Patent ID: 7012862
Filing Date: 2006-03-14
Classification: G11B

Abstract:
1. A tracking error detection apparatus comprising: a phase error detection unit operable to detect a phase error of an output signal according to an amount of reflected light that is obtained when a light beam is applied to an information recording medium; a low-band pass filter unit operable to perform band restriction to obtain a tracking error signal from a phase error signal of the phase error detection unit; a clock generation unit operable to generate a clock and a clock control unit having a first frequency division unit operable to generate a frequency-divided clock from the clock that is generated by the clock generation unit, a first clock switching unit operable to select either the clock that is generated by the clock generation unit or the frequency-divided clock, as a clock for phase error detection which is to be supplied to the phase error detection unit a second frequency division unit operable to generate a frequency-divided clock from the clock for phase error detection, and a second clock switching unit operable to select either the clock for phase error detection or the frequency-divided clock generated from the clock for phase error detection, as a clock for low-band pass filter unit which is to be supplied to the low-band pass filter unit.