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Phonovision
Phonovision was a patented concept to create pre-recorded mechanically scanned television recordings on gramophone records. Attempts at developing Phonovision were undertaken in the late 1920s in London by its inventor, Scottish television pioneer John Logie Baird. The objective was not simply to record video, but to record it synchronously, as Baird intended playback from an inexpensive playback device, which he called a 'Phonovisor'. Baird stated that he had several records made of the sound of the vision signal but that the quality was poor. Unlike Baird's other experiments (including stereoscopy, colour and infra-red night-vision), there is no evidence of him having demonstrated playback of pictures, though he did play back the sound of the vision signal to audiences. Baird moved on leaving behind several discs in the hands of museums and favoured company members. Until 1982, this was the extent of knowledge regarding Phonovision. Discoveries and restoration From 1982, Donald ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mechanical Television
Mechanical television or mechanical scan television is an obsolete television system that relies on a mechanism (engineering), 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. Mechanical scanning methods were used in the earliest experimental television systems in the 1920s and 1930s. One of the first experimental wireless television transmissions was by Scottish inventor John Logie Baird on October 2, 1925, in London. By 1928 many radio stations were broadcasting experimental television programs using mechanical systems. Howeve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Logie Baird
John Logie Baird (; 13 August 188814 June 1946) was a Scottish inventor, electrical engineer, and innovator who demonstrated the world's first mechanical Mechanical television, television system on 26 January 1926. He went on to invent the first publicly demonstrated colour television system and the first viable purely electronic Color television, colour television picture tube. In 1928, the Baird Television Development Company achieved the first transatlantic television transmission. Baird's early technological successes and his role in the practical introduction of broadcast television for home entertainment have earned him a prominent place in television's history. In 2006, Baird was named as one of the 10 greatest Scottish scientists in history, having been listed in the National Library of Scotland's 'Scottish Science Hall of Fame'. In 2015, he was inducted into the Scottish Engineering Hall of Fame. In 2017, IEEE unveiled a bronze street plaque at 22 Frith Street (Bar I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SelectaVision
SelectaVision was a trademark name used on four classes of device by the Radio Corporation of America: * The Holotape, a prototype video medium * Magnetic tape * VHS videocassette recorders, and * Capacitance Electronic Disc videodisc players and the discs themselves, introduced in 1981. Capacitance Electronic Disc's competitors, Philips/Magnavox and Pioneer, instead manufactured optical discs, read with lasers.On April 4, 1984, RCA, having sold only 550,000 players, ended sales, losing $580 million. The losses resulted in General Electric's acquisition of RCA in 1986, and the "SelectaVision" brand was abandoned. See also * Video High Density (JVC, 1970) * Electronic Video Recording (CBS, 1967) * Phonovision Phonovision was a patented concept to create pre-recorded mechanically scanned television recordings on gramophone records. Attempts at developing Phonovision were undertaken in the late 1920s in London by its inventor, Scottish television pionee ... (Baird, 1928) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gramophone Record
A phonograph record (also known as a gramophone record, especially in British English) or a vinyl record (for later varieties only) is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove. The groove usually starts near the outside edge and ends near the center of the disc. The stored sound information is made audible by playing the record on a phonograph (or "gramophone", "turntable", or "record player"). Records have been produced in different formats with playing times ranging from a few minutes to around 30 minutes per side. For about half a century, the discs were commonly made from shellac and these records typically ran at a rotational speed of 78 rpm, giving it the nickname "78s" ("seventy-eights"). After the 1940s, "vinyl" records made from polyvinyl chloride (PVC) became standard replacing the old 78s and remain so to this day; they have since been produced in various sizes and speeds, most commonly 7-inch discs pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Television Electronic Disc
Television Electronic Disc (TeD) is a discontinued video recording format, released in 1975 by Telefunken and Teldec. The format used flexible foil discs, which spun at 1,500 rpm on a cushion of air. TeD never gained wide acceptance, and could not compete against the emerging videocassette systems of the time. History Initially known as "The Video Disc" or the Teldec Television Disc, TeD (Television Electronic Disc) was first announced at a press conference in Berlin on June 24, 1970. It was developed by a team from two German companies: AEG-Telefunken and Teldec. Program information was stored in the form of ridges in the surface of a thin, flexible foil disc, which was claimed to be sufficiently robust to withstand being played 1,000 times. The main technological breakthrough was the vertical recording method that reduced the track pitch to 0.007 mm, and increased the rotation speed to 1,500 rpm, making it possible to record 130–150 grooves per millimeter, c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capacitance Electronic Disc
The Capacitance Electronic Disc (CED) is an analog video disc playback system developed by Radio Corporation of America (RCA), in which video and audio could be played back on a TV set using a special stylus and high-density groove system similar to phonograph records. First conceived in 1964, the CED system was widely seen as a technological success which was able to increase the density of a long-playing record by two orders of magnitude. Despite this achievement, the CED system fell victim to poor planning, various conflicts with RCA management, and several technical difficulties that slowed development and stalled production of the system for 17 years—until 1981, by which time it had already been made obsolete by laser videodisc ( DiscoVision, later called LaserVision and LaserDisc) as well as Betamax and VHS video cassette formats. Sales for the system were nowhere near projected estimates. In the spring of 1984, RCA announced it was discontinuing player production, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aluminum Disc
In the field of audio recording, an aluminum disc (aluminium in the UK and elsewhere) is a phonograph (gramophone in the UK) record made of bare aluminum, a medium introduced in the late 1920s for making one-off recordings. Although sometimes used for making amateur studio or home recordings or in coin-operated "record-your-voice" booths at fairs and arcades, during the first half of the 1930s bare aluminum discs were primarily used to record radio broadcasts for the private transcription disc archives of performers or sponsors.''Documenting Early Radio: A Review of Existing Pre-1932 Radio Recordings'' Elizabeth McLeod, 1988-9 |
Conventional Wisdom
The conventional wisdom or received opinion is the body of ideas or explanations generally accepted by the public and/or by experts in a field. History The term "conventional wisdom" dates back to at least 1838, as a synonym for "commonplace knowledge". It was used in a number of works, occasionally in a benign''E.g.,'1 Nahum Capen, ''The History of Democracy'' (1874), page 477("millions of all classes alike are equally interested and protected by the practical judgment and conventional wisdom of ages"). or neutral''E.g.,'"Shallow Theorists", ''American Educational Monthly'' 383 (Oct. 1866)("What is the result? Just what conventional wisdom assumes it would be."). sense, but more often pejoratively.''E.g.,'Joseph Warren Beach, ''The Technique of Thomas Hardy'' (1922), page 152("He has not the colorless monotony of the business man who follows sure ways to success, who has conformed to every rule of conventional wisdom, and made himself as featureless as a potato field, as tame as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Betty Bolton
Betty Bolton (7 January 1906 – 2 April 2005) was a British actress, beginning as a child star during World War I and continuing her career in the 1920s and 1930s. She was one of the first performers to appear on early British television. Early life and career Bolton made her debut in 1916, at the age of 10, in a revue called ''Some'', at the Vaudeville Theatre in London. Gertrude Lawrence was the principal dancer. Bolton's mother Maud was a West End stage manager. 'Betty', as she was originally billed (no surname), played in several revues by Harry Grattan, such as ''Odds and Ends'' and ''Mind Your Backs'' during World War I, some of them produced by Andr Charlot, playing precocious children. Photographs from two of these revues, including ''Cheep'' (1917) and ''Back Again'' (1919), show her remarkable powers of facial expression. The last show in which she performed as a child was the musical fantasy ''Fifinella'', in late 1919. Adult career Bolton was a versatile perform ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
