On-track detecting circuit for use in tracking servo apparatus

摘要

An on-track detecting apparatus which can accurately detect an on-track state of a disk even in a high speed search in an optical disk apparatus for recording or reproducing data to/from an optical disk having byte patterns of a sample servo. In an on-track detecting circuit in a tracking servo apparatus, a comparator for comparing a mean value of wobble pit signals and a clock pit signal is provided and an on-track signal is generated on the basis of a comparison result of the comparator.