helical scan on:
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Helical scan is a method of recording high-frequency signals on
Bcn-scanner-head.jpg,
Sony U.S. patent for U-matic videotape cassette
filed 1971.
Sony U.S. patent for design of U-matic deck
filed 1971.
video preservation and conservation museum
* The history of television, 1942 to 2000 By Albert Abramson, page 93.
Ampex page
in the Experimental TV Center {{Homevid Audiovisual introductions in 1953 Film and video technology Japanese inventions Tape recording
Helical scan is a method of recording high-frequency signals on magnetic tape
Magnetic tape is a medium for magnetic storage made of a thin, magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany in 1928, based on the earlier magnetic wire recording from Denmark. Devices that use magne ...
. It is used in open-reel video tape recorder
A video tape recorder (VTR) is a tape recorder designed to record and playback video and audio material from magnetic tape. The early VTRs were open-reel devices that record on individual reels of 2-inch-wide (5.08 cm) tape. They were use ...
s, video cassette recorder
A videocassette recorder (VCR) or video recorder is an electromechanical device that records analog audio and analog video from broadcast television or other source on a removable, magnetic tape videocassette, and can play back the recordin ...
s, digital audio tape recorders, and some computer tape drive
A tape drive is a data storage device that reads and writes data on a magnetic tape. Magnetic tape data storage is typically used for offline, archival data storage. Tape media generally has a favorable unit cost and a long archival stability.
...
s.
History
Earl E Masterson fromRCA
The RCA Corporation was a major American electronics company, which was founded as the Radio Corporation of America in 1919. It was initially a patent trust owned by General Electric (GE), Westinghouse, AT&T Corporation and United Fruit Comp ...
patented the first helical scan method in 1950 after stealing it from German engineer Eduard Schüller
Eduard Model Accessories is a Czech manufacturer of plastic models and finescale model accessories.
Formed in 1989 in the city of Most, Eduard began in a rented cellar as a manufacturer of photoetched brass model components. Following the succ ...
. Eduard Schüller
Eduard Model Accessories is a Czech manufacturer of plastic models and finescale model accessories.
Formed in 1989 in the city of Most, Eduard began in a rented cellar as a manufacturer of photoetched brass model components. Following the succ ...
developed an actually working helical scan method of recording in 1953 while working at AEG. With the advent of television broadcasting in Japan in the early 1950s, they saw the need for magnetic television signal recording. Dr. Kenichi Sawazaki developed a prototype helical scan recorder in 1954.
Gallery
Type B videotape
1–inch type B VTR (designated Type B by SMPTE) is a reel-to-reel analog recording video tape format developed by the Bosch Fernseh division of Bosch in Germany in 1976. The magnetic tape format became the broadcasting standard in continen ...
video scanner head
Vxa1-drive-nocover-nobezel-front.jpg, rotary head visible in a VXA
VXA is a tape backup format originally created by Ecrix and now owned by Tandberg Data. After the merger between Ecrix and Exabyte on 17 November 2001, VXA was produced by Exabyte Corporation. On November 20, 2006, Exabyte was purchased by Tandber ...
computer tape drive
Vxa1-drive-nocover-top-front.jpg, VXA tape drive, alternate view of rotary head and loading mechanism
See also
* Type A videotape * 1 inch type B videotape * 1 inch type C videotape * IVC videotape format about the IVC 2 inch helical VTR, Model 9000 *Video tape recorder
A video tape recorder (VTR) is a tape recorder designed to record and playback video and audio material from magnetic tape. The early VTRs were open-reel devices that record on individual reels of 2-inch-wide (5.08 cm) tape. They were use ...
(VTR)
*Vision Electronic Recording Apparatus
Vision Electronic Recording Apparatus (VERA) was an early analog recording videotape format developed from 1952 by the BBC under project manager Dr Peter Axon.
History
In order to record high frequencies, a tape must move rapidly with respect to ...
* Ampex 2 inch helical VTR
* Symmetric Phase Recording
References
External links
Sony U.S. patent for U-matic videotape cassette
filed 1971.
Sony U.S. patent for design of U-matic deck
filed 1971.
video preservation and conservation museum
* The history of television, 1942 to 2000 By Albert Abramson, page 93.
Ampex page
in the Experimental TV Center {{Homevid Audiovisual introductions in 1953 Film and video technology Japanese inventions Tape recording