Seismic apparatus for discrimination between track-type vehicles and wheel-type vehicles
First Claim
1. In a vehicle identifying system, seismic detecting means for converting seismic signals generated by passing vehicles into electrical signals, amplifying and clipping means for converting the electrical signals into substantially rectangular waves, means for differentiating and integrating said rectangular waves, and means coupled to said differentiating and integrating means to produce voltage levels indicative of passing vehicles of differing tread characteristics.
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Accused Products
Abstract
10. A vehicle identifying circuit comprising: means for detecting seismic brations created by passing vehicles and converting them into electrical impulses; frequency-sensing circuit means coupled to said detecting means for producing electrical signals in accordance with the frequency characteristics of said impulses, said frequency-sensing circuit means comprising an amplifier, a clipper circuit, a differentiator circuit, a rectifier and an integrator coupled in sequence to produce said electrical signals; and vehicle discriminating circuit means coupled to said frequency-sensing means to convert said signals into output pulses having voltage levels indicative of the character of the suspension system of the passing vehicle.
23 Citations
13 Claims
- 1. In a vehicle identifying system, seismic detecting means for converting seismic signals generated by passing vehicles into electrical signals, amplifying and clipping means for converting the electrical signals into substantially rectangular waves, means for differentiating and integrating said rectangular waves, and means coupled to said differentiating and integrating means to produce voltage levels indicative of passing vehicles of differing tread characteristics.
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7. A vehicle identifying circuit comprising:
- a seismic detector, a clipper and an amplifier, a differentiator, a rectifier and an integrator coupled in sequence and having an output;
an a.c. amplifier coupled to said output; and
rectifier and integrator means coupled to said a.c. amplifier to produce voltage signals indicative of the tread characteristics of the vehicles passing said detector. - View Dependent Claims (8, 9)
- a seismic detector, a clipper and an amplifier, a differentiator, a rectifier and an integrator coupled in sequence and having an output;
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10. A vehicle identifying circuit comprising:
- means for detecting seismic vibrations created by passing vehicles and converting them into electrical impulses;
frequency-sensing circuit means coupled to said detecting means for producing electrical signals in accordance with the frequency characteristics of said impulses, said frequency-sensing circuit means comprising an amplifier, a clipper circuit, a differentiator circuit, a rectifier and an integrator coupled in sequence to produce said electrical signals; and
vehicle discriminating circuit means coupled to said frequency-sensing means to convert said signals into output pulses having voltage levels indicative of the character of the suspension system of the passing vehicle. - View Dependent Claims (11, 12, 13)
- means for detecting seismic vibrations created by passing vehicles and converting them into electrical impulses;
Specification