Data transmission for remote-controlled security system

• US 5,563,600 A
• Filed: 06/22/1994
• Issued: 10/08/1996
• Est. Priority Date: 06/30/1993
• Status: Expired due to Term

• Current Assignee: Code Systems Incorporated (VOXX International Corporation)
• Original Assignee: Alpine Electronics Incorporated (Alps Alpine Co., Ltd.)
• Inventors: Miyake, Takashi
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): MANNAVA, ASHOK K
• Application Number:
  US08/263,846
• Time in Patent Office: 839 Days
• Field of Search: 341/173, 341/176, 341/178, 340/825.69, 340/825.56, 340/825.57, 340/825.62, 340/825.72, 340/825.34, 340/825.30
• US Class Current: 341/173
• CPC Class Codes: G07C 2009/00253 dynamically, e.g. variable code - rolling code
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks

Abstract

A remote-controlled apparatus improves the reliability of a vehicle security system. Each time the transmitting unit transmits data, a first code updating section changes a variable code storage in a memory in the transmitting unit by predetermined shift processing to form a new variable code, and replaces the preceding variable code with the new variable code. An ID code setting section sets an ID code formed of the variable code and a fixed code. Predetermined data including the ID code and command signals is transmitted. When the receiving unit receives the predetermined data, the fixed code and the variable code in the received ID code are compared with a fixed code and a variable code stored in the receiving unit. If it is thereby determined that the fixed codes and predetermined portions of the variable codes coincide with each other, a predetermined security operation is started or stopped according to the content (command signals) of the received data, and a code updating section in the receiving unit changes the received variable code by predetermined shift processing to form a new variable code, and replaces the preceding stored variable code in the receiving unit with the new code.

Claims

1. A remote-controlled apparatus comprising a transmitting unit and a receiving unit, predetermined data being transmitted from said transmitting unit to said receiving unit, said transmitting unit including:

a first code updating section for updating a first ID code; and

a data transmitting section for transmitting predetermined data including the updated first ID code to said receiving unit;

said receiving unit including;

a data receiving section for receiving the predetermined data from said transmitting unit;

a code comparison section for comparing the first ID code with a second ID code stored in the receiving unit;

an operation control section for starting or stopping a predetermined operation according to a content of the received predetermined data when a coincidence occurs between the first ID code of the predetermined data and the stored second ID code as a result of the comparison made by said code comparison section; and

a second code updating section for replacing the second ID code with the received first ID code in a predetermined manner to update the second ID code when a coincidence occurs between the first ID code and the second ID code;

wherein the first ID code comprises a variable code including a series of bits, and wherein the first code updating section of said transmitting unit shifts values associated with each of the series of bits of the variable code stored in the transmitting unit by a predetermined shift value while replacing one bit with a predetermined value according to a transmission timing to form an updated variable code.

2. A remote-controlled apparatus according to claim 1, wherein said predetermined data includes the first ID code and a command code.

3. A remote-controlled apparatus according to claim 1, wherein said first ID code further includes a fixed code.

4. A remote-controlled apparatus according to claim 1, wherein each of said transmitting unit and said receiving unit includes a memory for respectively storing the first ID code and the second ID code.

5. A remote-controlled apparatus according to claim 1, wherein said series of bits includes a most significant bit and a least significant bit, and wherein the values associated with the series of bits of the variable code are shifted from the most significant bit to the least significant bit, and wherein the most significant bit is updated with the predetermined value.

6. A remote-controlled apparatus according to claim 3, wherein said code comparison section of said receiving unit compares the fixed code of the first ID code with a stored fixed code of the second ID code, and compares the variable code of the first ID code with a stored variable code of the second ID code.

7. A remote-controlled apparatus according to claim 1, wherein said receiving unit comprises a security receiving unit, said remote-controlled apparatus comprises a security apparatus, and said predetermined operation comprises a security operation.

8. A remote-controlled apparatus comprising a transmitting unit and a receiving unit, predetermined data being transmitted from said transmitting unit to said receiving unit, said transmitting unit including a first memory for storing a first fixed code and a first variable code, the first variable code including a series of bits, said receiving unit including a second memory for storing a second fixed code and a second variable code, the second variable code including a series of bits, said transmitting unit including:

a first code updating section for updating the first variable code stored in the transmitting unit by shifting values associated with each bit of the series of bits by a predetermined shift value while replacing a first bit the first variable code with a first predetermined value according to a transmission timing to form an updated first variable code, and storing the updated first variable code in the first memory; and

a data transmitting section for transmitting predetermined data including the first fixed code and the updated first variable code to said receiving unit;

said receiving unit including;

a data receiving section for receiving the predetermined data from said transmitting unit;

a code comparison section for comparing the first fixed code with the second fixed code and for comparing the first variable code with the second variable code stored in said transmitting unit;

an operation control section for starting or stopping a predetermined operation according to a content of the received predetermined data when the first and second fixed codes and predetermined portions of the first and second variable codes coincide with each other as a result of the comparison made by said code comparison section; and

a second code updating section for updating the second variable code by shifting the values associated with each bit of the first variable code by the predetermined shift value while updating a first bit of the first variable code with a second predetermined value to form an updated second variable code, and storing the updated second variable code in the second memory when the first and second fixed codes and the predetermined portions of the first and second variable codes coincide with each other.

9. A remote-controlled apparatus according to claim 8, wherein, in said second code updating section, when the first and second fixed codes coincide with each other while the predetermined portions of the first and second variable codes do not coincide with each other, the received first variable code is shifted by the predetermined shift value while updating the first bit of the second variable code with a second predetermined value to form a second updated second variable code, and replacing the second variable code stored in the second memory with the second updated second variable code.

10. A remote-controlled apparatus according to claim 8, wherein the each of the first and second variable codes include a most significant bit and a least significant bit, and wherein values associated with each of the first and second variable codes are respectively shifted from the most significant bit to the least significant bit, and wherein the most significant bits of the first and second variable codes are respectively updated with the first and second predetermined values.

11. A remote-controlled apparatus according to claim 8, wherein one of said first and second predetermined values comprises an arbitrary value added to a most significant bit of one of the shifted first and second variable coded.

12. A remote-controlled apparatus according to claim 8, wherein one of said first and second predetermined values comprises sampling data obtained by sampling in predetermined cycles from a moment at which a key of said transmitting unit is depressed to a moment at which the key is released from the depressed state, said sampling data being obtained at the moment at which the key is released from the depressed state.

13. A remote-controlled apparatus according to claim 8, wherein the portions of the first and second variable codes compared by the code comparison means excludes respective most significant bits associated with each of the first and second variable codes.

14. A remote-controlled apparatus according to claim 8, wherein the content of the received predetermined data includes a command code.

15. A remote-controlled apparatus according to claim 8, wherein said receiving unit comprises a security receiving unit, said remote-controlled apparatus comprises a security apparatus, and said predetermined operation comprises a security operation.

16. A data transmission method which transmits predetermined data from a transmitting unit to a receiving unit, said transmitting unit including a first memory for storing a first fixed code and a first variable code, the first variable code including a series of bits, said receiving unit including a second memory for storing a second fixed code and a second variable code, the second variable code including a series of bits, the method comprising the steps of:

in the transmitting unit, shifting values associated with the first variable code by a predetermined shift value while replacing a first bit of the first variable code with a predetermined value to form an updated first variable code, storing the updated first variable code in the first memory, setting an ID code containing the updated first variable code and the first fixed code, and transmitting predetermined data including the set ID code to the receiving unit; and

in said receiving unit, receiving the predetermined data from the transmitting unit, comparing the first fixed code and the first variable code in the ID code with the second fixed code and the second variable code, and when the first and second fixed codes and predetermined portions of the first and second variable codes coincide with each other as a result of the comparison, performing a predetermined operation according to a content of the received predetermined data, updating the second variable code by shifting the values associated with each bit of the received first variable code by the predetermined shift value while updating the first bit with a predetermined value to the form an updated second variable code, and storing the updated second variable code in the second memory.

17. A data transmission method according to claim 16, wherein in said step of comparing the first and second fixed codes and the first and second variable codes, when the first and second fixed codes coincide with each other while the predetermined portions of the first and second variable codes do not coincide with each other, then in the subsequent step of updating the second variable code with the updated second variable code, the received first variable code is shifted by the predetermined shift value, the first bit is updated by the second predetermined value to form a second updated second variable code, and the second variable code stored in the second memory is replaced with the second updated second variable code.

18. A data transmission method according to claim 16, wherein the first and second variable codes in the transmitter and in the receiver are shifted in a direction from a most significant bit to a least significant bit.

19. A data transmission method according to claim 16, wherein one of the first and second predetermined values comprises an arbitrary value added to a most significant bit of the shifted first and second variable codes.

20. A remote controller transmitting unit for transmitting predetermined data to a receiving unit, said transmitting unit comprising:

a memory for storing a code;

a code updater connected to said memory, whereby said code updater shifts the code stored in said memory by a predetermined shift value and replaces one bit of the code with a randomly generated value;

a code setter connected to said memory, whereby said code setter sets the predetermined data as including the code stored in said memory; and

a transmitting circuit connected to said code setter, for transmitting the predetermined data.

21. A method for transmitting predetermined data from a transmitting unit to a receiving unit, comprising the steps of:

storing a code in said transmitting unit;

updating said code stored in said transmitting unit by shifting said code by a predetermined shift value and replacing a bit of the code with a randomly generated value;

combining the updated code with command data; and

transmitting the combined updated code and said command data to said receiving unit.