Baud rate modulation encoding/decoding method and device for remote controller

• US 7,356,141 B2
• Filed: 07/01/2003
• Issued: 04/08/2008
• Est. Priority Date: 07/01/2003
• Status: Expired due to Fees

• Current Assignee: Holtek Semiconductor Incorporated
• Original Assignee: Holtek Semiconductor Incorporated
• Inventors: Hsieh, Ian, Tsai, Jason
• Primary Examiner(s): Zand; Kambiz
• Assistant Examiner(s): Simitoski; Michael J
• Application Number:
  US10/609,659
• Publication Number:
  US 20050002524A1
• Time in Patent Office: 1,743 Days
• Field of Search: 380/31, 380/34, 380/239, 380/32, 348/14.05, 340/426.13, 340/815.6, 340/825.69, 340/5.23, 367/197, 367/199, 398/106, 381/315, 341/176, 341/177, 341/178, 341/181, 341/182, 341/183, 713/182, 307/10.2, 702/56
• US Class Current: 380/31
• CPC Class Codes: H04L 2209/80 Wireless network architectures or network communication protocols for wireless network security H04W12/00
• CPC Class Codes: H04L 9/0822 using key encryption key
• CPC Class Codes: H04L 9/0891 Revocation or update of secret information, e.g. encryption key update or rekeying

Abstract

A encoding/decoding method and device for a remote controller utilizing a baud rate to encrypt data for transmission. The encoding device includes an encoder encoding an identification code into an encrypted code; and an interpreter interpreting the un-encoded portion of the identification code and the encrypted code into a transmission signal. When the encrypted code is in a first base, the plain code corresponding to the encrypted code will be transmitted with a first baud rate; and when the encrypted code is in a second base, the plain code corresponding to the encrypted code will be transmitted with a second baud rate. The decoding device includes a receiver receiving the transmission signal; a interpreter connected to the receiver interpreting the transmission signal into a received signal; an encoder utilizing the same encoding algorithm as in the transmitter to generate a comparison code; and a processor comparing the received signal and the comparison code.

Claims

1. An encoding method for a remote controller, comprising the following steps:

(a) utilizing a identification signal to generate a plain code and an encrypted code;

(b) utilizing the encrypted code to control the baud rate for transmitting the plain code;

when the encrypted code is in a first base, the plain code corresponding to the encrypted code will be transmitted with a first baud rate;

when the encrypted code is in a second base, the plain code corresponding to the encrypted code will be transmitted with a second baud rate.

2. The method of claim 1, wherein the identification signal comprises three sections, the first section is a vender code which represents a vender business identification code, the second section is a user group code which is designated for a group in which users have a same property, the third section is a user code which is used for a single user uniquely.

3. The method of claim 2, wherein the vender code and the user group code are the plain code.

4. The method of claim 1, wherein the step (a) further comprises the following steps:

(a1) adjusting the length of a user code of the identification signal to obtain a temporary code, and the length of the temporary code is same as the length of the plain code;

(a2) encoding the temporary code and the encrypted code that is used previously to generate a new encrypted code;

(a3) outputting the new encrypted code.

5. The method of claim 4, wherein the step (a2) is an Exclusive OR (XOR) operation.

6. The method of claim 4, wherein within the step (a2), the encrypted code being used previously is a pre-determined value when the encoding process is executed for the first time.

7. An encoding device for a remote controller that utilizes baud rate modulation to encrypt a transmission signal, comprising:

an encoder for receiving an identification signal and encoding a part of said identification signal to be an encrypted code;

an interpreter connected to the encoder for interpreting the un-encoded portion of the identification signal and the encrypted code generated by the interpreter to a transmission signal;

wherein the interpreter interprets the length of the waveform of the un-encoded portion of the identification signal according to the following rules;

(1) when the encrypted code is in a first base, the plain code corresponding to the encrypted code is transmitted with a first baud rate;

(2) when the encrypted code is in a second base, the plain code corresponding to the encrypted code is transmitted with a second baud rate.

8. The device of claim 7, wherein the identification signal comprises three sections, the first section is a vender code which represents a vender business identification code, the second section is a user group code which is designated for a group in which the users have same property, the third section is a user code which is used for a single user uniquely.

9. The device of claim 8, wherein the vender code and the user group code are the plain code.

10. The device of claim 8, wherein the encoder further comprises;

an encrypted code generator for receiving the identification signal and encrypting the identification signal with a logical circuit algorithm to generate the encrypted code;

a length normalizer for adjusting the identification signal length; and

a controller connected to the encrypted code generator for outputting the encrypted code or a reset signal according to different situation.

11. The device of claim 10, wherein the encrypted code generator generates the encrypted code with the following steps:

(a) adjusting the length of the user code of the identification signal to obtain a temporary code, and the length of the temporary code is same as the length of the plain code;

(b) encoding the temporary code and the encrypted code that is used previously to generate a new encrypted code;

(c) outputting the new encrypted code.

12. The method of claim 11, wherein the step (b) is an Exclusive OR (XOR) operation.

13. The method of claim 11, wherein within the step (b), the encrypted code being used previously is a pre-determined value when the encoding process is executed first time.