Patent ID: 6418096
Filing Date: 2002-07-09
Classification: G11B

Abstract:
An apparatus for reading an optical data carrier (1), comprising:a transducer (5) for optically reading an optically readable pattern recorded in substantially parallel data tracks of the data carrier, and for generating a read signal (S0(t)) which is an indication of the optically readable pattern, means for causing a relative movement of the transducer (5) with respect to the data carrier (1), correction means (16, 17, 18) for reducing tangential tilt (IT), and error signal generating means (20) for generating an error signal (SE(t)) for the correction means, characterized in that the error signal generating means (20) is adapted to derive the error signal (SE(t)) from a temporal asymmetry of the response of the read signal (S0(t)) to the optically readable pattern.