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Vehicle communication system using existing roadway loops

  • US 4,731,867 A
  • Filed: 04/21/1986
  • Issued: 03/15/1988
  • Est. Priority Date: 04/21/1986
  • Status: Expired due to Fees
First Claim
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1. A communication system for enabling transfer of information between a vehicle and a stationary information location, said system comprising:

  • a vehicle mounted transmitter means for enabling transmission of preselected information signals over a relatively small range; and

    stationary receiver means for receiving said information signals transmitted by said transmitter means when within said range,said transmitter means including means for generating an encoded carrier frequency signal lying within a transmitting frequency range different from the frequency range of the vehicle detector system loop signals and containing said preselected information signals,said receiver means including a vehicle detector system loop antenna and means for distinguishing said preselected information signals from conventional vehicle detector signals present in said vehicle detector system loop antenna.

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