Inductively coupled keyable control circuit and keying...

Details Inductively coupled keyable control circuit and keying... Inductively coupled keyable control circuit and keying...

E - Fixed Constructions

05

B

340/125

E05B 47/00 (2006.01) G07C 11/00 (2006.01) G08B 21/00 (2006.01)

Patent

CA 1098993

INDUCTIVELY COUPLED KEYABLE CONTROL CIRCUIT AND KEYING CIRCUIT THEREFORE USING HYBRID DETECTION MEANS ABSTRACT OF THE DISCLOSURE A keyable control circuit sequentially connects a widely swept fm rf signal to sensing coils at a plurality of detection locations. While rf energy is fed to one of the sensing coils, all other sensing coils are gated off. A resonant detector generates a first signal when an external keying circuit containing a tuned circuit, resonant at a correct first frequency, is inductively coupled to one of the sensing coils. A time-gated envelope detector generates a second signal when the external keying circuit contains a second tuned cir- cuit resonant at a correct second frequency. When the first and second signals are simul- taneously present, gating circuits generate a control output signal which may be used to unlock a door or perform other functions access to which is restricted to those pos- sessing keys.

271492

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