Road vehicle sensing apparatus and signal processing apparatus therefor

  • US 6,345,228 B1
  • Filed: 08/05/1998
  • Issued: 02/05/2002
  • Est. Priority Date: 02/06/1996
  • Status: Expired due to Term
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First Claim
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1. Signal processing apparatus for processing sensor signals from a road vehicle sensing apparatus of the type defined for a multi lane highway, comprising means arranged to monitor the timing of sensor signals generated from sensors in adjacent lanes of a highway and to provide an indication when such sensor signals could correspond to a double count with a single vehicle being detected by both sensors, and means arranged to respond to said indication from said monitoring means to calculate the geometric mean of the amplitudes of the sensor signals from the sensors in adjacent lanes, and to provide a double count indication if said geometric mean is below a predetermined threshold value.

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