| 摘要 |
PROBLEM TO BE SOLVED: To reduce reproduction errors caused by waveform distortion by reducing a level jitter due to the influence of the waveform distortion of a reproducing signal in magnetic domain magnification type magnetooptical recording reproduction. SOLUTION: In the magnetic domain magnification type magnetooptical recording reproduction, in the case that a waveform is sampled to perform digital PR equalization, a prescribed mark length is detected with a mark length temporary determination circuit 10, and sampling calculation of PR(α-1)(α≠1) is performed between prescribed mark length edges. In the case of sapling after PR(1, -1) equalization, a prescribed value is added to or subtracted from a sampled value only between the prescribed mark length edges with a sampling correction circuit 11. Therefore, in the case that three value detection of PR(1, -1) is performed, the level jitter is reduced to enhance improvement effect of errors during Viterbi decoding. COPYRIGHT: (C)2004,JPO&NCIPI
|
