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. 09, 2001
Filed:
Mar. 10, 1999
Hirofumi Yamauchi, Kitakatsuragi-gun, JP;
Icom Incorporated, Osaka, JP;
Abstract
The object of the invention is to provide a technique of preventing the limit cycle, with a simplified structure, for the IIR digital filter adopting arithmetic operation part of finite word length. A digital filter shown in FIG. 1 includes an extracting means,to extract only 2 bits at a low end of an input signal S,and to output the extracted signal; an amplifying means,to amplify the extracted signal at an amplitude level to a level larger than a critical input level of an IIR digital filter,and output the extracted signal as amplified; and an adding means,to add the input signal S,and the extracted signal S,as amplified and input them into the IIR digital filter