The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 2005
Filed:
Jun. 25, 2001
Naoya Kobayashi, Odawara, JP;
Seiichi Mita, Kanagawa-ken, JP;
Masaharu Kondo, Odawara, JP;
Hideki Sawaguchi, San Diego, CA (US);
Takashi Moriyasu, Kokubunji, JP;
Naoya Kobayashi, Odawara, JP;
Seiichi Mita, Kanagawa-ken, JP;
Masaharu Kondo, Odawara, JP;
Hideki Sawaguchi, San Diego, CA (US);
Takashi Moriyasu, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A digital magnetic recording/reproducing apparatus includes an LVA (List Viterbi Algorithm) detector which produces first to nth best sequences (n>1) of a decoded result, and replaces a likelihood ratio and a path memory of the ith best sequence (i=2, 3, . . . , n) with those of the (2i−1)th best sequence when contents of path memories of the (i−1)th and ith best sequences are equal to each other and an absolute value of a difference between likelihood ratios of the (i−1)th and (2i−1)th best sequences is smaller than a decision threshold. Alternatively, the LVA detector initializes a likelihood ratio of the ith best sequence to be a likelihood ratio of the (i−1)th best sequence with a constant difference value added thereto when contents of path memories of the (i−1)th and ith best sequences are equal to each other.