Intruder alarm system

Details Intruder alarm system Intruder alarm system

1978-11-20

1981-06-02

Trafton, David L.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

Responsive to intruder energy

367901, G08B 1300

Patent

active

042714915

ABSTRACT:
The present invention relates to an intruder alarm system which compensates for background and other interfering noises. The system comprises dual amplifiers, one a main channel and the other a control channel wherein the control channel is responsive primarily to background and other interfering noises and develops a control signal which when applied as a control signal to modify the amplification characteristics of the main amplifier effectively removes the effect of the background and other interfering noises from the output of the main channel.

REFERENCES:
patent: 3487396 (1969-12-01), Perelman
patent: 3696369 (1972-10-01), Laymon et al.
patent: 3710336 (1973-01-01), Lerner
patent: 3732536 (1973-05-01), Larka et al.
patent: 3745552 (1973-07-01), Wilt
patent: 3958213 (1976-05-01), Scott et al.

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