Vehicle communication system using existing roadway loops
First Claim
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.
5 Assignments
0 Petitions
Accused Products
Abstract
A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a moving vehicle or as the transmitting antenna for signals generated by a transmitter located at the vehicle detector site for transfer to a receiver mounted on a moving vehicle. The information is encoded on a carrier having a frequency outside the normal frequency range of the vehicle detector system, preferably by interrupted carrier pattern processing.
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Citations
14 Claims
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1. A communication system for enabling transfer of information between a vehicle and a stationary information location, said system comprising:
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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. - View Dependent Claims (2, 3, 4)
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- 5. For use in a communication system for enabling transfer of information between a vehicle and a receiver located at a vehicle detector system location and coupled to a vehicle detector loop antenna, a vehicle mounted transmitter means for enabling encoded carrier transmission of preselected information signals over a relatively small range, said transmitter means comprising 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 preselected information signals, a transmitting antenna, and means coupled to said generating means and said transmitting antenna for amplifying said encoded carrier frequency signals.
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9. For use in a communication system for enabling transfer of information between a stationary location having a vehicle detector system with a loop antenna and a vehicle having a transmitter for generating preselected information signals as encoded carrier signals lying within a transmitting frequency range different from the frequency range of the vehicle detector system loop signals;
- a receiver for converting preselected information signals sensed by the vehicle detector system loop antenna to control signals representative of said preselected information signals, said receiver comprising filter means adapted to be coupled to the vehicle detector loop antenna for distinguishing said preselected information signals from conventional vehicle detector signals present in said loop antenna, and detector means for converting those signals distinguished by said filter means to a signal form conformable with an associated control logic circuit.
- View Dependent Claims (10)
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11. A method of transferring preselected information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna, said method comprising the steps of:
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(a) encoding said preselected information on a carrier signal having a frequency lying outside the frequency range of the vehicle detector system loop signals; (b) transmitting the signal resulting from said step (a) of encoding from the moving vehicle; (c) using the vehicle detector system loop antenna as a receiving antenna for the signal transmitted in step (b); and (d) detecting the preselected information signals sensed in step (c) by the vehicle detect or system loop antenna while rejecting the vehicle detect or system loop signals. - View Dependent Claims (12, 13, 14)
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Specification