Patent ID: 7920445

Claim:
An optical disc signal processing apparatus including a binarizing circuit configured to compare a level of a reference signal and a level of an RF (Radio Frequency) signal which is obtained by photoelectrically converting a reflected light of a laser beam applied to the optical disc and on which a first DC signal is superimposed, to output a binarized signal for reproducing information recorded on an optical disc, the optical disc signal processing apparatus comprising: a detecting circuit configured to detect jitter when a level of the DC signal is adjusted to a plurality of different levels, the jitter being fluctuation of the binarized signal on a time axis relative to a reproduction clock generated to be phase-locked to the binarized signal, the detecting circuit configured to charge and discharge a capacitor according to a phase difference between the binarized signal and the reproduction clock and to output a voltage on the capacitor as a first analog signal having a level corresponding to a magnitude of the jitter; an AD converter configured to analog-digital convert the first analog signal and output a first digital signal; a discriminating circuit configured to output a second digital signal for adjusting a level of the DC signal to the plurality of different levels within a certain range of levels when the first digital signal is input to the discriminating circuit, so as to discriminate the first digital signal for allowing the jitter to be minimized; and a DA converter configured to digital-analog convert the second digital signal and output a second analog signal, the binarizing circuit having a level of the DC signal set thereto according to the second analog signal corresponding to the first digital signal for allowing the jitter to be minimized.