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:
Mar. 26, 2019
Filed:
Jul. 15, 2015
Azbil Corporation, Chiyoda-ku, JP;
Tetsuya Kajita, Chiyoda-ku, JP;
AZBIL CORPORATION, Chiyoda-ku, JP;
Abstract
A digital filter includes: integration calculation units () that are cascade-connected, are fed time-division-multiplexed data, the time-division-multiplexed data being formed of pieces of data on M channels that are time-division multiplexed, the pieces of data on the respective channels being updated at a rate equal to a sampling frequency f, operate in accordance with a clock having a frequency f×M, and integrate the time-division-multiplexed data for every M samples; a frequency conversion unit () that operates in accordance with a clock having a frequency f×M, decimates data at the sampling frequency finput from the integration calculation unit () in the last stage at a sampling frequency f, and delays data obtained as a result of decimation by (M−1) samples; and difference calculation units () that operate in accordance with the clock having the frequency f×M, are cascade-connected to the output of the frequency conversion unit (), and each subtract, from data input thereto, data M samples before.