Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1996-12-17
2000-02-29
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 51, 360 7708, G11B 509, G11B 5596
Patent
active
060316721
ABSTRACT:
Methods and apparatus are provided for detecting servo information in a direct access storage device. A plurality of data symbols are read from a disk to produce a readback signal. Each data symbol and each sequence of data symbols contains servo identification information. A correlation filter provides a matched filter function of an expected readback signal of the plurality of data symbols to produce a correlated readback signal. A threshold detector is coupled to the correlation filter for identifying a threshold signal representative of the data symbol. A data separator responsive to the threshold detector windows the threshold signal and provides clock and data signals. The data separator includes a digital variable frequency oscillator (VFO) which optimally centers incoming servo information from the disk in a timing window and provides standard clocked data for a servo processor. The threshold detector has a variable threshold voltage that is programmed using a trim digital-to-analog converter (DAC).
REFERENCES:
patent: 4808884 (1989-02-01), Hull et al.
patent: 4845575 (1989-07-01), Wahler
patent: 4897740 (1990-01-01), Suzuki
patent: 4908722 (1990-03-01), Sonobe
patent: 5047877 (1991-09-01), Herting
patent: 5068753 (1991-11-01), Kanegae
patent: 5121262 (1992-06-01), Squires et al.
patent: 5170297 (1992-12-01), Wahler et al.
patent: 5255131 (1993-10-01), Coker et al.
patent: 5321559 (1994-06-01), Nguyen
patent: 5343340 (1994-08-01), Boutaghou et al.
patent: 5359586 (1994-10-01), Izumi et al.
patent: 5362993 (1994-11-01), Aubry
patent: 5402274 (1995-03-01), Miyazawa et al.
patent: 5576906 (1996-11-01), Fisher et al.
patent: 5706222 (1998-01-01), Bonaccio et al.
United States Patent Application Serial No. 08/397,593, filed Mar. 2, 1995 entitled "Method and Apparatus for Servo Pulse Detection with High AC Coupling and Large Pulse Asymmetry".
Bergquist Mark Andrew
Coker Jonathan Darrel
Galbraith Richard Leo
Philpott Rick Allen
Stanek David James
International Business Machines - Corporation
Neal Regina Y.
Pennington Joan
Psitos Aristotelis M.
LandOfFree
Method and apparatus for servo data pattern detection 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 and apparatus for servo data pattern detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for servo data pattern detection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-688386