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:
Feb. 02, 2021
Filed:
Feb. 28, 2020
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Electronic Devices & Storage Corporation, Tokyo, JP;
Manabu Kobayashi, Kawasaki Kanagawa, JP;
Akihiro Yamazaki, Yokohama Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Electronic Devices & Storage Corporation, Tokyo, JP;
Abstract
According to one embodiment, a first decoding circuit calculates likelihood information by executing Viterbi decoding using a parameter for normalizing a branch metric on a signal sequence read from a magnetic disk. The second decoding circuit generates a first bit data sequence by iterative decoding using the likelihood information, and executes a check using a parity check matrix on the first bit data sequence. The control circuit causes the first decoding circuit and the second decoding circuit to repeatedly execute decoding, and updates the parameter in accordance with a check result obtained every time the decoding by the first decoding circuit and the second decoding circuit is executed. An acquisition circuit acquires numerical information corresponding to the number of bit errors included in the first bit data sequence obtained when the number of times of executions of the decoding is equal to a first value.