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Vitascan
{{More citations needed, date=July 2021 Vitascan (sometimes alternately spelled VitaScan) was an early color television camera system developed by American television equipment manufacturer DuMont Laboratories. Development began in 1949 and the product was released on an experimental basis in 1956. Vitascan was fully compatible with the NTSC color system, and DuMont Labs hoped the system would catch on in the television industry. However, Vitascan cameras only worked indoors, due to Vitascan being in essence a flying-spot scanner based system. The system's camera basically worked in reverse by projecting a light through the camera's lens onto the subject from a cathode ray tube, or CRT, mounted behind the lens (instead of a pickup tube like conventional television cameras), providing the "flying spot". Four photomultiplier tubes (two for red, one for green, and one for blue) mounted inside special "scoops" placed in the studio and pointed at the subject would pick up the ligh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flying-spot Scanner
A flying-spot scanner (FSS) uses a scanning source of a spot of light, such as a high-resolution, high-light-output, low-persistence cathode ray tube (CRT), to scan an image. Usually the image to be scanned is on photographic film, such as motion picture film, or a slide or photographic plate. The output of the scanner is usually a television signal. Basic principle In the case of the CRT-based scanner, as an electron beam is drawn across the face of the CRT it creates a scan that has the correct number of lines and aspect ratio for the format of the signal. The image of this scan is focused with a lens onto the film frame. Its light passes through the image being scanned and is converted to a proportional electrical signal by photomultiplier tube(s), one for each color (red, green, blue), that detects the variations in intensity of the beam spot as it scans across the film, and are converted to proportional electrical signals, one for each of the color channels. Telecines that u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WITI (TV)
WITI (channel 6) is a television station in Milwaukee, Wisconsin, United States, airing programming from the Fox network. Owned and operated by the network's Fox Television Stations division, WITI maintains studios on North Green Bay Road (WIS 57) in Brown Deer (though with a Milwaukee postal address), and its transmitter is located on East Capitol Drive (just north of WIS 190) in Shorewood. History Early history The station first signed on the air on May 21, 1956, operating as an independent station; it was originally owned by Independent Television, Inc., to whom the channel 6 construction permit was granted by the Federal Communications Commission (FCC) on June 11, 1955. The station was originally licensed to the North Shore village of Whitefish Bay on a technicality in order to address short-spacing concerns with Davenport, Iowa station WOC-TV (now KWQC-TV, which also broadcast on channel 6) before the FCC fully finessed spacing among television station signals in diff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Color Television
Color television or Colour television is a television transmission technology that includes color information for the picture, so the video image can be displayed in color on the television set. It improves on the monochrome or black-and-white television technology, which displays the image in shades of gray (grayscale). Television broadcasting stations and networks in most parts of the world upgraded from black-and-white to color transmission between the 1960s and the 1980s. The invention of color television standards was an important part of the history and technology of television. Transmission of color images using mechanical scanners had been conceived as early as the 1880s. A demonstration of mechanically scanned color television was given by John Logie Baird in 1928, but its limitations were apparent even then. Development of electronic scanning and display made a practical system possible. Monochrome transmission standards were developed prior to World War II, but civili ... [...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 Televis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1949 In Television
The year 1949 in television involved some significant events. Below is a list of television-related events during 1949. __TOC__ Events * January 3: ''Colgate Theatre'' premieres on NBC. * January 11: A two-hour special on all American networks celebrates the linking of the eastern and midwestern networks via coaxial cable. * January 21: ''Your Show Time'' becomes the first filmed dramatic series on American network television. * January 31: The first Emmy Awards are presented and broadcast on television from Los Angeles. * May: The first telethon, benefitting the Damon Runyon Cancer Fund, is hosted by Milton Berle and lasts for 24 hours. * August 25: RCA announces the development of a compatible color TV system. * December 17: The Sutton Coldfield television transmitter is opened in the English Midlands, making it the first part of the UK outside London to receive BBC Television. * December 29: KC2XAK of Bridgeport, Connecticut becomes the first Ultra high frequency (UHF) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1956 In Television
The year 1956 in television involved some significant events. Below is a list of television-related events during 1956. Events *January 1 – Beleteleradio begins transmissions as the first television channel in Belarus. *January 25–February 5 – The 1956 Winter Olympics in Italy are the first to be broadcast to an international audience. The Soviet Union uses its technological influence to broadcast the Cortina Winter Games to a western audience from a communist point of view. *January 28 – Elvis Presley makes his national television debut on CBS in the United States on the program ''Stage Show'', the first of six appearances on the series. *January 30 - NBC swaps its Cleveland radio and TV stations to Westinghouse Broadcasting in exchange for Westinghouse's own Philadelphia radio and TV stations. The trade was eventually reversed in 1965. *February 14 – Television broadcasting begins in Azerbaijan, at this time the Azerbaijan Soviet Socialist Republic. *February 17 – Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NTSC
The first American standard for analog television broadcast was developed by National Television System Committee (NTSC)National Television System Committee (1951–1953), Report and Reports of Panel No. 11, 11-A, 12–19, with Some supplementary references cited in the Reports, and the Petition for adoption of transmission standards for color television before the Federal Communications Commission, n.p., 1953], 17 v. illus., diagrs., tables. 28 cm. LC Control No.:5402138Library of Congress Online Catalog/ref> in 1941. In 1961, it was assigned the designation CCIR System M, System M. In 1953, a second NTSC standard was adopted, which allowed for color television broadcast compatible with the existing stock of black-and-white receivers. It is one of three major color formats for analog television, the others being PAL and SECAM. NTSC color is usually associated with the System M. The only other broadcast television system to use NTSC color was the System J. Since the introdu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cathode Ray Tube
A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms ( oscilloscope), pictures (television set, computer monitor), radar targets, or other phenomena. A CRT on a television set is commonly called a picture tube. CRTs have also been used as memory devices, in which case the screen is not intended to be visible to an observer. The term ''cathode ray'' was used to describe electron beams when they were first discovered, before it was understood that what was emitted from the cathode was a beam of electrons. In CRT television sets and computer monitors, the entire front area of the tube is scanned repeatedly and systematically in a fixed pattern called a raster. In color devices, an image is produced by controlling the intensity of each of three electron beams, one for each additive primary color (red, green, and bl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pickup Tube
Video camera tubes were devices based on the cathode ray tube that were used in television cameras to capture television images, prior to the introduction of charge-coupled device (CCD) image sensors in the 1980s. Several different types of tubes were in use from the early 1930s, and as late as the 1990s. In these tubes, an cathode ray, electron beam was scanned across an image of the scene to be broadcast focused on a target. This generated a current that was dependent on the brightness of the image on the target at the scan point. The size of the striking ray was tiny compared to the size of the target, allowing 483 horizontal scan lines per image in the NTSC format, 576 lines in PAL, and as many as 1035 lines in Multiple sub-Nyquist sampling encoding, Hi-Vision. Cathode ray tube Any vacuum tube which operates using a focused beam of electrons, originally called cathode rays, is known as a cathode ray tube (CRT). These are usually seen as display devices as used in older (i.e. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photomultiplier Tube
Photomultiplier tubes (photomultipliers or PMTs for short) are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. They are members of the class of vacuum tubes, more specifically vacuum phototubes. These detectors multiply the current produced by incident light by as much as 100 million times or 108 (i.e., 160 dB),Decibels are power ratios. Power is proportional to I2 (current squared). Thus a current gain of 108 produces a power gain of 1016, or 160 dB in multiple dynode stages, enabling (for example) individual photons to be detected when the incident flux of light is low. The combination of high gain, low noise, high frequency response or, equivalently, ultra-fast response, and large area of collection has maintained photomultipliers an essential place in low light level spectroscopy, confocal microscopy, Raman spectroscopy, fluorescence spectroscopy, nuclear and particle physics, astronomy, medical ... [...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] |
Milwaukee, Wisconsin
Milwaukee ( ), officially the City of Milwaukee, is both the most populous and most densely populated city in the U.S. state of Wisconsin and the county seat of Milwaukee County, Wisconsin, Milwaukee County. With a population of 577,222 at the 2020 United States census, 2020 census, Milwaukee is the List of United States cities by population, 31st largest city in the United States, the fifth-largest city in the Midwestern United States, and the second largest city on Lake Michigan's shore behind Chicago. It is the main cultural and economic center of the Milwaukee metropolitan area, the fourth-most densely populated metropolitan area in the Midwestern United States, Midwest. Milwaukee is considered a global city, categorized as "Gamma minus" by the Globalization and World Cities Research Network, with a regional List of U.S. metropolitan areas by GDP, GDP of over $102 billion in 2020. Today, Milwaukee is one of the most ethnicity, ethnically and Cultural diversity, cult ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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