Alarm-responsive apparatus and method

Details Alarm-responsive apparatus and method Alarm-responsive apparatus and method

1988-07-13

1990-06-19

Ng, Jin F.

Telephonic communications

Emergency or alarm communications

Responsive to sensed nonsystem condition

379 43, 381 58, 381 56, 340533, 340540, H04M 1104, G08B 1700, H04R 2900

Patent

active

049359525

ABSTRACT:
A method and apparatus for detecting a fire-alarm acoustic signal includes an energy discriminator to segregate the desired acoustic tone from background noise. Digital circuitry responds to the active output of the energy discriminaton to dial into a telephone network and execute verification operations before repeating the cycle while the acoustic tone of the fire alarm continues to be detected.

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patent: 3647974 (1972-03-01), Geisler et al.
patent: 4134109 (1979-01-01), McCormick et al.
patent: 4509189 (1985-04-01), Simpson
patent: 4520503 (1985-05-01), Kirst et al.
patent: 4558181 (1985-12-01), Blanchard et al.
patent: 4612535 (1986-09-01), Sequin et al.
patent: 4617555 (1986-10-01), Sheiman
patent: 4668941 (1987-05-01), Davenport et al.

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