An acoustic highway monitor

Details An acoustic highway monitor An acoustic highway monitor

G - Physics

08

G

G08G 1/04 (2006.01)

Patent

CA 2228481

Apparatus and method are provided for detecting vehicles which are moving through a predetermined zone. The apparatus includes a first acousto-electric transducer for receiving a first acoustic signal which is radiated from the motor vehicle and for converting the first acoustic signal into a first electric signal that represents the first acoustic signal. The apparatus also includes a second acousto-electric transducer for receiving a second acoustic signal which is radiated from the motor vehicle and for converting the second acoustic signal into a second electric signal that represents the second acoustic signal. The apparatus further includes spatial discrimination circuitry for creating a third electric signal which is based both on the first electric signal and on the second electric signal, that substantially represents the acoustic energy emanating from the predetermined zone. The apparatus still further includes frequency discrimination circuitry for creating a fourth signal which is based on the third signal. Finally, the apparatus includes interface circuitry for creating an output signal which is based on the fourth signal, such that the output signal is asserted when the motor vehicle is within a predetermined detection zone, and such that the output signal is retracted when the motor vehicle is not within the predetermined detection zone.

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