Quasi-stationary noise cancellation system

Details Quasi-stationary noise cancellation system Quasi-stationary noise cancellation system

G - Physics

08

B

340/124

G08B 13/22 (2006.01) G08B 13/24 (2006.01) G08B 29/18 (2006.01) H04B 5/00 (2006.01)

Patent

CA 1118865

ABSTRACT An electronic security system for detection of a resonant tag circuit even in the presence of a substantial- ly identical spurious resonance. The spurious resonance is fixed or quasi-stationary in time, in relation to the time that a resonant tag circuit is present in a security system. A representation of the quasi-stationary noise is stored in an electronic memory and is subtracted from a received signal to automatically cancel the interfering noise.

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