Multi-frequency security code transmission and reception

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

G - Physics

08

C

G08C 17/02 (2006.01) E05F 15/20 (2006.01)

Patent

CA 2527539

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 to the exclusion of the other frequency when parts of a security code are detected. 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

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