Controlled wave pattern ultrasonic burglar alarm

Details Controlled wave pattern ultrasonic burglar alarm Controlled wave pattern ultrasonic burglar alarm

1973-09-07

1979-10-23

Budd, Mark O.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

310317, 310319, 310324, H01L 4110

Patent

active

041722531

ABSTRACT:
A burglar alarm employs ultrasonic sound to protect a plurality of rooms. Each protected room contains a transmitter which emits an ultrasonic signal in a controlled wave pattern. The signal is received, filtered, and detected to determine if a doppler shift in the ultrasonic signal of a particular amplitude and frequency characteristic of human movement is present. If so, an alarm is given.

REFERENCES:
patent: 3331970 (1967-07-01), Dundon et al.
patent: 3578995 (1971-05-01), Massa
patent: 3578995 (1971-05-01), Massa
patent: 3708702 (1973-01-01), Brunnert et al.
patent: 3736632 (1973-06-01), Barrow
patent: 3749854 (1973-07-01), Mifune
patent: 3761956 (1973-09-01), Takahashi et al.
patent: 3815129 (1974-06-01), Sweany
patent: 3912952 (1975-10-01), Kumon et al.

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