Beat frequency interference rejection circuitry

Details Beat frequency interference rejection circuitry Beat frequency interference rejection circuitry

G - Physics

08

B

340/124

G08B 13/24 (2006.01) G08B 29/00 (2006.01)

Patent

CA 1073076

ABSTRACT OF THE DISCLOSURE A beat frequency interference rejection circuit oper- ative in an electronic security system to inhibit the provision of an alarm indication for the duration of beat interference caused by an interfering transmitter. A high pass filter is employed having a cut-off frequency which substantially blocks all frequency components produced by a resonant tag circuit while passing frequency components caused by the beat processing. The high pass filter signal is processed to produce an inhibit signal to inhibit alarm production in the presence and for the duration of the beat interference.

278050

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