A clock signal generating system using a wobble signal and a data reproducing
apparatus,
has a first block to detect a frequency error signal or a phase error signal from
the RF signals on the recording medium and to output the detected frequency error
signal or the detected phase error signal. A second block detects a wobble error
signal from the wobble signals on the recording medium and outputs the detected
wobble error signal. A clock generating unit generates a clock signal using the
detected frequency error signal or the detected phase error signal of the second
block when the RF signals have an error, and using the detected wobble error signal
of the first block when the wobble signals have an error.
