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:
Mar. 26, 1996
Filed:
May. 20, 1993
Toshiya Todoroki, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A Viterbi decoder includes a first inverse mapping circuit, first to fourth branch metric generators, first to eighth accumulator switch circuits (ACS circuits) with one ACS circuit corresponding to one of the eight states of the feedback-type convolutional encoder, a path memory, and a re-encoder for the purpose of decoding an influential bit and a redundant bit of 4-bit error-correcting encoded information symbol string from I-channel data and Q-channel data. A Viterbi decoder also includes first and second shift registers having a number of levels determined according to the delay in the re-encoder and the delay in the path memory and a second inverse mapping circuit for the purpose of decoding noncoding bits of 4-bit error-correcting encoded information symbol string using the I-channel data and the Q-channel data.