Information recording and reproducing apparatus and method,...

Details Information recording and reproducing apparatus and method,... Information recording and reproducing apparatus and method,...

2006-05-30

2006-05-30

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

C360S039000

Reexamination Certificate

active

07054088

ABSTRACT:
A timing recovery unit detects a phase offset and a frequency offset from a head area of reproduction data and initially corrects them. The timing recovery unit stores data in which a head reproduction signal has been made to be discrete by a fixed clock into a buffer. A phase offset detector detects the phase offset from the data head area in parallel with the operation for writing the data into the buffer. At the same time, a frequency offset detector detects the frequency offset from the data head area in parallel with the operation for writing the data into the buffer. A correction value of the detected phase offset and a correction value of the detected frequency offset are initially set into a digital PLL. While the data is read out from the buffer, a frequency lead-in and a phase lead-in are executed in the head area.

REFERENCES:
patent: 5572558 (1996-11-01), Beherns
patent: 5754352 (1998-05-01), Behrens et al.
patent: 5917668 (1999-06-01), Behrens et al.
patent: 6285219 (2001-09-01), Pauls
patent: 6542039 (2003-04-01), Ogura

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