Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-08-23
2005-08-23
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
06934110
ABSTRACT:
An apparatus and method generate an adaptive track zero crossing signal in a disc drive. An adder adds and outputs a predetermined signal to generate a track zero crossing signal and a correction signal. A comparator having a first input node and a second input node, receives the predetermined signal from the adder through the first input node, receives a reference voltage signal through the second input node, compares the signals input into the first and second input nodes, and generates a track zero crossing signal having a square wave. An offset correction calculator measures lengths of high and low sections of the track zero crossing signal, calculates a ratio of differences in the lengths between the high and low sections, and generates a correction signal to maintain a duty ratio of the track zero crossing signal at a predetermined target value using the calculated ratio.
REFERENCES:
patent: 5289447 (1994-02-01), Kobayashi et al.
patent: 5327408 (1994-07-01), Belser
patent: 5768229 (1998-06-01), Ikeda
patent: 5970032 (1999-10-01), Ikeda et al.
Hudspeth David
Wong K.
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