Ultrasonic wave type alarm device

Details Ultrasonic wave type alarm device Ultrasonic wave type alarm device

1974-03-20

1976-08-24

Farley, Richard A.

Communications: electrical

Systems

Call station

340 1R, 340 3D, G08B 1316, G01S 966

Patent

active

039769887

ABSTRACT:
An ultrasonic wave type alarm device is provided with a narrow band filter for passing only a Doppler effect signal of a human body, and a quick discharge type integration circuit for removing the effect of a Doppler effect signal of a small animal other than the human body, thereby to carry out an alarm operation correctly.

REFERENCES:
patent: 3383678 (1968-05-01), Palmer
patent: 3394342 (1968-07-01), Walker
patent: 3582870 (1971-06-01), Peterson et al.
patent: 3665443 (1972-05-01), Galvin
patent: 3681745 (1972-08-01), Perlman et al.

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