm to 6 am, and shares its frequency with children's channel ČT Déčko which uses the remaining hours. Programming Each day begins with the news programme ''Události v kultuře'' (News in culture), and on Sundays ''Týden v kultuře'' (Week in culture), these are supplemented by inputs from live events and current affairs talk shows with cultural themes. Across the week, each day is given a theme for programming: *Monday - ''Z první řady'' (The first row), student work, work from Slovenská televízia Slovenská televízia (; "Slovak Television"; STV) was a state-owned public television organisation in Slovakia. It was created in 1991 as the Slovak part of the former Czechoslovak Television and was headquartered in Bratislava ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transmitter Power Output
In radio transmission, transmitter power output (TPO) is the actual amount of power (in watts) of radio frequency (RF) energy that a transmitter produces at its output. This is not the amount of power that a radio station reports as its power, as in "we're 100,000 watts of rock 'n' roll", which is usually the effective radiated power (ERP). The ERP for VHF-/UHF-transmitters is normally more than the TPO, for LF-/MF-transmitters it has nearly the same value, while for VLF-transmitters it may be less. Signal formula The radio antenna's design "focuses" the signal toward the horizon, creating gain and increasing the ERP. There is also some loss (negative gain) from the feedline, which reduces some of the TPO to the antenna by both resistance and by radiating a small part of the signal. The basic equation relating transmitter to effective power is: ::TPO\ \times\ loss_\ \times\ gain_\ =\ ERP Note that in this formula the Antenna Gain is expressed with reference to a tuned dipole ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interval Signal
An interval signal, or tuning signal, is a characteristic sound or musical phrase used in international broadcasting, numbers stations, and by some domestic broadcasters, played before commencement or during breaks in transmission, but most commonly between programmes in different languages. It serves several purposes: * It helps a listener using a radio with an analog tuner to find the correct frequency. * It informs other stations that the frequency is in use. * It serves as a station identifier even if the language used in the subsequent broadcast is not one the listener understands. The practise began in Europe in the 1920s and 1930s and was carried over into shortwave broadcasts. The use of interval signals has declined with the advent of digital tuning systems, but has not vanished. Interval signals were not required on commercial channels in the United States, where jingles were used as identification. List of interval signals by station * Radiodifusión Argentin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shortwave Radio
Shortwave radio is radio transmission using shortwave (SW) radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 metres); above the medium frequency band (MF), to the bottom of the VHF band. Radio waves in the shortwave band can be reflected or refracted from a layer of electrically charged atoms in the atmosphere called the ionosphere. Therefore, short waves directed at an angle into the sky can be reflected back to Earth at great distances, beyond the horizon. This is called skywave or "skip" propagation. Thus shortwave radio can be used for communication over very long distances, in contrast to radio waves of higher frequency, which travel in straight lines ( line-of-sight propagation) and are limited by the visual horizon, about 64 km (40 miles). Shortwave broadcasts of radio programs played an important role in the early days of rad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dual-tone Multi-frequency Signaling
Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963. DTMF is standardized as ITU-T Recommendation Q.23. It is also known in the UK as ''MF4''. The Touch-Tone system using a telephone keypad gradually replaced the use of rotary dial and has become the industry standard for landline and mobile service. Other multi-frequency systems are used for internal signaling within the telephone network. Multifrequency signaling Before the development of DTMF, telephone numbers were dialed by users with a loop-disconnect (LD) signaling, more commonly known as pulse dialing (dial pulse, DP) in the United States. It functions by i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ITV Nightscreen
''ITV Nightscreen'' was a scheduled programme on the ITV television network, consisting of a sequence of animated pages of information about ITV's upcoming programmes, features and special events, with easy listening music in the background. The programme was used to fill the station's overnight downtime, where a closedown would have once been used at the end of programmes. The programme was generally shown 7 days a week with the typical weekday show airing from 4:05am – 5:05am daily. However, on ITV's digital channels, the amount of Teleshopping affects how much ''Nightscreen'' is broadcast. The programme was also broadcast on all of ITV's +1 channels. At Christmas and weekends, an additional 55 minutes was broadcast from 5:05am – 6am as no other programmes were shown. Very occasionally was is not broadcast due to live events and other programming filling its hour. It was first broadcast on 14 January 1998, and consisted of teletext pages taken from the ITV regional tele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
