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. 02, 1996
Filed:
Jul. 22, 1993
Dennis Cecic, Scarborough, CA;
Hartwell Fong, Scarborough, CA;
Digital Security Controls Ltd., Downsview, CA;
Abstract
A motion detecting system is disclosed where the signal from the transducer is analysed in a manner to distinguish between actual motion indicative of an intruder, typical noise expected for the area under supervision and the transducer and a signal which indicates a trouble condition (circuit failure, masking, or other trouble condition having a known signal signature). The system samples the signal to provide a simplified representation of the actual signal. The results of the sampling process for a given sample period allows good assessment of the actual conditions of the supervised area. In a preferred embodiment a host of experiment segments are compared within the sample period for change therebetween with the amount of change accumulated for the sample period. This measure of change particularly at different magnitude levels provides a reliable basis for assessing alarm and trouble conditions. This approach can also be combined with other approaches for recognizing trouble conditions and only producing a trouble output signal based on a combined analysis of the outputs of the various approaches.