Beat frequency interference rejection circuit

Details Beat frequency interference rejection circuit Beat frequency interference rejection circuit

1977-03-14

1978-09-26

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

With particular system function

340572, G08B 1324, G08B 2900

Patent

active

041174666

ABSTRACT:
A beat frequency interference rejection circuit operative 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.

REFERENCES:
patent: 3818472 (1974-06-01), Mauk et al.
patent: 3868669 (1975-02-01), Minasy

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