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Encyclopedia > Television Electronic Disc
An Ad for the TeD

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 0.007mm, and increased the rotation speed to 1,500 rpm, making it possible to record 130-150 grooves per millimeter, compared with the typical 10-13 grooves on an audio disc. This increased the available bandwidth from around 15 kHz to 3 MHz. The tracks were read by a pressure pick-up, which translated the surface of the ridges, via a piezo-electric crystal, into an electrical signal. Tracking was controlled not by the pick-up resting within the walls of a groove, but by a mechanical coupling on which the pick-up mounting is supported. There was no turntable. The rotation of the disc at 1,500 rpm created a thin cushion of air between the disc and a fixed plate. Vertical movement of the disc was kept to within 0.05mm. Eight-inch discs could store five minutes of programming, twelve-inch discs about 7½ minutes. Image File history File links Broom_icon. ... Image File history File links Ted. ... rpm or RPM may mean: revolutions per minute RPM Package Manager (originally called Red Hat Package Manager) RPM (movie) RPM (band), a Brazilian rock band RPM (magazine), a former Canadian music industry magazine In firearms, Rounds Per Minute: how many shots an automatic weapon can fire in one minute On... Grooves logo (2005-current) Grooves is an American electronic music magazine founded in 1998 by editor Sean Portnoy, initially concentrating on the then-burgeoning IDM music genre and expanding to its more experimental, abstract offshoots, such as microsound, microhouse and glitch, eventually encompassing a global view of musicians and cross... A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). ... A megahertz (MHz) is one million (106) hertz, a measure of frequency. ... peizo This page is a candidate for speedy deletion. ...


Marketing

By autumn 1972, the name of the system had just been changed to TeD (for Television Disc) and the playing time of the eight-inch disc had been doubled to 10 minutes. TeD players were finally introduced on the West German market on 17 March 1975. Six labels offered programs: Decca, Teldec Intertel, Telefunken, Ufa/ATB, Ullstein AV and Videophon. Within the first three months 6,000 players had been shipped to 2,500 dealers and 50,000 discs were in the shops. Japan's Sanyo Electric, which had been conducting similar research itself (but was by now also developing the V-Cord videocassette recorder), was granted a licence to produce a version that would play out in the NTSC television format and by the end of 1976 had devised a long-awaited autochanger that took 12 10-minute discs. Also in Japan, General Corporation took a manufacturing licence in July 1976 with an expectation of coming to market in April 1977. A software consortium, Nippon Video Systems, was formed around the same time. By the end of 1978 Telefunken itself had adopted VHS. Decca may refer to: Decca Records, a 1929 British record label, also known as Decca Music Group Decca Radar (later Racal-Decca Marine), a British marine electronics manufacturer, a spin-off from the gramophone and records company Decca tree, a microphone recording system London Decca, a maker of turntable tonearms... Telefunken is a German radio- and television company, founded in 1903. ...


References

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