Dynamic magnetic information storage or retrieval – Head – Core
Patent
1978-07-20
1980-05-27
Moffitt, James W.
Dynamic magnetic information storage or retrieval
Head
Core
360 10, 360 35, 370 20, 3581285, H04N 576
Patent
active
042053390
ABSTRACT:
Method and apparatus for recording a frame, comprising two fields, of document information on a disc storage device are described. The video signals corresponding to the two fields are used to amplitude modulate quadrature components of a single carrier frequency, each field modulating its own quadrature component. The quadrature amplitude modulated (QAM) carrier components are vectorially combined, the resultant being then angularly modulated on a high frequency carrier which is recorded on the disc storage device. In a preferred embodiment, a frame of information is recorded on the disc storage device along a single closed circular track. The present invention also provides methods for playing back the single track of recorded information for field-sequential video display, hard copy reproduction by a dual-line printer, or hard copy reproduction by a line-sequential printer.
REFERENCES:
patent: 3796825 (1974-03-01), Redlich et al.
patent: 3849776 (1974-11-01), Swynford-Lain
patent: 3931457 (1976-01-01), Mes
patent: 3991283 (1976-11-01), Itoh et al.
patent: 4064538 (1977-12-01), Broussaud
patent: 4130834 (1978-12-01), Mender et al.
Eastman Kodak Company
McElheny Jr. Donald E.
Moffitt James W.
Strickland Donald W.
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