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:
Oct. 21, 2003
Filed:
Jan. 20, 2000
Applicant:
Inventors:
Takanori Mizuno, Tokyo, JP;
Yoshiteru Imaeda, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M 1/303 ;
U.S. Cl.
CPC ...
H03M 1/303 ;
Abstract
A circuit for executing range shift-up/-down of pass metric values is provided as an additional circuit preceding to an ACS circuit for adding and comparing branch metric computation values and preceding pass metric values and selecting the highest likelihood pass. It is thus possible to permit effective use of RAM bits by executing range shift-up and the accuracy of the effective bits of input data when it is necessary to expand the effective bits of the pass metric values, while executing range shift-down and increasing the accuracy of the input data when the effective bits of the pass metric values are not fully used.