公开(公告)号：US20030081933A1

公开(公告)日：2003-05-01

申请号：US10102832

申请日：2002-03-22

申请人： FUJITSU LIMITED

发明人： Katsuhiko Fukuda ,  Toru Fujiwara ,  Akiyoshi Uchida

IPC分类号： H04N009/00

CPC分类号： G11B20/10148 ,  G11B20/10009 ,  G11B20/10055 ,  G11B20/10083 ,  G11B20/10101 ,  G11B20/10296 ,  H03M13/4107 ,  H03M13/6343 ,  H04N5/85

摘要： A data reproduction device in conformity to Viterbi decoding includes an inverted-selected path generation part for receiving a selected path and an inverted candidate, selecting and modifying the selected path corresponding to the inverted candidate so as to produce a inverted-selected path that is an inverted version of the selected path, and outputting a number of the inverted-selected paths in parallel, the number corresponding to a number of the inverted candidates selected for the selected path of a predetermined data length and a second candidate data generation part for generating second candidate data from the inverted candidate. The device further includes a data selection part for selecting between the first and the second candidate data based on error detecting results.

摘要翻译： 符合维特比解码的数据再现装置包括用于接收所选择的路径和反向候选的反向选择路径生成部，选择和修改与所述反向候选对应的所选择的路径，以产生作为 反转版本的所选路径，并且并行地输出多个反向选择的路径，对应于为预定数据长度的选定路径选择的反转候选数的数量和用于生成第二个的第二候选数据生成部分 来自倒排候选人的候选数据。 该装置还包括数据选择部分，用于基于检错结果在第一和第二候选数据之间进行选择。

公开(公告)号：US20030227851A1

公开(公告)日：2003-12-11

申请号：US10340752

申请日：2003-01-13

申请人： FUJITSU LIMITED

发明人： Satoshi Furuta ,  Katsuhiko Fukuda ,  Akihiro Itakura

IPC分类号： G11B007/005

CPC分类号： H03M13/3905 ,  G11B20/1833 ,  H03M13/2978 ,  H03M13/6561

摘要： An information recording and reproduction apparatus has a turbo decoder that decodes turbo encoded data. The turbo decoder has a number of likelihood ratio calculation units, forward direction path probability calculation units the number of which is less than the number of the likelihood ratio calculation units, and backward direction path probability calculation units the number of which is less than the number of the likelihood ratio calculation units. The likelihood ratio calculation units calculate in parallel the likelihood ratio for each of a plurality of data blocks. The forward direction path probability calculation units time-divisionally calculate probabilities of the forward direction paths for the data blocks. The backward direction path probability calculation units time-divisionally calculate probabilities of the backward direction paths for the data blocks.

摘要翻译： 信息记录和再现装置具有解码turbo编码数据的turbo解码器。 涡轮解码器具有多个似然比计算单元，其数目小于似然比计算单元的数量的前向路径概率计算单元，其数量小于该数目的后向路径概率计算单元 的似然比计算单位。 似然比计算单元并行地计算多个数据块中的每一个的似然比。 向前方向路径概率计算单元分时地计算数据块的前向路径的概率。 向后方向路径概率计算单元分时地计算数据块的反向路径的概率。

公开(公告)号：US20020181375A1

公开(公告)日：2002-12-05

申请号：US09957211

申请日：2001-09-20

申请人： FUJITSU LIMITED

发明人： Katsuhiko Fukuda ,  Kenichi Hamada ,  Masakazu Taguchi

IPC分类号： G11B007/00

CPC分类号： G11B20/1403 ,  G11B20/10009 ,  G11B20/10055 ,  G11B20/10083 ,  G11B20/10222 ,  G11B20/1025 ,  G11B20/10296 ,  G11B20/10425

摘要： A clock adjustment device for a data reproduction apparatus includes an edge detection part detecting an edge of a reproduced signal corresponding to a predetermined synchronization pattern based on a state of change of sampled values obtained in synchronism with a clock signal from the reproduced signal, a timing signal output part outputting a timing signal in a given cycle determined by the synchronization pattern from a timing at which the edge of the reproduced signal is detected, and a phase adjustment part adjusting a phase of the clock signal when the edge of the reproduced signal is detected and every time the timing signal is output.

摘要翻译： 用于数据再现装置的时钟调整装置包括边缘检测部分，其基于与来自再现信号的时钟信号同步获得的采样值的变化状态，检测与预定同步模式对应的再现信号的边沿，定时 信号输出部分，从检测出再现信号的边沿的定时输出由同步模式确定的给定周期中的定时信号;以及相位调整部分，当再现信号的边缘为 每次输出定时信号。