Patent ID: 7324249
Filing Date: 2008-01-29
Classification: G11B,G11C

Abstract:
1. A recording and reproducing apparatus having a fixed distortion correcting function, comprising: a reproduction signal detection unit reproducing either a two-dimensional pattern previously recorded on a holographic recording medium or user data recorded on the holographic recording medium; a reference pattern storage unit previously storing a reference pattern to be provided when the two-dimensional pattern is reproduced; a correction information generation unit comparing a reproduction reference pattern signal corresponding to the two-dimensional pattern reproduced by the reproduction signal detection unit with the reference pattern stored in the reference pattern storage unit, and removing fixed distortion contained in the reproduction reference pattern signal to generate correction information used for reproducing the reference pattern from the reproduction reference pattern signal; a correction information storage unit storing the generated correction information; and a distortion correction unit performing a correction calculation, for a reproduction data signal of the user data reproduced by the reproduction signal detection unit, using the stored correction information to generate corrected reproduction data from which the fixed distortion contained in the user data is removed.