Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1989-04-10
1990-10-23
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
360 40, 360 65, G11B 509, G11B 1514
Patent
active
049658735
ABSTRACT:
Magnetic recording of a data contiuum is effected by means of sequential impulses of recording current. The impulses occur at substantially regular intervals providing samples of the data continuum. The impulses are of very short time duration, in that each impulse extends for only a fraction of the time interval that is required for a point on the record medium to traverse the effective recording field of the record head. The time spacing between impulses is approximately equal to said time interval, thereby providing a magnetic recording continuum corresponding to said data continumm. Certain of said impulses are indicative of data transitions, and other of said impulses are sustaining impulses occurring between data transition impulses. The sustaining impulses are of the same polarity sense as the respective immediately preceding transition impulse, but of lesser amplitude to obtain magnetic recording equalization over the recorded continuum between successive transition impulses. The sustaining impulses may be of a pilot signal frequency derived from the data clock signal, and are preferably made phase coherent with the transition impulses by anticipatory adaption, so as to be always constructively additive thereto.
REFERENCES:
patent: 4562491 (1985-12-01), Kawabara et al.
"Write Equalization in High-Linear-Density Magnetic Recording", by R. C. Schneider, IBM J. Res. Rev., vol. 29, #6, 11/85.
Canney Vincent P.
Haskell Boris
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