Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-11-27
2007-11-27
Dinh, Tan Xuan (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044350, C369S044410
Reexamination Certificate
active
10738098
ABSTRACT:
A track error detection device that removes a phase offset and a phase offset removing method thereof removes an error signal generated by device circuit errors. The device includes an equalizing unit for equalizing the inputted signals A, B, C and D at a level, a comparison unit for quantizing the equalized signals A, B, C and D, and a phase shifting unit for removing phase offsets among the quantized signals A, B, C and D, based on control signals. A system control unit provides the control signals to the phase shifting unit. The track error detection device can remove all types of phase offsets which occur in the track error detection device. The accuracy and reliability of the detected track error signal is thus improved. By adjusting the phases of the quantized signals in the process of removing the phase offsets, power consumption and size of hardware is reduced.
REFERENCES:
patent: 6028826 (2000-02-01), Yamamoto et al.
patent: 2002/0094024 (2002-07-01), Ma et al.
patent: 60-43917 (1985-03-01), None
patent: 10-97725 (1998-04-01), None
patent: 11-110766 (1999-04-01), None
Chang Soo-jung
Lee Jeong-won
Lee Jung-eun
Dinh Tan Xuan
Haley Joseph
Sughrue Mion Pllc.
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