Asynchronous servo identification/address mark detection for PRM

Details Asynchronous servo identification/address mark detection for PRM Asynchronous servo identification/address mark detection for PRM

1992-08-13

1993-10-19

Shepperd, John

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

360 7708, G11B 509

Patent

active

052551318

ABSTRACT:
Apparatus and method for asynchronous servo identification (SID)/address mark detection are provided for data detection in a partial-response maximum-likelihood (PRML) data channel. The SID/AM pattern includes a first preamble section defined by a plurality of short magnets; a body section defined by a predetermined number of long magnets; and a delimiter section defined by a plurality of short magnets. Samples from the digital filter are applied to first and second correlation filtering paths. The first correlation filtering path includes a polarity threshold function to indicate one of a preamble section or a delimiter section of a SID/AM pattern. The second correlation filtering paths includes a second threshold function and a comparator for sequentially comparing sequential ones of the received samples responsive to identifying the second threshold value to identify a predefined sequence. A count value is incremented responsive to each the identified predefined sequence to indicate a body section of the SID/AM pattern.

REFERENCES:
patent: 4345280 (1982-08-01), Blagosila et al.
patent: 4631606 (1986-12-01), Sugaya
patent: 4786890 (1988-11-01), Marcus et al.
patent: 5073834 (1991-12-01), Best et al.

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