Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Charles F. Fisler0
Simon Ha0
Manley S. Keeler0
Date of Patent
March 10, 2009
0Patent Application Number
119243640
Date Filed
October 25, 2007
0Patent Primary Examiner
Patent abstract
An audible output device, of a type usable in a fire alarm system, incorporates a multi-frequency waveform generator. The generator produces a plurality of frequencies with predetermined duty factors during various time intervals on a repetitive basis. The multi-frequency drive signal is in turn coupled to an audible output device such as a piezoelectric horn or the like. The multi-frequency audio output provides an indicator to persons adjacent to the device of the presence of an alarm condition.
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