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Television Systems Before 1940
A number of experimental and broadcast pre World War II television systems were tested. The first ones were mechanical based (mechanical television) and of very low resolution, sometimes with no sound. Later TV systems were electronic (electronic television). For a list of mechanical system tests and development, see mechanical television. For a station list see Prewar television stations France * France 1930 (mechanical): 30 lines, 12.5 frame/s * France 1932 (mechanical): 60 lines, 12.5 frame/s, 3:7 vertical aspect ratio, vertical scanning ~35×60 pixels per frame, sound, live images * France 1935-1936 (electronic): 180 lines * France 1937-1939 (electronic): 455 lines, developed by Rene Barthelemy * France 1943-1956 (electronic): 441 lines Germany * Doberitz 1932 (mechanical): 48 lines, 25 frame/s, 4:3 horizontal aspect ratio, ~64×48 pixels per frame, sound, talking movies * Berlin R.P.Z. 1932 (mechanical): 60 lines, 25 frame/s, 4:3 horizontal aspect ratio, ~83×60 pixels ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
405-line Television System
The 405-line monochrome analogue television broadcasting system was the first fully electronic television system to be used in regular broadcasting. The number of television lines influences the image resolution, or quality of the picture. It was introduced with the BBC Television Service in 1936, suspended for the duration of World War II, and remained in operation in the UK until 1985. It was also used between 1961 and 1982 in Ireland, as well as from 1957 to 1973 for the Rediffusion Television cable service in Hong Kong. Sometimes called the Marconi-EMI system, it was developed in 1934 by the EMI Research Team led by Isaac Shoenberg. The figure of 405 lines had been chosen following discussions over Sunday lunch at the home of Alan Blumlein. The system used interlacing; EMI had been experimenting with a 243-line all-electronic interlaced system since 1933. In the 405 system the scanning lines were broadcast in two complementary fields, 50 times per second, creating 25 fram ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timeline Of The Introduction Of Colour Television In Countries
This is a list of when the first color television broadcasts were transmitted to the general public. Non-public field tests, closed-circuit demonstrations and broadcasts available from other countries are not included. List in alphabetical order List of territories that never had black and white television Countries and territories that never had black and white television (i.e., their first broadcasts were in color) are not included in the table above. * * * * * ( Bechuanaland) * * * * * (Swaziland) * * * * * * * * * * (Nyasaland) * (South West Africa) * * * * * * * * * * * (Ceylon) * (Tanganyika) * * * * Zanzibar See also * Geographical usage of television * Timeline of the introduction of television in countries This is a list of when the first publicly announced television broadcasts occurred in the mentioned countries. Non-public field tests and closed circuit demonstrations are not included. This list should not be inter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timeline Of The Introduction Of Television In Countries
This is a list of when the first publicly announced television broadcasts occurred in the mentioned countries. Non-public field tests and closed circuit demonstrations are not included. This list should not be interpreted to mean the whole of a country had television service by the specified date. For example, the United States, Great Britain, Germany, and the former Soviet Union all had operational television stations and a limited number of viewers by 1939. Very few cities in each country had television service. Television broadcasts were not yet available in most places. History 1920s and 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s and 2010s See also * History of television * List of years in television * Geographical usage of television * Prewar television stations * Timeline of the introduction of color television in countries * Timeline of the introduction of radio in countries Notes and citations External links {{Telecommunications Introduct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Television
The concept of television was the work of many individuals in the late 19th and early 20th centuries. The first practical transmissions of moving images over a radio system used mechanical rotating perforated disks to scan a scene into a time-varying signal that could be reconstructed at a receiver back into an approximation of the original image. Development of television was interrupted by the Second World War. After the end of the war, all-electronic methods of scanning and displaying images became standard. Several different standards for addition of color to transmitted images were developed with different regions using technically incompatible signal standards. Television broadcasting expanded rapidly after World War II, becoming an important mass media, mass medium for advertising, propaganda, and entertainment. Television broadcasts can be distributed over the air by VHF and UHF radio signals from terrestrial transmitting stations, by microwave signals from Earth orbi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timeline Of The BBC
This is a timeline of the history of the British Broadcasting Corporation (and its predecessor, the British Broadcasting Company). 1920s * 1922 ** 18 October – The British Broadcasting Company is formed. ** 14 November – Following the closure of numerous amateur stations, the first BBC broadcasts from London (station 2LO). ** 15 November – First broadcasts from Birmingham (station 5IT) and Manchester (station 2ZY). ** 14 December - 33-year-old John Charles Walsham Reith becomes General Manager of the BBC. ** 24 December – First broadcast from Newcastle upon Tyne (station 5NO). * 1923 ** 8 January – First outside broadcast, the British National Opera Company's production of ''The Magic Flute'' from Covent Garden. ** 18 January – The UK Postmaster General grants the BBC a licence to broadcast. ** 13 February – First broadcast from Cardiff (station 5WA). ** 6 March – First broadcast from Glasgow (station 5SC). ** 6 June – Edgar Wallace makes a report on Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andrea Electronics
Andrea Electronics Corporation is an American software, technology, and manufacturing corporation headquartered in Bohemia, New York. History and products Andrea Electronics was founded as Andrea Radio Corporation in 1934 by Frank A. D. Andrea Sr. In the 1960s, the company designed the intercom communication system used in the first crewed Mercury space flight capsule as well as military intercoms for helicopters and the F-16 fighter jet. In 1998, the company pioneered microphone array technology, which has become a standard for hands-free VoIP communication embedding its advanced noise-cancellation technology into millions of computers produced by global manufacturers, including Dell and Hewlett-Packard. In more recent years, it began manufacturing its own brand of headsets known as SuperBeam headsets. The company has created boom-free, all-purpose headsets essentially applying its microphone array technology to the headset industry. After 75 years of predominantly w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DuMont Laboratories
Allen B. DuMont Laboratories, Inc. (printed on products as Allen B. Du Mont Laboratories, Inc., commonly referred to as DuMont Laboratories, shortened to DuMont Labs; referred to on company documents as DuMont) was an American television equipment manufacturer and broadcasting company. At one point it owned TV stations WABD (now WNYW; FOX O&O), KCTY (defunct; DuMont affiliate), W2XVT (experimental; defunct; DuMont affiliate), KE2XDR (experimental; defunct; DuMont affiliate), & WDTV (now KDKA-TV; CBS O&O), as well as WTTG (FOX O&O), all former affiliates of its defunct DuMont Television Network. The company was founded in 1931, in Upper Montclair, by inventor Allen B. DuMont, with its headquarters in nearby Clifton. Among the company's developments were durable cathode ray tubes (CRTs) that would be used for TV and its magic eye tube. History In 1938, DuMont Labs began manufacturing televisions at a factory in nearby Passaic, New Jersey. To sell TVs, it began the DuMont T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Electric
General Electric Company (GE) is an American multinational conglomerate founded in 1892, and incorporated in New York state and headquartered in Boston. The company operated in sectors including healthcare, aviation, power, renewable energy, digital industry, additive manufacturing and venture capital and finance, but has since divested from several areas, now primarily consisting of the first four segments. In 2020, GE ranked among the Fortune 500 as the 33rd largest firm in the United States by gross revenue. In 2011, GE ranked among the Fortune 20 as the 14th most profitable company, but later very severely underperformed the market (by about 75%) as its profitability collapsed. Two employees of GE – Irving Langmuir (1932) and Ivar Giaever (1973) – have been awarded the Nobel Prize. On November 9, 2021, the company announced it would divide itself into three investment-grade public companies. On July 18, 2022, GE unveiled the brand names of the companies it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Los Angeles
Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the List of municipalities in California, largest city in the U.S. state, state of California and the List of United States cities by population, second most populous city in the United States after New York City, as well as one of the world's most populous megacities. Los Angeles is the commercial, financial, and cultural center of Southern California. With a population of roughly 3.9 million residents within the city limits , Los Angeles is known for its Mediterranean climate, ethnic and cultural diversity, being the home of the Cinema of the United States, Hollywood film industry, and its Greater Los Angeles, sprawling metropolitan area. The city of Los Angeles lies in Los Angeles Basin, a basin in Southern California adjacent to the Pacific Ocean in the west and extending through the Santa Monica Mountains and north into the San Fernando Valley, with the city bordering the San Gabri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philco
Philco (an acronym for Philadelphia Battery Company) is an American electronics industry, electronics manufacturer headquartered in Philadelphia. Philco was a pioneer in battery, radio, and television production. In 1961, the company was purchased by Ford Motor Company, Ford and, from 1966, renamed "Philco-Ford". Ford sold the company to GTE in 1974, and it was purchased by Philips in 1981. In North America, the Philco brand is currently owned by Philips. In other markets, the Philco International brand is owned by Electrolux. In the early 1920s, Philco made storage batteries, "socket power" battery eliminator units (plug-in transformers), and battery chargers. With the invention of the rectifier tube, which made it practical to power radios by electrical outlets, in 1928, Philco entered the radio business. They followed other radio makers such as RCA, Atwater-Kent, Zenith Electronics, Freshman Masterpiece, FADA Radio (Frank A. D'Andrea Radio), and AH Grebe into the battery-powere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philadelphia
Philadelphia, often called Philly, is the List of municipalities in Pennsylvania#Municipalities, largest city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, the List of United States cities by population, sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic (United States), Mid-Atlantic regions after New York City. Act of Consolidation, 1854, Since 1854, the city has been coextensive with Philadelphia County, Pennsylvania, Philadelphia County, the List of counties in Pennsylvania, most populous county in Pennsylvania and the urban core of the Delaware Valley, the Metropolitan statistical area, nation's seventh-largest and one of List of largest cities, world's largest metropolitan regions, with 6.245 million residents . The city's population at the 2020 United States census, 2020 census was 1,603,797, and over 56 million people live within of Philadelphia. Philadelphia was founded in 1682 by William Penn, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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