Warning method and apparatus and parallel correlator particularl

Details Warning method and apparatus and parallel correlator particularl Warning method and apparatus and parallel correlator particularl

1990-08-02

1992-11-24

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340531, 340505, 34082508, G08B 108

Patent

active

051666642

ABSTRACT:
A method and apparatus for monitoring a particular location for the occurrence of a predetermined condition, such as fire, smoke, gas, etc., involves continuously transmitting, from a transmitter located at the monitored location, to a receiver, a source of electrical signals at a predetermined repetition rate having a period less than the interval between the electrical signals by at least one order of magnitude, and interrupting the transmission of the electrical signals upon sensing the predetermined condition. For example, the transmitted electrical signals may be coded bursts of pulses having burst periods of the order of milliseconds or nanoseconds, and spaced intervals of the order of seconds. Also, described is a parallel correlator which may be used as the decoder.

REFERENCES:
patent: 4101872 (1978-07-01), Pappas
patent: 4331953 (1982-05-01), Blevins et al.
patent: 4367458 (1983-01-01), Hackett
patent: 4442426 (1984-04-01), Heuschmann et al.
patent: 4978946 (1990-12-01), Nordholm et al.

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