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:
Nov. 28, 2000
Filed:
Dec. 09, 1997
Hiroyuki Ino, Gunma, JP;
Sony Corporation, Tokyo, JP;
Abstract
Partial response (1, 1) is applied to a partitioned MSN (partitioned-matched spectral null) code. A branch metric (BM) obtained in a calculation block is directly supplied to a selector, and it is also supplied to the selector via an adder. The adder adds a predetermined value to the branch metric in such a manner as to decrease the degree of likelihood associated with a state transition corresponding to the branch metric. A determination block detects an invalid state transition in a detection trellis, which cannot be generated by the partitioned MSN code, on the basis of the number of 1s or 0s included in the partitioned MSN code. The selector selects either the branch metric added with the predetermined value or the branch metric added with no predetermined value depending on the detection result of the determination block. A path metric is calculated using the selected branch metric added with the predetermined value or added with no predetermined value.