Wireless rolling code security system
First Claim
1. In a processor-based transmitter-receiver system in which a receiver receives coded signals from at least two transmitters, said receiver comprising:
- a circuit to receive a first coded signal from a first transmitter located in a first zone and a second coded signal from a second transmitter located in a second zone where said circuit is located remotely from said first and second zones, each of said coded signals including a unique identification code and a rolling code, said rolling code of the first coded signal varying with each transmission according to a first arithmetic equation, and said rolling code of the second coded signal varying with each transmission according to a second arithmetic equation that is different from the first arithmetic equation;
a memory to store at least two codes, each including a unique identification code and a rolling code;
a processor coupled to said circuit and said memory, the processor to compare each of said received coded signals with each of said stored sets of codes, said processor generating a valid signal if one of said received coded signals matches one of said stored codes.
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Abstract
A processor-based transmitter-receiver system and method in which a receiver receives coded signals from at least two transmitters. A circuit for receiving a first coded signal from a first transmitter and a second coded signal from a second transmitter. Each of the coded signals includes a unique identification code and a variable security code. A memory stores at least two codes, each including a unique identification code and a variable security code. A processor coupled to the circuit and the memory, compares each of the received coded signals with each of the stored sets of codes. The processor generates a valid signal if one of the received coded signals matches one of the stored codes.
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Citations
21 Claims
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1. In a processor-based transmitter-receiver system in which a receiver receives coded signals from at least two transmitters, said receiver comprising:
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a circuit to receive a first coded signal from a first transmitter located in a first zone and a second coded signal from a second transmitter located in a second zone where said circuit is located remotely from said first and second zones, each of said coded signals including a unique identification code and a rolling code, said rolling code of the first coded signal varying with each transmission according to a first arithmetic equation, and said rolling code of the second coded signal varying with each transmission according to a second arithmetic equation that is different from the first arithmetic equation;
a memory to store at least two codes, each including a unique identification code and a rolling code;
a processor coupled to said circuit and said memory, the processor to compare each of said received coded signals with each of said stored sets of codes, said processor generating a valid signal if one of said received coded signals matches one of said stored codes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 12, 21)
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8. In a processor-based transmitter-receiver system in which a receiver receives coded signals from at least two transmitters, said receiver comprising:
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a circuit to receive a first coded signal from a first transmitter and a second coded signal from a second transmitter, each of said coded signals including a unique identification code and a rolling code, said rolling code of the first coded signal varying with each transmission according to a first arithmetic equation, and said rolling code of the second coded signal varying with each transmission according to a second arithmetic equation that is different from the first arithmetic equation;
a memory to store at least two codes, each including a unique identification code and a rolling code;
a processor coupled to said circuit and said memory, the processor to compare each of said received coded signals with each of said stored sets of codes, said processor generating a valid signal if one of said received coded signals matches one of said stored codes; and
a transmitting circuit that wirelessly transmits an output signal in response to said valid signal to a transmitting device that is located remotely from said receiver for initiating a connection to indicate that a security violation has occurred, said output signal including a unique identification code and a rolling code. - View Dependent Claims (9, 10, 11)
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13. A method of verifying coded signals, comprising:
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receiving a first coded signal from a first transmitter located in a first zone and a second coded signal from a second transmitter located in a second zone, each of said coded signals including a unique identification code and a rolling code, said rolling code of the first coded signal varying with each transmission according to a first arithmetic equation, and said rolling code of the second coded signal varying with each transmission according to a second arithmetic equation that is different from the first arithmetic equation;
comparing each of said received coded signals with each of two stored codes, each including a unique identification code and a rolling code;
generating a valid signal if one of said received coded signals matches one of said stored codes; and
wirelessly transmitting a signal to a remote transmitting device for indicating that a security violation has occurred. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification