Related Research Articles
Television (TV) is a telecommunication medium for transmitting moving images and sound. Additionally, the term can refer to a physical television set rather than the medium of transmission. Television is a mass medium for advertising, entertainment, news, and sports. The medium is capable of more than "radio broadcasting," which refers to an audio signal sent to radio receivers.
Philo Taylor Farnsworth was an American inventor and television pioneer. He made the critical contributions to electronic television that made possible all the video in the world today. He is best known for his 1927 invention of the first fully functional all-electronic image pickup device, the image dissector, as well as the first fully functional and complete all-electronic television system. Farnsworth developed a television system complete with receiver and camera—which he produced commercially through the Farnsworth Television and Radio Corporation from 1938 to 1951, in Fort Wayne, Indiana.
The year 1931 in television involved some significant events. Below is a list of television-related events during 1931.
David Sarnoff was a Russian and American businessman who played an important role in the American history of radio and television. He led RCA for most of his career in various capacities from shortly after its founding in 1919 until his retirement in 1970.
Vladimir Kosma Zworykin was a Russian-American inventor, engineer, and pioneer of television technology. Zworykin invented a television transmitting and receiving system employing cathode-ray tubes. He played a role in the practical development of television from the early thirties, including charge storage-type tubes, infrared image tubes and the electron microscope.
Boris Lvovich Rosing was a Russian scientist and inventor of television.
Video camera tubes are 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.
The year 1925 in science and technology involved some significant events, listed below.
The American Federation of Teachers (AFT) is the second largest teacher's labor union in America. The union was founded in Chicago. John Dewey and Margaret Haley were founders.
The year 1933 in science and technology involved some significant events, listed below.
Mechanical television or mechanical scan television is an obsolete television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror drum, to scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture. This contrasts with vacuum tube electronic television technology, using electron beam scanning methods, for example in cathode-ray tube (CRT) televisions. Subsequently, modern solid-state liquid-crystal displays (LCD) and LED displays are now used to create and display television pictures.
An image dissector, also called a dissector tube, is a video camera tube in which photocathode emissions create an "electron image" which is then swept up, down and across an anode to produce an electrical signal representing the visual image. It employs magnetic fields to keep the electron image in focus, and later models used electron multiplier to pick up the electrons. The term had also been used for other kinds of early video camera tubes. Dissectors were used only briefly for research in television systems before being replaced by different much more sensitive tubes based on the charge-storage phenomenon like the iconoscope during the 1930s. Despite the camera tubes based on the idea of image dissector technology falling quickly and completely out of use in the field of Television broadcasting, they continued to be used for imaging in early weather satellites and the Lunar lander, and for star attitude tracking in the Space Shuttle and the International Space Station.
The iconoscope was the first practical video camera tube to be used in early television cameras. The iconoscope produced a much stronger signal than earlier mechanical designs, and could be used under any well-lit conditions. This was the first fully electronic system to replace earlier cameras, which used special spotlights or spinning disks to capture light from a single very brightly lit spot.
Charles Paulson Ginsburg was an American engineer and the leader of a research team at Ampex which developed one of the first practical videotape recorders.
The concept of television is 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 medium for advertising, propaganda, and entertainment.
This is a list of American television-related events in 1931.
This is a list of American television-related events in 1933.
This is a list of American television-related events in 1930.
This is a list of American television-related events in 1929.
This is a list of American television-related events in 1925.
References
- ↑ Cooke, Lez (2015). British Television Drama: A History. Palgrave Macmillan. p. 9.
- ↑ "Radio Shows Far Away Objects in Motion". The New York Times. June 14, 1925. p. 1.
- ↑ Glinsky, Albert (2000). Theremin: Ether Music and Espionage . Urbana, Illinois: University of Illinois Press. pp. 41–45. ISBN 978-0-252-02582-2.
- ↑ Zworykin, Vladimir (November 13, 1928) [filed 1925]. "Television System". Patent No. 1,691,324. United States Patent Office. Retrieved July 28, 2009.
- ↑ Abramson, Albert, Zworykin, Pioneer of Television, University of Illinois Press, 1995, p. 51. ISBN 0-252-02104-5.
- ↑ R. W. Burns, Television: An International History of the Formative Years, p. 264.
- ↑ Crawley, John; Gangel, Jamie (April 17, 2018). "Barbara Bush, GOP matriarch and former first lady, dies at 92". CNN. Retrieved July 22, 2024.
- ↑ Genzlinger, Neil (January 8, 2019). "Mary Kay Stearns, 93, a Star of One of TV's Earliest Shows, Dies". The New York Times.
- ↑ "Rock Hudson, Screen Idol, Dies at 59".
- ↑ "Stephen Hancock obituary". TheGuardian.com . November 3, 2015.