Personal acoustic alarm system

Details Personal acoustic alarm system Personal acoustic alarm system

1982-02-12

1984-09-25

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340696, 340384R, 34082574, 367197, 367199, G08B 108, G10K 1100

Patent

active

044738218

ABSTRACT:
The personal acoustic alarm unit produces an audible alarm signal in the audio range to alert persons in the area of the signal transmitter. This audio alarm signal is formed by a plurality of simultaneously generated audio frequency sonic signals, each of which has a different audio frequency. Receiver units are turned to receive the audio frequency sonic signals from a specific transmitter or group of transmitters.

REFERENCES:
patent: 3696384 (1972-10-01), Lester
patent: 3798600 (1974-03-01), Saikaishi et al.
patent: 3805265 (1974-04-01), Lester
patent: 3868639 (1975-02-01), Okada et al.
patent: 3970987 (1976-07-01), Kolm
patent: 4063410 (1977-12-01), Welling
patent: 4075624 (1978-02-01), Sheff
patent: 4088995 (1978-05-01), Paladino
patent: 4121198 (1978-10-01), Tsuboi et al.
patent: 4225953 (1980-09-01), Simon et al.
patent: 4337460 (1982-06-01), Smith et al.

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