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Helical scan is a method of recording high-frequency signals on magnetic tape. 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 u ...
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 from
RCA 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 Schüller 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

Bcn-scanner-head.jpg,
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 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit of counting or measurement. For example, a line segment of ''unit length'' is a line segment of length&n ...
*
1 inch type C videotape 1–inch Type C (designated Type C by SMPTE) is a professional reel-to-reel analog recording helical scan videotape format co-developed and introduced by Ampex and Sony in 1976. It became the replacement in the professional video and broadc ...
* 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 u ...
(VTR) * Vision Electronic Recording Apparatus * 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