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:
Apr. 30, 2019
Filed:
Sep. 19, 2016
Abb Limited, Stonehouse, Gloucestershire, GB;
Ray Keech, Stonehouse, GB;
ABB Limited, Stonehouse, Gloucestershire, GB;
Abstract
A method and apparatus are for processing a periodic data-carrying signal to reduce periodic interference at either of a first fundamental frequency or a second fundamental frequency, the second fundamental frequency being different from the first fundamental frequency. The periodic data-carrying signal is derived from an excitation signal having an excitation frequency, the excitation frequency being a sub-multiple of the first fundamental frequency. The data-carrying signal is subjected to both a comb filter to reject interference at the first fundamental frequency, and an averaging/integrating filter to reject interference at the second fundamental frequency. A comb filter delay period is related to the first fundamental frequency and the averaging/integrating filter averages or integrates over a period related to the second fundamental frequency.