Sample data position error signal detection for digital sector s

Details Sample data position error signal detection for digital sector s Sample data position error signal detection for digital sector s

1993-01-04

1994-04-05

Smith, Jerry

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, G11B 558

Patent

active

053010728

ABSTRACT:
A sample data position error signal detection means is described. This invention is suited for use in a digital sector servo in a magnetic media disk drive environment. In particular, the invention relates to the detection and presentation in digital form of position error signals (PES) representative of magnitude and sign of recording head displacement from a track centerline. The circuits disclosed provide a digital representation of PES suitable for direct application to a digital signal processor which controls overall servo positioning operations. The invention detects the PES by an integration method and incorporates the innovation of requiring only two integrators to demodulate a PES having an arbitrarily large number of phases. The invention uses a phaselock oscillator having a hybrid digital/analog phase detector to generate the coherent carrier sequence for synchronous detection of PES. A further innovation of the invention is the use of a fully digital automatic gain control circuit (AGC). Prior embodiments of position demodulators have employed analog AGC approaches which are more sensitive to disk surface flaws and which cannot easily be made adaptive. Furthermore, such features as exponentiation of AGC gain control level can be readily incorporated with no penalty to circuit complexity.

REFERENCES:
patent: 3977000 (1976-08-01), Wagner
patent: 4130844 (1978-12-01), Klinger
patent: 4361857 (1982-11-01), Sakamoto
patent: 4550351 (1985-10-01), Hamalainen
IBM Publication GA 26-1665-0, IBM Disk Storage Technology Commander and Taylor, Feb. 1980, pp. 90-98.

Affiliated with

Also associated with

Rating

Sample data position error signal detection for digital sector s does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sample data position error signal detection for digital sector s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sample data position error signal detection for digital sector s will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-516459