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:
Feb. 22, 2000
Filed:
Dec. 26, 1996
Francedilla.ois Delumeau, Rennes, FR;
Philippe Piret, Cesson-Sevigne, FR;
Canon Research Centre-France S.A., Cesson Sevigne Cedex, FR;
Abstract
The present invention proposes a method and a device for detecting, amongst a set of signals, the presence of a periodic signal of period of occurrence T, in which a signal discriminating the said signal in the said set of signals is delivered. According to the invention, the discrimination signal is sampled in ln samples over more than one period T, a state value B(i) representing its level, and a true correlation value SR is calculated, by cumulating, for pairs of samples i and i+Z, the instantaneous value of correlation between the state value B(i) and the state value B(i+Z), the samples i and i+Z being located at instants shifted by a period T. Then, for said pairs od samples, the rate r of samples having the said signal over the total number of samples is measured, at least one so-called 'theoretical correlation average' value is determined, and the true correlation value SR is compared with each theoretical correlation average value and from this the presence or absence of the signal to be detected is deduced.