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:
Apr. 23, 1996
Filed:
May. 28, 1993
Applicant:
Inventors:
Satoshi Itoi, Tokyo, JP;
Shigeru Araki, Tokyo, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M / ; H03M / ; H03M / ; H03M / ;
U.S. Cl.
CPC ...
371 43 ; 341 57 ; 341 59 ; 341 68 ; 371 30 ;
Abstract
In a Viterbi decoding method, there are four playback states which are state S0, state S1, state S2, and state S3. When the signal e(t) that violates the predetermined state transition rules is inputted, bit error correction is performed by detecting the incorrect state and determined the original state. According to the predetermined state transition rules, for example, when the signal e(t) of '-1' is inputted during state S0, it makes a transition to state S0 and the value of the output signal f(t) is made '0'.