Method of automatic gain control basis selection and method of h

Details Method of automatic gain control basis selection and method of h Method of automatic gain control basis selection and method of h

1991-03-07

1992-03-24

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 7708, 360 67, G11B 5596, G11B 502

Patent

active

050993674

ABSTRACT:
A magnetic disk drive wherein the radial position of a sensing head being positioned by a servo system is ascertained from the sensing of servo signals arranged in successive groups of tracks on a disk surface, each of the tracks in a group being of a different track type and said servo signals being in relative circumferential positions according to the track types of the tracks containing those signals. The sensed servo signals are linearly related to the radial position of the head relative to the track containing the corresponding servo signal, the linear relationship extending over a radial distance of a plurality of tracks, are amplified by a gain controlled amplifier, and are gated to respective detectors corresponding to different track types. The amplifier is controlled by a gain error signal derived from comparison of the sum of the outputs of the detectors to a reference level. Combinations of the detector signals are used to position a read/write head corresponding to the sensing head over selected tracks or radial positions between tracks. The dedicated servo surface is also used for control purposes during servo writing on the data surfaces and to generate a Gray code for track identification.

REFERENCES:
patent: 3534344 (1970-10-01), Santana
patent: 3691543 (1972-09-01), Mueller
patent: 3818502 (1974-06-01), Chien et al.
patent: 3893180 (1975-07-01), Braun et al.
patent: 3994016 (1976-11-01), Moghadam
patent: 4027338 (1977-05-01), Kril
patent: 4048660 (1977-09-01), Dennison et al.
patent: 4052741 (1977-10-01), Baca et al.
patent: 4072990 (1978-02-01), Case et al.
patent: 4101942 (1978-07-01), Jacques
patent: 4115823 (1978-09-01), Commander et al.
patent: 4149200 (1979-04-01), Card
patent: 4172267 (1979-10-01), Sidman
patent: 4238809 (1980-12-01), Fujiki et al.
patent: 4297737 (1981-10-01), Andresen et al.
patent: 4326226 (1982-04-01), Touchton et al.
patent: 4377827 (1983-03-01), Rose
patent: 4424543 (1984-01-01), Lewis et al.
IBM TDB, vol. 20, No. 1, "Off-Track Gain Calibration of Position Error Signal", Palmer, 6/77, pp. 349-350.
IBM Tech. Disc. Bull., vol. 18, No. 10, Mar. 1976, pp. 3424-3425, Oswald, "Track Following Servo System".
IBM Tech. Disc. Bull., vol. 19, No. 7, Dec. 1976, pp. 2686-2687, Brownback et al., "Measuring and Adjusting Speed of Magnetic Disk Access Arm".
IBM Tech. Disc. Bull., vol. 20, No. 8, Jan. 1978, pp. 3243-3247, Deremer et al., "Sector Servo Method".
IBM Tech. Disc. Bull., vol. 21, No. 2, Jul. 1978, pp. 804-805, Herrington et al., "Quad-Burst PES System for Disk File Servo".

Affiliated with

Also associated with

Rating

Method of automatic gain control basis selection and method of h does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of automatic gain control basis selection and method of h, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of automatic gain control basis selection and method of h will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2014925