| 摘要 |
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.
|
