Accession Number : ADD011282

Title :   Security System Signal Processor.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Roth, R R

Report Date : 10 Apr 1984

Pagination or Media Count : 8

Abstract : Alarm and intrusion type identification signals are derived from the output of a security system transducer by a signal processor. The signal processor conditions the transducer output signals to provide rectified and unrectified high pass and low pass frequency signals; develops signals representing either human or vehicle intrusions from the high pass frequency signals; develops signals representing intrusion events from the low pass frequency signals; and, logically classifies each intrusion event as either human or vehicle. Intrusion type identification signals are developed by counting zero crossings of the unrectified high pass frequency signal, measuring current energy of the rectified high pass frequency signal and logically comparing the two values. Intrusion event signals are developed by generating zero crossing windows for the unrectified low pass frequency signal, measuring energy of the rectified low pass frequency signal and comparing energy values with a threshold determined by the number of zero crossing windows having two or more zero crossing. (Author)

Descriptors :   *PATENTS, *PROCESSING EQUIPMENT, *SIGNAL PROCESSING, *ELECTRONIC SECURITY, *INTRUSION DETECTORS, TRANSDUCERS, SCHEMATIC DIAGRAMS, LOW PASS FILTERS, PULSE GENERATORS, INTEGRATORS, COMPARATORS, FULL WAVE RECTIFIERS, SURVEILLANCE, AIRPORTS

Subject Categories : Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE