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:
May. 15, 2018
Filed:
May. 15, 2015
Azbil Corporation, Chiyoda-ku, JP;
Tetsuya Kajita, Chiyoda-ku, JP;
Azbil Corporation, Chiyoda-ku, JP;
Abstract
A digital filter includes integrator circuits configured to operate based on a clock of a sampling frequency fthat is equal to a sampling frequency of input data and determine a sum of the input data on a sample-by-sample basis, a frequency converter circuit configured to perform decimation on data of the sampling frequency fto reduce the sampling frequency fto a sampling frequency f=f/N, one or more differentiator circuits configured to operate based on a clock of the sampling frequency fand subtract data of an immediately preceding sample from the input data, a differentiator circuit for removal of 50 Hz configured to operate based on the clock of the sampling frequency fand subtract, from the input data, data preceding the input data by a plurality of samples, and a differentiator circuit for removal of 60 Hz configured to operate based on a clock of the sampling frequency fand subtract, from the input data, data preceding the input data by a plurality of samples.