Environmental interference detection device

Details Environmental interference detection device Environmental interference detection device

1985-07-19

1987-10-13

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

Responsive to intruder energy

367 98, 340566, H04B 106

Patent

active

047003324

ABSTRACT:
An environmental interference detection device, consisting of IC.sub.4, D.sub.5, C.sub.13, R.sub.11, Q.sub.1 and a display unit, in which IC.sub.4 is used for signal phase inversion, D.sub.5 is used for filtering out the negative half wave of the signal, R.sub.11, C.sub.13 form a time delay circuit used to eliminate the sudden outbreak type of signal, and Q.sub.1 is used to drive the display unit. Users of an audio frequency detection device can use the indication of the display unit to adjust the sensitivity of the audio frequency detection device to a proper setting so as to efficiently utilize its monitoring function.

REFERENCES:
patent: 3296587 (1967-01-01), Baker
patent: 3615162 (1971-10-01), Barber
patent: 4554648 (1985-11-01), Greer et al.

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