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:
Jun. 18, 2002
Filed:
Jul. 14, 1999
Toshiya Todoroki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A Viterbi decoding apparatus decoding packet data, even at the case that next packet data are continuously inputted soon after the existing packet data, can correctly decode the last part of the existing packet data is provided. The Viterbi decoding apparatus provides a selector that switches a receiving clock synchronized with the packet data and a high speed clock being faster than the receiving clock. During the packet data are received, the selector supplies the receiving clock to a branch metric generator, an ACS (add, compare and select) circuit, a path metric register, a path memory and a trace back circuit. After the reception of the packet data is finished, the selector supplies the high speed clock to the branch metric generator, the ACS circuit, the path metric register and the path memory. With this, the Viterbi decoding apparatus of the present invention can decode the last part of the existing packet data correctly and quickly.