Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-07-16
1986-10-07
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 556
Patent
active
046162763
ABSTRACT:
An improvement to a disk file servo control system removes repeatable error from the read/write head position error signal (PES) during track following. The disk file includes a microprocessor 60 and associated memory devices 62, 64. A table of values of a sine function having a frequency equal to the disk rotational frequency is stored in a memory device. The microprocessor 60 receives each sample of PES from the servo control system and values from the sine function table in the memory device and computes a group of tap weights, each tap weight being a function of the PES sample, the value of a sine or cosine function with a frequency at one of the harmonics of the disk rotational frequency, a learning rate factor and the corresponding value of the tap weight for the previous PES sample. For each PES sample, the tap weights in a group are added to generate a repeatable error correction signal U.sub.c which is summed with the control signal U to the head actuator, thereby generating a modified control signal U.sub.m which causes the head to follow the true track centerline. The repeatable error components are thus removed from the PES.
REFERENCES:
patent: 3881184 (1975-04-01), Koepcke et al.
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4412161 (1983-10-01), Cornaby
"Design of a Disk File Heat-Positioning Servo", IBM J. Res. Develop., Nov. 1974, pp. 506-512, R. K. Oswald.
"Track-Locating and -Following Apparatus for a Flexible Disk File", IBM Technical Disclosure Bulletin, vol. 23, No. 2, Jul. 1980, pp. 738-742, R. C. Jahnke.
"Self-Calibrating Disk Storage Apparatus", IBM Technical Disclosure Bulletin, vol. 19, No. 6, Nov. 1976, pp. 1991-1992, Griffiths et al.
"Disk Runout Accommodation", IBM Technical Disclosure Bulletin, vol. 21, No. 7, Dec. 1978, pp. 2688-2691, J. P. Mantey.
"Adaptive Filters", Aspects of Network and System Theory, by Bernard Widrow, pp. 563-587, Holt, Rinehart and Winston, Inc. N.Y., 1970.
Berthold Thomas R.
International Business Machines - Corporation
Stellar George G.
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