Di-gap, variable-frequency recording technique and associated sy

Details Di-gap, variable-frequency recording technique and associated sy Di-gap, variable-frequency recording technique and associated sy

1978-10-02

1980-06-24

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 21, G11B 556, G11B 2110

Patent

active

042098106

ABSTRACT:
Techniques and associated apparatus for recording and detecting data; and especially for detecting and processing recorded data with greater accuracy.
Recording information (computer data bits) is recorded in "A-form" or "B-form" as oblique parallel marks along adjacent information strips (tracks) on a medium, using a "di-gap" transducer system comprising at least one related pair of transducer gaps aligned to register and sense information along a common record track, with the gaps being skewed oblique to the track direction, and aligned transverse to one another to register with respective A-form or B-form marks.
One form of mark is preferably recorded along the ODD-number tracks, at a first frequency (f.sub.1) while the other form of mark is recorded along the EVEN-number tracks at a second, different frequency (f.sub.2). Output detect means are arranged to distinguish between these frequencies for improved recording (--e.g., head-position-servo control).

REFERENCES:
patent: 2929670 (1960-03-01), Garrity
patent: 2938962 (1960-05-01), Konins et al.
patent: 3185972 (1965-05-01), Sippel
patent: 3404392 (1968-10-01), Sordello
patent: 3665118 (1972-05-01), Cooper, Jr.
patent: 3678220 (1972-07-01), Luhrs
patent: 3686649 (1972-08-01), Behr
patent: 4007493 (1977-02-01), Behr et al.
patent: 4074328 (1978-02-01), Hardwick
IBM/TDB. vol. 4, No. 5, Oct. 1961, pp. 24-25, "Transducer Position Sensor" by G.N. Tsilibes.
IBM/TDB. vol. 5, No. 1, Jun. 1962, p.33, "Magnetic Head Positioning" by W. Buslik.
IBM/TDB. vol. 17, No. 4, Sep. 1974, pp. 1168-1169, "Phase Sensing Magnetic Recording Head" by R. Jansen.

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