Acoustic alarm detection system for telephone activation

Details Acoustic alarm detection system for telephone activation Acoustic alarm detection system for telephone activation

1988-05-27

1990-01-30

George, Keith E.

Telephonic communications

Emergency or alarm communications

Responsive to sensed nonsystem condition

379 41, 340531, H04M 1104, G08B 310

Patent

active

048978620

ABSTRACT:
An electronic device for generating an activation signal in response to detection of an acoustic signal having parameters within respective predetermined ranges, and then automatically dialing a prestored telephone number and transmitting a prerecorded message over the telephone line in response to the activation signal. The device includes a transducer for transducing an acoustic signal into an electrical signal; a detector for outputting an activation signal in response to detection of an acoustic signal having parameters within respective predetermined ranges; and a telephone module for automatically dialing a prestored number and transmitting a prerecorded message in response to the activation signal. The detected parameters include the amplitude of the acoustic signal, the frequency of the acoustic signal, the duration of each burst of the acoustic signal, and the duration of each interval between successive bursts of the acoustic signal.

REFERENCES:
patent: 4189720 (1980-02-01), Lott
patent: 4191947 (1980-03-01), Bouchard et al.
patent: 4417235 (1983-11-01), Del Grande
patent: 4520349 (1985-05-01), Varano
patent: 4520503 (1985-05-01), Kirst et al.
patent: 4558181 (1985-12-01), Blanchard et al.
patent: 4570155 (1986-02-01), Skarman et al.
patent: 4612535 (1986-09-01), Sequin et al.
patent: 4617555 (1986-10-01), Sheiman

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