Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-01-02
2007-01-02
Korzuch, William (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053280
Reexamination Certificate
active
10339376
ABSTRACT:
Servo error signal circuitry apparatus and methods are described. The difference between two bottom envelope signals SEbtm and SFbtm is calculated by a subtracter (40) to generate a difference signal (SEbtm−SFbtm). The difference signal (SEbtm−SFbtm) is input as an alignment signal (AL) to an equalizer (42) and as a basic tracking error signal to the positive input terminal of a second subtracter (52). On the other hand, the difference between two top envelope signals SEtop and SFtop is calculated by a third subtracter (48) to generate a difference signal (SEtop−SFtop). The signal K(SEtop−SFtop) obtained by multiplying a coefficient K with the difference signal using a coefficient multiplier (50) is input to the negative input terminal of the second subtracter (52). The difference signal {(SEbtm−SFbtm)−K(SEtop−SFtop)} output from the second subtracter (52) is used as an offset corrected tracking error signal.
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Aoe Takashi
Murata Hironobu
Yamanoi Koyu
Battaglia Michael V.
Brady W. James
Korzuch William
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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