Optical medium reproduction apparatus and method of reproducing optical medium

An optical medium reproduction apparatus for optically reproducing an optical medium where a plurality of tracks are formed, comprising:

• a detection unit for splitting a cross section of a beam, after the beam is irradiated onto the optical medium and is returned to the detection unit from the optical medium, into a plurality of regions in a tangential direction, wherein the returned beam includes mixed information of three tracks which is reproduced simultaneously by one beam, and for forming respective detection signals of the plurality of the regions;
• and
• a data detection processing unit configured to process the respective detection signals obtained by splitting the beam and input from the detection unit, to provide binary data in which adjacent track cross talk is cancelled using only an output read from a track to be reproduced, the data detection processing unit comprising:
• a multiple input adaptive equalizer having a plurality of adaptive equalizer units, wherein the respective detection signals of the plurality of the regions are inputted into the plurality of adaptive equalizer units, and the outputs of the plurality of adaptive equalizer units are computed to form equalization signals;
• a binarization unit for binarizing the equalization signals to provide the binary data in which adjacent track cross talk is cancelled;
• and
• an equalization error computing unit for determining an equalization error from equalization target signals provided based on the binary data from the binarization unit and the equalization signals outputted from the multiple input adaptive equalizer, and providing the adaptive equalizer units with the equalization error as control signals for adaptive equalization,
• the plurality of the regions formed by splitting being four or more.