Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1974-10-03
1982-03-30
Faber, Alan
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360122, 3581285, 369111, H04N 578
Patent
active
043227597
ABSTRACT:
The video or television signals are broken into numerous elements representing spaced portions of the video display screen along the line sweep, and imprints (electrical or optical) for each element are made in a path on a rotating medium which may be a disc, drum or belt. The lineal length of each imprint on the path is determined by the light characteristic of the video signal being recorded. Clock marks are permanently recorded in a separate path on the rotating medium, one for each spacing of the line elements, to accurately locate the elements on the rotating medium and thereby accurately locating the elements on the screen when the information is decoded. For the U.S. television operational mode, one rotation of the rotating medium takes place in 1/30 of a second to give a complete picture frame, including interlacing.
Maximum density of imprints is achieved by using an extremely narrow width of about one ten thousandth to one thousandth of an inch wide, and not only make adjacent tracks contiguous, but actually overlapping. This is accomplished by a highly efficient transducer in contact with the recording medium and to prevent this razor edge transducer from cutting the recording medium, a body surrounds the transducer structure to give a non-cutting bearing force per unit of area.
The method and apparatus permit transcribing broadcast television signals or transcribing directly from a television set, and also permit playing of previously recorded video signals directly into a television set.
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Bissell Henry M.
Faber Alan
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