Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-03-01
1993-02-16
Smith, Jerry
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 46, 330284, 307493, 307264, G11B 5596, H03G 330
Patent
active
051876191
ABSTRACT:
An automatic gain control circuit for controlling amplification of two independent input signals in which first and second attenuators are connected to receive the input signals and each attenuator is selectively switchable to vary its output between maximum and minimum attenuations such that the sum of the outputs of the attenuators are held at a substantially constant reference level. The circuit is used in a disk drive with a data surface comprising circular data tracks divided into sectors each of which includes a data field and a servo field containing embedded servo signals, an embedded signal sensor for sensing embedded servo signals on a data surface and a head positioning system for positioning a read/write head over a selected data track. The servo fields in the data tracks contain first and second embedded servo signals of substantially equal amplitude offset relative to each other and disposed on alternate sides of the track centerlines. The sensed signals corresponding to the first and second embedded servo signals are sampled, amplified using the automatic gain control circuitry and compared to provide a track error signal for positioning the read/write head over a selected data track.
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: 4276604 (1981-06-01), Kitamura 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 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. 1876, 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".
Digital Equipment Corporation
Garland Steven R.
Smith Jerry
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