Method and apparatus for servo pulse detection with high AC coup

Details Method and apparatus for servo pulse detection with high AC coup Method and apparatus for servo pulse detection with high AC coup

1997-06-05

1998-09-01

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, 360 51, G11B 5596

Patent

active

058018964

ABSTRACT:
Track information decoding circuitry of a data storage device servo control system decodes binary track information in a readback servo signal by detecting opposite polarity track information pulse pairs so as to produce a track information signal "one" bit if the presence of an opposite polarity pulse pair is detected and produce a track information signal "zero" bit in the absence of an opposite polarity pulse pair, wherein a one bit is produced only if there has been detected a second pulse of a readback signal pulse pair having a magnitude greater than a predetermined threshold value and having a correct polarity. The polarity of the last di-bit of the servo signal AGC field can be used to set the polarity in the pulse qualification process. Alternatively, a pulse detecting circuit at disk start-up decodes the readback signal first assuming a positive leading di-bit pulse and then assuming a negative leading di-bit pulse, determines the number of errors associated with each assumption, and selects the di-bit pulse polarity for further decoding that produced the decoded information having fewer errors.

REFERENCES:
patent: 4516162 (1985-05-01), West
patent: 4783705 (1988-11-01), Moon et al.
patent: 4823212 (1989-04-01), Knowles et al.
patent: 5041926 (1991-08-01), Ockerse et al.
patent: 5357378 (1994-10-01), Urakawa
patent: 5477103 (1995-12-01), Romano et al.

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