Optical disc apparatus

Abstract

There are provided a balance adjustment circuit () for adjusting levels of first and second detection signals from a tracking detector, a differential circuit () for generating a difference signal between the adjusted first and second detection signals, an AD conversion circuit () for digitizing the difference signal, a wobble signal detection circuit () for detecting a wobble signal from the digitized difference signal, an adder circuit () for generating a sum signal of the adjusted first and second detection signals, a binarization circuit () for converting the sum signal into a binarized signal, a latch circuit () for latching the binarized signal and converting the same into a timing signal, a control signal generation circuit () for generating a control signal based on the timing signal and the digitized difference signal, a residual component removal circuit () 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 () for detecting address information from the LPP detection signal. The wobble signal and the LPP signal are detected reliably with a simple configuration.