H - Electricity – 04 – R
Patent
H - Electricity
04
R
H04R 3/00 (2006.01) G08B 3/10 (2006.01)
Patent
CA 2323533
An alarm signaling device (5) operable to produce an alarm signal and, possibly, communicate emergency announcements when triggered by a signal from a central alarm control panel. The alarm includes a speaker or other sound producing device and a silencing circuit (14) that can be engaged by a person in the room to temporarily disable the speaker. The silencing circuit includes a timing circuit (30) and a switch (32) consisting of a pair of touch contacts (38, 40) that are activated by body resistance. The timing circuit (30) is operable to automatically re-enable the speaker after a predetermined time period has been measured. Furthermore, though the speaker has been silenced by the silencing circuitry (14), a reactivation circuit (15) continues to receive and process signals in order to identify a re-enablement signal by its particular frequency and duration. Once the re-enablement signal has been identified, the reactivation circuit (15) automatically overrides the silencing circuit (14) so that alarm signals or emergency announcements may be communicated.
Le Bel Vincent Victor
Gowling Lafleur Henderson Llp
Spx Corporation
LandOfFree
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