| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a trainable transceiver which learns and transmits an activation signal for remotely actuating a device, such as a garage door opener. <P>SOLUTION: The trainable transceiver 43 includes a radio frequency circuit 58 and a micro controller 57 operating in a learning mode or in an operating mode. In the learning mode, the controller recognizes the presence of a variable code, identifies a prestored cryptographic algorithm related to the cryptographic algorithm used by a remote transmitter 65 to generate the variable code, and stores data identifying the cryptographic algorithm and last transmitted code of the activation signal. In the operating mode, the controller generates output data representing a next sequential code of the variable code using the identified cryptographic algorithm and the data representing the last transmitted code. The radio frequency circuit receives the output data and transmits a modulated signal which includes a variable code recognizable by a receiver of a remotely actuated device. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
