Method and apparatus for increasing the response sensitivity and

Details Method and apparatus for increasing the response sensitivity and Method and apparatus for increasing the response sensitivity and

1982-05-05

1985-04-30

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340518, 340537, 340657, 340661, G08B 2900

Patent

active

045147205

ABSTRACT:
A method and apparatus for increasing the response sensitivity and the interference resistance in an alarm system such as a fire alarm system which cyclically samples a plurality of alarm units in the system for obtaining a series of measured values from each alarm unit, the measured values being utilized to form a quiescent value which is stored in a quiescent value memory. With each sampling cycle a current comparison value is formed from the alarm measured value, the stored quiescent value, and a comparison value from a previous sampling cycle stored in a comparison value memory. The current comparison value is then written in the comparison value memory as the new comparison value. The current comparison value is compared with a rated limiting value, and if the comparison value is greater than or equal to the rated limiting value, a display unit is activated indicating an alarm. If the comparison value is less than the rated limiting value, a new quiescent value is formed from the measured value and the stored quiescent value and written into the quiescent value memory.

REFERENCES:
patent: 4222041 (1980-09-01), Von Tomkewitsch et al.
patent: 4283717 (1981-08-01), Caldwell et al.
patent: 4313114 (1982-01-01), Lee et al.

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