Communications: electrical – Systems – Call station
Patent
1976-07-19
1978-05-23
Swann, III, Glen R.
Communications: electrical
Systems
Call station
340224, 340261, G08B 1322
Patent
active
040913660
ABSTRACT:
A detector is positioned in each of a plurality of protected zones for converting detected sound into electric signals which are amplified and fed to operatively associated discriminators which generate an alarm signal responsive to the detection of electric signals indicative of the occurrence of an alarm condition. Security personnel stationed at locations remote to the zones in which the alarm condition occurred are automatically notified of the occurrence and location of the alarm condition for purposes of taking remedial action. A local annunciator system is provided to notify further security personnel of the occurrence and location of the alarm condition and includes an audio system which is actuated automatically, in the preferred embodiment, responsive to the generation of an alarm signal by one of the discriminators for purposes of continuously monitoring the zone within which the alarm condition occurred to determine the nature of the alarm condition to the end that appropriate remedial action can be taken.
REFERENCES:
patent: 3705401 (1972-12-01), Scott
patent: 3713125 (1973-01-01), Miller
patent: 3848231 (1974-11-01), Wootton
patent: 3864674 (1975-02-01), Worsham et al.
J.H. McDaniel Tele-Communications, Inc.
Swann III Glen R.
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