Multilayer information medium, reproduction method and reproduction device thereof

A reproducing device of a multilayer recording medium comprising at least three information layers, comprising:

• a light source operable to irradiate a laser beam onto one information layer to read information recorded in the multilayer recording medium;
• a first detector operable to detect a reflected light from the one information layer mainly to generate an information signal;
• a second detector operable to detect a reflected light from the other information layers than the one information layer to generate a cross talk signal;
• a cross talk detector operable to read a cross talk information from a management area of the multilayer recording medium, the cross talk information indicating a ratio of the cross talk light leaking from the other information layers on the light source side to a reflected light from the one information layer;
• an amplifier operable to adjust a gain of the cross talk signal from the second detector based on the read cross talk information, and amplify the cross talk signal based on the gain;
• and
• a differentiating unit operable to obtain a difference between the information signal from the first detector and the cross talk signal amplified by the amplifier to generate a reproduction signal indicating information recorded in the one information layer.