Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1987-07-06
1989-02-28
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
360 51, 360 40, 360 41, G11B 509
Patent
active
048090921
ABSTRACT:
For recording digital data on a magnetic recording medium, binary data signals and magnetic bias signals having a constant repetition rate are synchronized in terms of phase, are overlaid, and are subsequently supplied to a magnetic head. The phase-oriented synchronization thus occurs since the chronological spacings between two successive signal edges of the magnetic bias signals between two successive signal edges of the data signals given a plurality of magnetic bias signals are modified such that the directions of the signal edges of the data signals coincide with the directions of the corresponding signal edges of the magnetic bias signals. The sums of the components having a first binary value and a second binary value of the magnetic bias signals are identical. Preferably, the distances between two successive signal edges of each of two magnetic bias signals are respectively shortened by half between two edges of a data signal.
REFERENCES:
patent: 4202017 (1980-05-01), Geffon et al.
patent: 4367496 (1983-01-01), Lesieur
patent: 4420776 (1983-12-01), Jove et al.
patent: 4547818 (1985-10-01), Lia
Cardillo Raymond F.
Fournier Kevin
Tandberg Data A/S
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