Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-07-22
1996-04-02
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
340506, 340511, G08B 1300
Patent
active
055044735
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.
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Cecic Dennis
Fong Hartwell
Digital Security Controls Ltd.
Mullen Thomas
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