Magnetic disk track following servo burst amplitude drop compens

Details Magnetic disk track following servo burst amplitude drop compens Magnetic disk track following servo burst amplitude drop compens

1982-03-29

1984-03-20

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 381, 318563, G11B 558, G11B 2110

Patent

active

044384670

ABSTRACT:
To compensate for drops in the amplitude of signals read from magnetic records, in particular servo signals, a complementary correction signal is produced from the signal drops by rectifying, low-pass filtering, differentiating, integrating and forming the absolute value. This complementary correction signal is added to the defective signal to obtain a signal which has roughly been corrected to the original magnitude prior to evaluating and forming the position error signal (PES).

REFERENCES:
patent: 3185972 (1965-05-01), Sippel
patent: 3309460 (1967-03-01), Rank
patent: 3463982 (1969-08-01), Eldridge
patent: 3691543 (1972-09-01), Mueller
patent: 3911208 (1975-10-01), Tehma
patent: 3947873 (1976-03-01), Buchan
patent: 4285015 (1981-08-01), Rose et al.
patent: 4412165 (1983-10-01), Case et al.
IBM-TDB vol. 20, No. 1, Jun. 1977, pp. 38-41, Servo Error Detection Using Pointers, Gardner et al.
Malone, "Dynamic Write Precompensation", IBM TDB, vol. 22, No. 5, 10-79, p. 2091.
Brock et al., "Recording Position Signals on Record Disks", IBM TDB, vol. 22, No. 8A, 1-1980, pp. 3127-3130.
Palmer et al., "Packwriter Write Correction System", IBM TDB, vol. 13, No. 11, 4-71, p. 3505.

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