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Helical scan is a method of recording high-frequency signals on
Bcn-scanner-head.jpg, Type B videotape video scanner head
Vxa1-drive-nocover-nobezel-front.jpg, rotary head visible in a VXA computer tape drive
Vxa1-drive-nocover-top-front.jpg, VXA tape drive, alternate view of rotary head and loading mechanism
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 mag ...
. 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 ...
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 recordi ...
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 pool, patent trust owned by General Electric (GE), Westinghouse Electric Corporation, Westin ...
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
See also
*Type A videotape
1-inch type A (designated Type A by SMPTE) is a reel-to-reel helical scan analog recording videotape format developed by Ampex in 1965, that was one of the first standardized reel-to-reel magnetic tape formats in the 1–inch (25 mm) ...
*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 1 ...
*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 broadcas ...
*IVC videotape format
IVC 2 inch Helical scan was a high-end broadcast quality helical scan analog recording VTR format developed by International Video Corporation (IVC), and introduced in 1975. Previously, IVC had made a number of 1 inch Helical VTRs. IVC ...
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 ...
(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 ...
*Ampex 2 inch helical VTR
From 1963 to 1970, Ampex manufactured several models of VTR 2-inch helical VTRs, capable of recording and playing back analog black and white video. Recording employed non-segmented helical scanning, with one wrap of the tape around the video hea ...
*Symmetric Phase Recording Symmetric Phase Recording is a tape recording (Computer storage media) technology developed by Quantum Corporation packs data across a tape's recording surface by writing adjacent tracks in a herringbone pattern:
track 0 = \\\\\, track 1 = /////, t ...
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