Interface for a supervised multi-input audible warning system

Details Interface for a supervised multi-input audible warning system Interface for a supervised multi-input audible warning system

1991-04-10

1994-03-08

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340511, 340517, 340519, 340521, 340692, G08B 2900

Patent

active

052931552

ABSTRACT:
An interface for a supervised multiple input, audible warning system is disclosed. The interface continuously monitors or supervises a plurality of circuits between a control unit and an alarm unit for electrical faults. Each circuit represents a separate alarming condition. All the circuits are coupled to but normally isolated from each other and a common circuit for driving a piezoelectric device. The isolation is accomplished by means of a semiconductor switch normally reverse biased. The semiconductor switch prevents the supervising current of one circuit from driving the piezo by isolating all possible flow paths to all circuits without current flow in the alarming direction. Upon sensing an alarming condition, the direction of the current in the alarming circuit reverses resulting in forward biasing the semiconductor switch. The current in the alarming circuit, no longer isolated from the common circuit, actuates the common circuitry necessary for generating the audible warning. The interface circuits may be connected to an addressable micro controller for selecting a multitude of sounds.

REFERENCES:
patent: 3430231 (1969-02-01), Weld
patent: 4060803 (1977-11-01), Ashworth, Jr.
patent: 4064507 (1977-12-01), Schmitz
patent: 4401971 (1983-08-01), Saito et al.
patent: 4438422 (1984-03-01), Nojiri et al.
patent: 4785280 (1987-01-01), Fubini et al.
D. R. Pacholok, "Digital to Audio Decoder," 73 Magazine Oct. 28, 1977.
C. Durst, "Scanning Adapter for FM Transceivers," 73 Magazine Apr., 1973.
Adaptatone Multiple Tone Industrial Signal brochure, Jan. 1983.

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