Patent ID: 6198711
Filing Date: 2001-03-06
Classification: G11B

Abstract:
An optical reproducing apparatus comprising:laser emitting means for emitting laser light to an optical recording medium;movement means for moving the laser light along a track of said optical recording medium;light receiving means having a plurality of light receiving areas which are each divided by a line perpendicular to a direction of the track, each of said light receiving areas receiving the laser light reflected by said optical recording medium and outputting an electrical signal at a level in accordance with a quantity of the laser light;calculation means for calculating the electrical signal from each of said plurality of light receiving areas based on a predetermined mathematical expression and outputting the calculated signal as a reproducing signal in which spatial frequency characteristics are corrected, wherein said predetermined mathematical expression approximates a frequency characteristic of a partial response method; anddecoding means for decoding, without having performed an electrical equalizing operation, an information signal in accordance with a partial response method based on the reproducing signal output from said calculation means.