Communications – electrical: acoustic wave systems and devices – Receiver circuitry – Responsive to intruder energy
Patent
1981-11-17
1984-04-10
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
Responsive to intruder energy
340566, G08B 1300
Patent
active
044425147
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.
REFERENCES:
patent: 3727206 (1973-04-01), Geil et al.
patent: 3774190 (1973-11-01), Kyle
patent: 3824532 (1974-07-01), Vandierendonck
patent: 3913085 (1975-10-01), Farstad
Farley Richard A.
Matthews Willard R.
Singer Donald J.
The United States of America as represented by the Secretary of
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