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公开(公告)号：JPH11149649A
公开(公告)日：1999-06-02
申请号：JP22830698
申请日：1998-08-12
Applicant: CIRRUS LOGIC INC
Inventor： FEYH GERMAN S , SPINO LOUIS , PAUL ROMANO , LARRY KING
Abstract: PROBLEM TO BE SOLVED: To generate a position error signal independently of a frequency component of recorded data in a differential phase detector for an optical disk recording device. SOLUTION: One pair of diagonal signals S1 and S2 are generated by adding each quadrant A-D of a quadripartite detector. Phase offset among these diagonal signals indicate a position error of an image of a pit at a point of time at which a image of a pit passes through an optical detector. This position error is obtained by calculating a difference between positive correlation and negative correlation of diagonal signals S1 and S2 which are called as dual arm correlation(DAC). Then, Δ is correlation offset, L is correlation length. In a suitable actual mode, correlation of offset Δ is adjusted to be suitable so that correlation between S1 and S2 is made the maximum.
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