Multi-frequency security code transmission and reception

Details Multi-frequency security code transmission and reception Multi-frequency security code transmission and reception

2007-06-12

2007-06-12

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Selective

Intelligence comparison for controlling

C340S005710, C340S005700, C340S005600

Reexamination Certificate

active

10994549

ABSTRACT:
A system is disclosed including a transmitter and receiver for the communication of security codes which may be validated at the receiver to operate equipment. In one embodiment, the transmitter transmits a security code at two frequencies contemporaneously to the receiver which may receive both frequencies and resolve the security code therefrom. The receiver may lock onto one frequency when parts of a security code are detected to the exclusion of the other frequency. In another embodiment, the transmitter selectively transmits security codes at a default frequency which is selected because of a recorded count of prior apparent successful transmission.

REFERENCES:
patent: 6049289 (2000-04-01), Waggamon et al.
patent: 6333698 (2001-12-01), Roddy
patent: 6525645 (2003-02-01), King et al.

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