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:
Sep. 28, 1993
Filed:
Apr. 30, 1991
Applicant:
Inventors:
Peter Gruber, Zwillikon, CH;
Jurg Todtli, Zurich, CH;
Assignee:
Landis & Gyr Betriebs AG, , CH;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; G06F / ; H03H / ;
U.S. Cl.
CPC ...
364572 ; 364576 ; 364574 ; 364483 ; 36472401 ; 36472406 ;
Abstract
A circuit and method for iteratively estimating Fourier coefficients of one or more Fourier components of a measuring signal utilizes a filter to determine the Fourier coefficients for sampling time k-1. The coefficients are utilized to obtain an estimate of the measuring signal at sampling time k. A subtractor circuit subtracts an actual sample of the measuring signal at sampling time k from the estimate of the measuring signal at sampling time k to obtain a difference signal. The difference signal is inputted back into the filter to determine an estimate of the Fourier coefficients at sampling time k.