Communications – electrical: acoustic wave systems and devices – Receiver circuitry – Responsive to intruder energy
Patent
1970-02-19
1991-10-01
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
Responsive to intruder energy
H04B 106
Patent
active
050540068
ABSTRACT:
A detection system for indicating the presence of motorized equipment in a esignated area having an acoustic sensor, a seismic sensor and an acoustic signal transmitter. The seismic sensor output, processed to discriminate against vibrations of short duration, is fed along with the acoustic sensor output, to an "ANDing" circuit which gates the acoustic transmitter. The acoustic sensor output is passed to the transmitter only during coincidence of seismic and acoustic detection.
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patent: 3995223 (1976-11-01), Gimber
Cotilla Edward J.
Gimber George A.
Picard Salvatore R.
Starry Robert F.
Bechtel James B.
Pihulic Daniel T.
The United States of America as represented by the Secretary of
Tura James V.
Verona Susan E.
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