Patent ID: 7154832

Claim:
A reproduction apparatus for judging a type of an optical disc to reproduce information recorded on tracks of the optical disc, the optical disc being classified as a type of read-only optical discs whose tracks are formed with pits or as a type of recordable optical discs whose tracks are formed with wobbling grooves, the reproduction apparatus comprising: a motor adapted to rotate the optical disc; an optical head operable to irradiate the tracks of the optical disc rotated by said motor with an optical beam, the optical head including two light receiving elements positioned in a radial direction of the optical disc to receive a reflected light of the optical beam from the optical disc and output two detection signals corresponding to the reflected light; a push-pull signal generator operable to generate a push-pull signal from the two detection signals; a band pass filter operable to extract a wobbling signal indicative of wobbling components of the wobbling grooves from the push-pull signal; and a controller operable to judge the type of the optical disc based on whether or not a period of the wobbling signal changes with varying a rotating speed of said motor.