Patent ID: 7075868
Filing Date: 2006-07-11
Classification: G11B

Abstract:
1. A recording clock generating apparatus which produces a recording clock signal for recording data onto an optical disk, the optical disk having tracks of wobble grooves formed according to a wobble signal indicative of a predetermined frequency, and prepits formed with a given phase relation to the wobble signal, the recording clock generating apparatus comprising: a wobble signal sampler sampling the wobble signal from a signal obtained from the optical disk; a prepit signal detector detecting the prepits from the signal obtained from the optical disk, and outputting a prepit signal indicative of preformat information of the disk; a PLL circuit including an oscillator which outputs the recording clock signal synchronized with the wobble signal, at a frequency according to a voltage of an input signal of the oscillator; a phase comparator outputting a phase-difference signal based on a phase difference between the prepit signal and a clock signal derived from the recording clock signal; and an integrator outputting a signal indicative of an integration of the phase-difference signal output from the phase comparator.