Tracking-servo-system controller in an optical-disk player

Details Tracking-servo-system controller in an optical-disk player Tracking-servo-system controller in an optical-disk player

G - Physics

11

B

G11B 7/09 (2006.01)

Patent

CA 2096552

ABSTRACT OF THE DISCLOSURE A tracking-servo-system controller in an optical-disk player according to the present invention uses a high-pass filter to extract from a readout signal an alternating-current component which is not affected by variations in the reflectance of a disk, and produces a control signal for initiating a pull-in operation of the tracking servo system based on the alternating-current component. Firstly, a comparator detects a zero crossing of the alternating-current component. Secondly, a pulse generator produces a pulse on the zero crossing. Thirdly, a D flip-flop is activated by the pulse. An output of the D flip-flop is sent as the servo control signal to the tracking servo system. The tracking servo system starts the pull-in operation on the zero crossing of the alternating-current component. It is thus possible to achieve a stable servo irrespective of variations in the reflectance of the disk.

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