Patent ID: 6700847
Filing Date: 2004-03-02
Classification: G11B

Abstract:
A recording and reproducing apparatus for recording and reproducing information in and from a disc-like recording medium including recording tracks each wobbled according to a predetermined frequency and information recording portions in which at least address information is recorded at a predetermined wobbling period interval, the recording and reproducing apparatus comprising:wobbling signal extracting means for extracting a wobbling signal from a reproduction output from the disc-like recording medium; reference clock generating means for generating a reference clock having a period shorter than the period of the wobbling signal; count means for binarizing the wobbling signal extracted by the wobbling signal extracting means to obtain a wobbling pulse and for counting and accumulating the number of pulses of the reference clock from the reference clock generating means for predetermined periods of the wobbling pulse to obtain a count value; dividing means for obtaining an average count value corresponding to an interval of an averaged period of the wobbling pulse by dividing the count value from the count means with the number of the predetermined periods; and wobbling pulse generating means for generating a wobbling pulse having a constant period as a recording and reproducing clock signal by dividing the reference clock based on the average count value.