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:
Oct. 20, 2009
Filed:
May. 28, 2004
Atsushi Kikuchi, Kanagawa, JP;
Masayuki Hattori, Kanagawa, JP;
Toshiyuki Miyauchi, Tokyo, JP;
Kazuo Watanabe, Tokyo, JP;
Makiko Kan, Tokyo, JP;
Atsushi Kikuchi, Kanagawa, JP;
Masayuki Hattori, Kanagawa, JP;
Toshiyuki Miyauchi, Tokyo, JP;
Kazuo Watanabe, Tokyo, JP;
Makiko Kan, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
The present invention relates to a decoding method and a decoder, a program, a recording-and-reproducing apparatus and a method, and a reproducing apparatus and a method that are suitable for decoding encoded data encoded by using a linear code on ring R. A low-density processing unit performs parity-check-matrix low-density processing, performs linear combination for rows of a parity check matrix included in an obtained reception word, and generates a parity check matrix according to the linear-combination result, thereby reducing the density of the parity check matrix used for decoding, at step S. Then, at step S, an LDPC decoding unit performs decoding by using a sum product algorithm (SPA) by using the parity check matrix whose density is reduced through the processing performed at step S. Where the processing at step Sis finished, the LDPC decoding unit finishes decoding for the reception word. The present invention can be used for an error-correction system.