Optical information reproducing apparatus and optical information reproducing method

摘要

In reproduction of a two-dimensional page data from an optical information recording medium utilizing holography, a reproduced two-dimensional page data is divided into a plurality of areas each of which has a predetermined size, the divided two-dimensional areas are individually subjected to adaptive equalizing, and then are coupled to restore the condition of the original two-dimensional page data.

主权项

1. An optical information reproducing apparatus for reproducing information utilizing holography, comprising:
a pickup configured to reproduce a two-dimensional signal from an optical information recording medium; a divider configured to divide a page, represented by the two-dimensional signal reproduced from the pickup, into a set of at least two areas, represented by divided two-dimensional signals; a filter coefficient operating circuit configured to calculate a filter coefficient for each set of divided two-dimensional signals which has been divided by the divider, such that an error between a set of equalized divided two-dimensional signals and ideal signals is minimized, the set of equalized divided two-dimensional signals and ideal signals corresponding to the set of divided two-dimensional signal; a filter circuit configured to filter each set of the divided two-dimensional signals, by using the filter coefficient output from the filter coefficient operating circuit; a coupler configured to couple a set of equalized two-dimensional signals output from the filter circuit; and a binarizing circuit configured to binarize a coupled two-dimensional signal output from the coupler.