Quasi-stationary noise cancellation system

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

1977-10-05

1979-09-18

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

393 5PD, G08B 1324, G08B 1329

Patent

active

041684966

ABSTRACT:
An electronic security system detects a resonant tag circuit even in the presence of a substantially 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.

REFERENCES:
patent: 3743768 (1973-07-01), Copland
patent: 3863244 (1975-01-01), Lichtblau
patent: 3885234 (1975-05-01), Fujimoto
patent: 3988533 (1976-10-01), Mick et al.
patent: 4016529 (1977-04-01), Inuzuka et al.
patent: 4025718 (1977-05-01), Paretti
Kosuke Matsunaga, "Multi Video Sensor,", Soc. of Photo-Opt. Inst. Engrs. Seminar on Solving Probs. in Security..., NY (20-21 Sep. 1972).

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