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:
Jul. 25, 2000
Filed:
Dec. 31, 1997
Masayuki Koyama, Tokyo, JP;
Michiru Hori, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a viterbi decoding apparatus, a depuncture circuit is always synchronized with the input of a correct convolutional code irrespective of the degree of noise in the transmission path of the convolutional code. A comparator (4) makes a comparison of error numbers of slip states 1 through N stored in registers (R1) through (RN) of the register group (2), respectively, to detect a register (Rk) (k=either of 1 through N) storing the minimum error number thereby to output a minimum slip state (MINSLIP) indicating the slip state k to a slip state determination portion (5). The slip state determination portion (5) determines the minimum slip state (MINSLIP) to be a determined slip state (DSLIP) when the minimum slip state (MINSLIP) continuously indicates the same slip state M times.