Vehicle communication system using existing roadway loops wherein the physical integrity of the loop is kept intact
First Claim
1. A communication system for enabling transfer of information between a vehicle and a stationary information location having a vehicle detector system with a loop antenna, said loop antenna comprising part of a closed loop circuit containing conventional vehicle detector signals normally lying within a given frequency range, said system comprising:
- stationary transmitter means for enabling transmission of a preselected information signal over a relatively small distance range via the vehicle detector system loop antenna; and
a vehicle mounted receiver means for receiving said preselected information signal transmitted by said stationary transmitter means when within said distance range, said vehicle mounted receiver means including a loop antenna and means for distinguishing said preselected information signal from the conventional vehicle detector signals present in said vehicle detector system loop antenna which lie within the given frequency range, said transmitter means providing transmission of said preselected information signal in a transmitting frequency range different from said given frequency range of said conventional vehicle detector signals;
said transmitter means including means for generating a carrier frequency signal lying within a transmitting frequency range different from the frequency range of the conventional vehicle detector signals and containing a preselected information signal, and means for coupling the output of said generating means to said vehicle detector loop antenna without disturbing the physical integrity of said closed loop circuit so that said preselected information signal can be transferred via said vehicle detector loop antenna to the vehicle mounted receiver means without adversely affecting the operation of said vehicle detector system.
3 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
16 Claims
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1. A communication system for enabling transfer of information between a vehicle and a stationary information location having a vehicle detector system with a loop antenna, said loop antenna comprising part of a closed loop circuit containing conventional vehicle detector signals normally lying within a given frequency range, said system comprising:
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stationary transmitter means for enabling transmission of a preselected information signal over a relatively small distance range via the vehicle detector system loop antenna; and a vehicle mounted receiver means for receiving said preselected information signal transmitted by said stationary transmitter means when within said distance range, said vehicle mounted receiver means including a loop antenna and means for distinguishing said preselected information signal from the conventional vehicle detector signals present in said vehicle detector system loop antenna which lie within the given frequency range, said transmitter means providing transmission of said preselected information signal in a transmitting frequency range different from said given frequency range of said conventional vehicle detector signals;
said transmitter means including means for generating a carrier frequency signal lying within a transmitting frequency range different from the frequency range of the conventional vehicle detector signals and containing a preselected information signal, and means for coupling the output of said generating means to said vehicle detector loop antenna without disturbing the physical integrity of said closed loop circuit so that said preselected information signal can be transferred via said vehicle detector loop antenna to the vehicle mounted receiver means without adversely affecting the operation of said vehicle detector system. - View Dependent Claims (2, 3, 4, 5, 6)
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7. For use in a communication system for enabling transfer of information between a vehicle mounted receiver stationary location having a vehicle detector system and a vehicle detector loop antenna, said loop antenna comprising part of a closed loop circuit containing conventional vehicle detector signals normally lying within a given frequency range;
- a transmitter means at said stationary location for enabling transmission of a preselected information signal over a relatively small distance range, said transmitter means comprising means for generating a carrier frequency signal lying within a transmitting frequency range different from the frequency range of the conventional vehicle detector signals and containing a preselected information signal, means coupled to said generating means for amplifying said carrier frequency signal, and means for coupling the output of said amplifying means to said vehicle detector loop antenna without disturbing the physical integrity of said closed loop circuit sot hat said preselected information signal can be transferred via said vehicle detector loop antenna to the vehicle mounted receiver without adversely affecting the operation of said vehicle detector system.
- View Dependent Claims (8, 9, 10, 11, 12)
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13. For use in a communication system enabling transfer of information between a stationary location and a vehicle, said stationary location including a vehicle detector system and a vehicle detector system loop antenna, said loop antenna comprising part of a closed loop circuit containing conventional vehicle detector signals normally lying within a given frequency range, said stationary location having a transmitting frequency range different from the given frequency range of the conventional vehicle detector signals, said transmitter means including means for generating a carrier frequency signal lying within a transmitting frequency range different from the frequency range of the conventional vehicle detector signals and containing a preselected information signal, and means for coupling the output of said generating means to said vehicle detector loop antenna without disturbing the physical integrity of said closed loop circuit so that said preselected information signal can be transferred to said vehicle detector system loop antenna without adversely affecting the operation of said vehicle detector system;
- a vehicle mounted antenna, and a vehicle mounted receiver means for converting a preselected information signal sensed by the vehicle mounted antenna to a signal representative of said preselected information signal, said receiver means comprising filter means adapted to be coupled to the vehicle mounted antenna for distinguishing said preselected information signal from the conventional vehicle detector signals present in said vehicle detector system 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 (14, 15, 16)
Specification