Optical medium reproducing device and optical medium reproducing method

An optical medium reproducing device configured to optically reproduce an optical medium including a plurality of tracks, the optical medium reproducing device comprising:

• a light source configured to emit a laser beam;
• an objective lens configured to irradiate the optical medium with the laser beam;
• an optical filter configured to receive an incident returned light beam from the optical medium, and to spatially and optically divide the incident returned light beam into a plurality of regions including a plurality of first signals having different bands in a linear density direction and a track density direction with parting lines extending in a tangential direction and a radial direction;
• an arithmetic unit configured to operate the plurality of first signals formed by the optical filter so as to form a plurality of channels of second signals;
• and
• an electrical filter configured to individually receive the second signals, and to perform processing to the second signals so as to acquire a reproduced signal,
• wherein the electrical filter has a filter characteristic including different amplitude-frequency characteristics and/or phase-frequency characteristics individually with respect to the plurality of signals individually generated in response to the regions separated by the optical filter.