Optical disc apparatus

Details Optical disc apparatus Optical disc apparatus

2007-02-13

2007-02-13

Edun, Muhammad (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044270, C369S059210, C369S059170

Reexamination Certificate

active

10567418

ABSTRACT:
There are provided a balance adjustment circuit (6) for adjusting levels of first and second detection signals from a tracking detector, a differential circuit (8) for generating a difference signal between the adjusted first and second detection signals, an AD conversion circuit (10) for digitizing the difference signal, a wobble signal detection circuit (14) for detecting a wobble signal from the digitized difference signal, an adder circuit (30) for generating a sum signal of the adjusted first and second detection signals, a binarization circuit (32) for converting the sum signal into a binarized signal, a latch circuit (33) for latching the binarized signal and converting the same into a timing signal, a control signal generation circuit (34) for generating a control signal based on the timing signal and the digitized difference signal, a residual component removal circuit (18) for removing a residual signal component included in the digitized difference signal based on the control signal and outputting a LPP detection signal, and an address detection circuit (21) for detecting address information from the LPP detection signal. The wobble signal and the LPP signal are detected reliably with a simple configuration.

REFERENCES:
patent: 5339302 (1994-08-01), Takahashi et al.
patent: 6744706 (2004-06-01), Miyagawa et al.
patent: 6912190 (2005-06-01), Inokuchi et al.
patent: 2002/0176340 (2002-11-01), Yamamoto et al.
patent: 2003/0165095 (2003-09-01), Iimura et al.
patent: 2002-074675 (2002-03-01), None
patent: 2002-216363 (2002-08-01), None

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