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:
Aug. 08, 1995
Filed:
Feb. 15, 1994
Yuichi Maruyama, Tokyo, JP;
NEC Corporation, , US;
Abstract
In a digital filtering circuit for converting an input data signal (a) of a sampling frequency f.sub.s into an output data signal (OUT) of an oversampling frequency Nf.sub.s which is N times the sampling frequency f.sub.s. The digital filtering circuit comprises a combination of a calculating circuit (30), and first and second integrating circuits (40, 50). The first integrating circuit (40) integrates a calculated signal (d) in synchronism with the oversampling frequency Nf.sub.s to produce a first integration result signal (b) and a first delayed signal (e). The second integrating circuit (50) integrates the first delayed signal (e) in synchronism with the oversampling frequency Nf.sub.s to produce a second integration result signal (c) and a second delayed signal (f) as the output data signal (OUT). The calculating circuit (30) carries out a predetermined calculation on the input data signal (a), the first integration result signal (b), and the second integration result signal (c) in synchronism with the sampling frequency f.sub.s to produce the calculated signal (d). The predetermined calculation is represented by an equation as follows: