| US 7,403,463 B2 | ||
| Method and apparatus for filtering read signal to three or more cutoff frequencies with two or more bits control line throughout three or more consecutive periods | ||
| Hideyuki Yamakawa, Kawasaki (Japan); Toshihiko Kaneshige, Yokohama (Japan); and You Yoshioka, Yokohama (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Dec. 16, 2004, as Appl. No. 11/12,855. | ||
| Claims priority of application No. 2003-435026 (JP), filed on Dec. 26, 2003. | ||
| Prior Publication US 2005/0141370 A1, Jun. 30, 2005 | ||
| Int. Cl. G11B 7/005 (2006.01); G11B 7/007 (2006.01); G11B 20/10 (2006.01) | ||
| U.S. Cl. 369—100 [369/53.11] | 8 Claims |
| 1. An optical disk drive apparatus comprising:
a reading section which reads the reflection of a laser beam from a disk to produce a read signal;
a filter section which filters the read signal with the use of three or more different cutoff frequencies upon receiving a
control signal from a two or more bits signal line;
a reproducing section which playbacks the read signal filtered by the filter; and
a control section which provides the filter with the control signal along the two or more bits control line so that the filtering
action with the three or more different cutoff frequencies of the filter is carried out throughout three or more consecutive
periods respectively.
|