Communications – electrical: acoustic wave systems and devices – Receiver circuitry – Responsive to intruder energy
Patent
1970-02-13
1990-12-04
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
Responsive to intruder energy
340566, H04B 106
Patent
active
049758918
ABSTRACT:
A land vehicle sensing device includes a geophone for detecting vibratory gnals and a bandpass amplifier for limiting the electrical output of the geophone to those signals indicative of land vehicles. A real-time frequency analyzer provides a normalized power density spectrum signal which is threshold detected and averaged to provide an indication of land vehicle intrusion.
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patent: 3258762 (1966-06-01), Donner
patent: 3261009 (1966-07-01), Stetten et al.
patent: 3296587 (1967-01-01), Baker
patent: 3337800 (1967-08-01), Halley et al.
patent: 3431405 (1969-03-01), Dawson
Hebbert Ralph S.
Hug Edward H.
Wineland William C.
Moskowitz Nelson
Pihulic Daniel T.
The United States of America as represented by the Secretary of
Walden Kenneth E.
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