Title:
DCレベル・シフトを含むサーボ・データの処理
Document Type and Number:
Japanese Patent JP5011429
Kind Code:
B2
Abstract:
A read channel component of a magnetic recording system employs equalization of a signal received from the magnetic recording channel, the equalization being modified depending upon the presence or absence of DC shifts in the signal. Equalization corrects for DC shifts, if present, prior to detection and decoding of servo data, such as servo address mark (SAM) and Gray code data. In a first implementation, a DC shift detector detects the presence or absence of DC shifts and modifies equalization in a predetermined manner. In a second implementation, filtering is applied to the signal to enhance equalization in the presence of DC shift, and both filtered and unfiltered signals employed for detection of the servo data.
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Inventors:
Pervez M. Azitsu
Application Number:
JP2010230323A
Publication Date:
August 29, 2012
Filing Date:
October 13, 2010
Export Citation:
Assignee:
Agia Systems Incorporated
International Classes:
G11B20/14; G11B5/09; G11B20/10; G11B20/18; G11B21/10; H04L25/06
Domestic Patent References:
| JP2000090605A | ||||
| JP2002324370A | ||||
| JP10340417A |
Attorney, Agent or Firm:
Okabe
Masao Okabe
Nobuaki Kato
Asahi Shinmitsu
Masao Okabe
Nobuaki Kato
Asahi Shinmitsu