Wireless rolling code security system

• US 6,243,000 B1
• Filed: 02/13/1998
• Issued: 06/05/2001
• Est. Priority Date: 02/13/1998
• Status: Expired due to Term

• Current Assignee: Tsui, Philip Y. W.
• Original Assignee: Tsui, Philip Y. W.
• Inventors: Tsui, Philip Y. W.
• Primary Examiner(s): Zimmerman, Brian
• Assistant Examiner(s): Dalencourt, Yves
• Application Number:
  US09/023,393
• Time in Patent Office: 1,208 Days
• Field of Search: 340/825.31, 340/825.34, 340/825.69, 340/825.73, 340/825.72, 340/524, 340/870.11, 340/539, 340/5.1, 340/5.2, 340/5.8, 340/5.26, 341/173, 341/174
• US Class Current: 340/5.21
• CPC Class Codes: G07C 2009/00253 dynamically, e.g. variable code - rolling code
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks
• CPC Class Codes: G08B 25/008 Alarm setting and unsetting, i.e. arming or disarming of the security system

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.

Claims

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.

2. The receiver of claim 1, wherein said first coded signal is transmitted via a first channel and said second coded signal is transmitted via a second channel.

3. The receiver of claim 1, wherein said circuit further receives a third coded signal from a third transmitter located in said first zone, said third coded signal having a unique identification code and a rolling code.

4. The receiver of claim 3, wherein said circuit further receives a fourth coded signal from a fourth transmitter located in said second zone, said fourth coded signal having a unique identification code and a rolling code.

5. The receiver of claim 1, wherein said memory stores one of said codes in a first memory location corresponding to said first zone, and stores said other one of said codes in a second memory location corresponding to said second zone.

6. The receiver of claim 1, wherein said each of said rolling codes varies in accordance with each transmission of said coded signals, and said first coded signal indicates a condition of a sensor.

7. The receiver of claim 6, wherein said processor generates a predetermined value of each of said variable security codes in accordance with each of said received unique identification code, and said second coded signal enables and disables the receiver.

12. The receiver of claim 1, wherein said receiver further comprises a housing that encloses said circuit, said memory and said processor, said housing being coupled to a tamper circuit that generates a signal upon detection of a predetermined pressure value.

21. The receiver of claim 1, wherein the processor generates one of the at least two codes including an expected variable security code associated with and in response to receiving one of the coded signals, said processor compares said variable security code of said received coded signal with said expected variable security code of said associated code.

8. 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 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.

9. The receiver of claim 8, further comprising an indicator circuit that is coupled to receive said output signal, said indicator circuit generating an indicator signal indicative of said output signal.

10. The receiver of claim 9, wherein said indicator circuit comprises a sound generator circuit.

11. The receiver of claim 9, wherein said indicator circuit is located remotely and is not physically coupled to the receiver.

13. A method of verifying coded signals, comprising:

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.

14. The method of claim 13, wherein said first coded signal is transmitted via a first channel and said second coded signal is transmitted via a second channel.

15. The method of claim 13, further comprising receiving a third coded signal from a third transmitter located in said first zone, said third coded signal having a unique identification code and a rolling code.

16. The method of claim 15, further comprising receiving a fourth coded signal from a fourth transmitter located in said second zone, said fourth coded signal having a unique identification code and a rolling code.

17. The method of claim 13, further comprising storing one of said sets of codes in a first memory location corresponding to said first zone, and storing said other one of said sets of codes in a second memory location corresponding to said second zone.

18. The method of claim 13, further comprising varying each of said variable security codes in accordance with each transmission of said coded signals, and wherein said first coded signal indicates a condition of a sensor.

19. The method of claim 13, further comprising generating a predetermined value of each of said variable security codes in accordance with each of said received unique identification code, and wherein said second coded signal enables and disables the receiver.

20. The method of claim 13, wherein said signal includes a unique identification code and a rolling code.