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ExtraVision
ExtraVision was a short-lived teletext service created and operated by the American television network CBS in the early to mid-1980s. It was carried in the vertical blanking interval of the video from local affiliate stations of the CBS network. It featured CBS program information, news, sports, weather, even subtitling for CBS programming (much like page 888 in British/European teletext, and American closed captioning). ExtraVision could also have its pages customized by the local affiliate station carrying it, for such things as program schedules, local community announcements, and station promotions. ExtraVision was discontinued by CBS towards the end of the 1980s, due to the service using the NABTS protocol, which required a quite expensive decoder to receive the service. Also, most of the local CBS affiliates carrying the ExtraVision service did not bother to invest in the computer equipment required to customize pages to carry locally oriented information on the service. C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NBC Teletext
NBC Teletext was a teletext service provided by the NBC, based on the NABTS standard. Initial trials started in Los Angeles in 1981. Transmissions started as a regular service on May 16, 1983 after FCC approval, in parallel with CBS similar '' ExtraVision'' service. Initially, the NBC Teletext was composed of a 50-page magazine, with the index page listing the following topics: Newsfront, Weather, Sports, Money, People, Your Body, Living, Your Stars, On the Soaps, Fun & Games, Kid's Korner, Partners, Credits. Graphics were reasonably detailed, allowing a detailed rendition of weather maps or movie posters. Since teletext provides real-time updates, it was expected that the service would attract advertisers like airlines, stores or businesses interested in constantly updating their rates and schedules. As there were no available standalone consumer decoders on the market, it was hoped that by launching the system manufacturers would soon built teletext capability into all televisi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NABTS
NABTS, the North American Broadcast Teletext Specification, is a protocol used for encoding NAPLPS-encoded teletext pages, as well as other types of digital data, within the vertical blanking interval (VBI) of an analog video signal. It is standardized under standard EIA-516, and has a rate of 15.6 kbit/s per line of video (with error correction). It was adopted into the international standard CCIR 653 (now ITU-R BT.653) of 1986 as CCIR Teletext System C. History NABTS was originally developed as a protocol by the Canadian Department of Communications, with their industry partner Norpak, for the Telidon system. Similar systems had been developed by the BBC in Europe for their Ceefax system, and were later standardized as the World System Teletext (WST, aka CCIR Teletext System B), but differences in European and North American television standards and the greater flexibility of the Telidon standard led to the creation of a new delivery mechanism that was tuned for speed. NABTS w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teletext
A British Ceefax football index page from October 2009, showing the three-digit page numbers for a variety of football news stories Teletext, or broadcast teletext, is a standard for displaying text and rudimentary graphics on suitably equipped television sets. Teletext sends data in the broadcast signal, hidden in the invisible vertical blanking interval area at the top and bottom of the screen. The teletext decoder in the television buffers this information as a series of "pages", each given a number. The user can display chosen pages using their remote control. In broad terms, it can be considered as Videotex, a system for the delivery of information to a user in a computer-like format, typically displayed on a television or a dumb terminal, but that designation is usually reserved for systems that provide bi-directional communication, such as Prestel or Minitel. Teletext was created in the United Kingdom in the early 1970s by John Adams, Philips' lead designer for video di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WBTV
WBTV (channel 3) is a television station in Charlotte, North Carolina, United States, affiliated with CBS and owned by Gray Television. The station's studios are located off Morehead Street, just west of Uptown Charlotte, and its transmitter is located in north-central Gaston County. In addition, WBTV's studios continue to house the operations of its former sister radio stations currently owned by Urban One: WBT-AM/ FM and WLNK, as well as WFNZ, which was previously owned by CBS Radio prior to its acquisition by Beasley Broadcast Group in 2014, followed by Entercom (now known as Audacy) in late 2017 and then Urban One in 2020 under a local marketing agreement. History The station first signed on the air on July 15, 1949. When it debuted, WBTV was the 13th television station in the United States and the first in the Carolinas; it is the oldest television station located between Richmond and Atlanta. Veteran Charlotte broadcaster Jim Patterson was the first person seen on the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Television Network
A television network or television broadcaster is a telecommunications network for distribution of television program content, where a central operation provides programming to many television stations or multichannel video programming distributor, pay television providers. Until the mid-1980s, television broadcast programming, programming in most countries of the world was dominated by a small number of terrestrial networks. Many early television networks (such as NBC, the Australian Broadcasting Corporation, ABC, or the BBC) 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 "broadcast relay station, repeater stations", the terms "television network", "television channel" (a numeric identifier or radio frequency) and "television station" have become mostly interchangeable in everyday language, wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertical Blanking Interval
In a raster scan display, the vertical blanking interval (VBI), also known as the vertical interval or VBLANK, is the time between the end of the final visible line of a frame or field and the beginning of the first visible line of the next frame. It is present in analog television, VGA, DVI and other signals. In raster cathode ray tube displays, the blank level is usually supplied during this period to avoid painting the retrace line — see raster scan for details; signal sources such as television broadcasts do not supply image information during the blanking period. Digital displays usually will not display incoming data stream during the blanking interval even if present. The VBI was originally needed because of the inductive inertia of the magnetic coils which deflect the electron beam vertically in a CRT; the magnetic field, and hence the position being drawn, cannot change instantly. Additionally, the speed of older circuits was limited. For horizontal deflection, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Closed Captioning
Closed captioning (CC) and subtitling are both processes of displaying text on a television, video screen, or other visual display to provide additional or interpretive information. Both are typically used as a transcription of the audio portion of a program as it occurs (either verbatim or in edited form), sometimes including descriptions of non-speech elements. Other uses have included providing a textual alternative language translation of a presentation's primary audio language that is usually burned-in (or "open") to the video and unselectable. HTML5 defines subtitles as a "transcription or translation of the dialogue when sound is available but not understood" by the viewer (for example, dialogue in a foreign language) and captions as a "transcription or translation of the dialogue, sound effects, relevant musical cues, and other relevant audio information when sound is unavailable or not clearly audible" (for example, when audio is muted or the viewer is deaf or hard o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antiope (teletext)
Antiope was a French teletext standard in the 1980s. It also formed the basis for the display standard used in the French videotex service Minitel. The term allegedly stood for ''Acquisition Numérique et Télévisualisation d’Images Organisées en Pages d’Écriture'', which could be loosely translated as ''Digital Acquisition and Remote Visualization of Images Organized into Written Pages''. Work on Antiope started in 1972 at CCETT, the newly merged French national research centre for television and telecommunications in Rennes, with first field trials in 1975. The system was officially launched in 1976 at Vidcom in Cannes, and simultaneously at the СПОРТ 76 exposition in Moscow. It was adopted into the international standard CCIR 653 (now ITU-R BT.653) of 1986 as CCIR Teletext System A. Antiope ceased to be used for broadcast teletext in the early 1990s, before teletext became popular in France. It was replaced by European standard World System Teletext. However, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CBS Television Network
CBS Broadcasting Inc., commonly shortened to CBS, the abbreviation of its former legal name Columbia Broadcasting System, is an American commercial broadcast television and radio network serving as the flagship property of the CBS Entertainment Group division of Paramount Global. Its headquarters is at the CBS Building in New York City. It has major production facilities and operations at the CBS Broadcast Center and the headquarters of owner Paramount Global at One Astor Plaza (both also in that city) and Television City and the CBS Studio Center in Los Angeles. It is also sometimes referred to as the Eye Network in reference to the company's trademark symbol which has been in use since 1951. It has also been called the Tiffany Network which alludes to the perceived high quality of its programming during the tenure of William S. Paley. It can also refer to some of CBS's first demonstrations of color television, which were held in the former Tiffany and Company Building in New ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
