Apparatus for generating a data signal at an optimal phase

DETAILED DESCRIPTION It is an object of this invention to provide an improved data detecting apparatus for an optical disk.
In a data detecting system for an optical disk having regions in which sync signals are recorded, the system comprising a sample circuit which samples a reproduced signal at a timing determined by a data detecting signal, an apparatus of this invention comprises means for sampling a reproduced waveform of each sync signal at a first time point and generating a first sample value representative thereof; means for sampling the reproduced waveform of each sync signal at a second time point different from the first time point and generating a second sample value representative thereof; means for comparing the first and second sample values and generating a comparison signal representing a result of said comparing; and means for controlling a phase of the data detecting signal in response to the comparison signal.