Trainable transceiver capable of learning variable codes

Patent 5661804 Issued on August 26, 1997. Estimated Expiration Date:

June 27, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Re29525

3337992

Recognition of a received signal as being from a particular transmitter
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Inventors

Assignee

Prince Corporation

Application

No. 495101 filed on 06/27/1995

US Classes:

380/274, Synchronization380/262Transmitting a seed, sequence, or initial value

Examiners

Primary: Cangialosi, Salvatore

Attorney, Agent or Firm

Price, Heneveld, Cooper, DeWitt & Litton

Foreign Patent References

0605996 EP. 07/13/1994
2265482 GB. 09/13/1993
2275552 GB. 08/13/1994
2276023 GB. 09/13/1994
9402920 WO. 02/13/1994
9418036 WO. 08/13/1994

International Class

H04L 009/08

Abstract

A trainable transceiver for learning and transmitting an activation signal that includes a rolling or other variable code for remotely actuating a device, such as a garage door opener. The trainable transceiver preferably includes a receiver, a signal generator, and a controller 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 the remote transmitter 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 signal generator receives the output data from the controller and for transmits a modulated signal, which corresponds to a received activation signal and includes a variable code recognizable by a receiver of a remotely actuated device.

Other References

Kari, Risto, "Fast Training of a High-Speed Voiceband Data Modem Receiver," Doctoral Dissertation, Helinski, 1990, pp. 21, 83-99
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