Masatoshi Ohtake

Number Of Sectors And Track Offset Suppression Performance In The Composite Wobbled Tracking Optical Disk

The new tracking method named composite method is analyzed both theoretically and experimentally. It is found that this type of disk realizes high optical stability and accurate track following, which is not influenced by optical head characteristics. The composite method, a conbination of the push-pull and the wobbled tracking method, has the number of wobbled sectors in the order of 16-32. In this method, the wobbled tracking technique is used to suppress the low frequency offset component in the push-pull tracking error signal due to aging or soiling of the optical system. The relation between the number of sectors, track offset suppression performance and influence of missampling were simulated by servo simulator; the results were found to be quite consistent with the experimental results.