Method for safeguarding code words of a remote control system

Details Method for safeguarding code words of a remote control system Method for safeguarding code words of a remote control system

1991-12-02

1992-10-27

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082531, 307 101, H04B 1000

Patent

active

051593297

ABSTRACT:
A remote control system having of one or more independent transmitters transmitting code words to a receiver, wherein the code word includes an unalterable code portion, transmitted upon each code transmission together with a code portion which is variable in accordance with a predetermined algorithm, being stored in object-specific fashion both in each transmitter and in the receiver fixed to the object. A synchronizing procedure between a transmitter and the receiver, which can in any case only be carried out in dependence on a mechanical key restriction, is only possible if the individual object-specific code portion of the respective transmitter has been stored and is retrievable in the receiver.

REFERENCES:
patent: 4509093 (1985-04-01), Stellberger
patent: 4535333 (1985-08-01), Twardowski
patent: 4596985 (1986-06-01), Bongard et al.
patent: 4646080 (1987-02-01), Genest et al.
patent: 4686529 (1987-08-01), Kleefeldt
patent: 4723121 (1988-02-01), vanden Boom et al.
patent: 4870400 (1989-09-01), Downs et al.
patent: 4888575 (1989-12-01), De Vaulx

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