Patent ID: 6356523
Filing Date: 2002-03-12
Classification: G11B

Abstract:
An apparatus for reproducing information recorded on an optical disc comprising:a spindle motor for rotating an optical disc; reading means for optically reading a recorded signal on said optical disc to generate a read signal corresponding to said recorded signal; digital converting means for digitizing said read signal to reproduce an encoded signal; a spindle error signal generator for generating a spindle error signal representing deviation in phase of a phase component contained in said encoded signal from a reference clock pulse signal; a servo circuit for generating a speed control signal for the rotational speed control of said spindle motor in response to said spindle error signal; a drive circuit for generating a driving power discontinuously changing in magnitude with said speed control signal; and a high cut filter for removing from said driving power high frequency components which are caused by the discontinuous changes in level from higher to lower or vice versa thereof and for supplying the resultant driving power to said spindle motor, wherein said high frequency components include audible frequencies.