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:
Oct. 23, 2001
Filed:
Jun. 25, 1997
Thomas Reck, Berlin, DE;
Tevfik Sezi, Berlin, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A digital process for determining the effective value of a periodic electric test signal is provided, where the test signal is sampled during a sampling interval that differs in duration from the period of the test signal, and after performing an analog-digital conversion of the samples, they are squared, added up and averaged. The square root of the resulting average is calculated. To be able to determine the effective value rapidly and with a high accuracy according to this invention with a sampling interval that corresponds to two periods of the electric test signal with an odd numbered M of samplings with N samples that fall in one period of the test signal, the values up to and including the Nth sample are squared and added up. To this is added a correction factor that corresponds to half of the square of a subtotal formed from one-quarter of the Nth sample and three-quarters of the (N+1)th sample, where N=(M−1)/2. Then the average is calculated over the number M/2.