Acoustic alert sensor

Details Acoustic alert sensor Acoustic alert sensor

1990-06-08

1991-04-09

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

Responsive to intruder energy

H04B 106

Patent

active

050070320

ABSTRACT:
An acoustic detector for detecting acoustic signals produced by vehicles. The detector comprises an acoustic sensor which senses an acoustic signal which is provided to a zero crossing detector. The zero crossing detector provides a digital signal representing the frequency of the incoming acoustic signal. The zero crossing detector's providing this digital signal to a first counter, the first counter's counting each zero crossing, and the first counter's reaching a predetermined count of zero crossings in a predetermined time for a predetermined number of times results in an acoustic alert provided to a secondary device which is put on alert of a vehicle in its vicinity. This secondary device may be a mine.

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