Patent ID: 6940805
Filing Date: 2005-09-06
Classification: G11B

Abstract:
1. Apparatus for simultaneously reading multiple adjacent tracks of an optical disk, the apparatus comprising: optical devices for generating a plurality of reading beams including a center beam; an optical system disposed in a path of the plurality of reading beams, the optical system directing the plurality of reading beams onto a surface of the optical disk; a plurality of split photodetector elements including a center element and a plurality of side elements, the center element generating an output signal corresponding to the center beam, at least one of the plurality of side elements generating an output signal for a corresponding one of the plurality of reading beams; and a cross-talk cancellation apparatus that determines the track offset of the optical disk, that verifies if the track offset is below or above a threshold value, wherein the threshold value is a function of the track pitch of the optical disk, and that applies cross-talk cancellation to correct cross-talk and jitter for the output signal of at least one of the side elements according to the track offset.