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:
Jun. 29, 1999
Filed:
Oct. 10, 1995
Kaneyasu Shimoda, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A maximum likelihood detection of a convolution code Yn obtained by coupling a transversal equalizer to a code Zn of a recording and reproducing channel. A branch metric is arithmetically operated by changing a weight of a data train of a convolution code corresponding to multiplication coefficients of a filter by a distributor with respect to a reproduction signal Rn. On the basis of the branch metric, an ACS circuit judges a maximum likelihood path at every path node and the results are stored into a path memory 56. Simultaneously with the maximum likelihood detection, metrics of the maximum likelihood paths judged with respect to the path nodes are compared by a maximum likelihood path comparing circuit, thereby deciding the maximum likelihood path node. A maximum inclination arithmetic operating circuit calculates a maximum inclination of the multiplication coefficients of the filter. The next multiplication coefficients are updated by an updating circuit.