Apparatus and method for synchronizing visual/audible alarm units in an alarm system
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United States of America Patent
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Mar 15, 2011
Grant Date -
Oct 30, 2008
app pub date -
Jul 15, 2008
filing date -
Mar 20, 1995
priority date (Note) -
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Abstract
An apparatus and concomitant method of reducing the number of synchronization pulses transmitted to the alarm units for increasing the reliability of the overall alarm system is disclosed. The synchronization signal is implemented as a reference or reset signal from which the alarm units derive a reference time to begin activation of the alarm units. Thus, when an alarm unit receives a reference synchronization pulse, the alarm unit applies the reference synchronization pulse as a reference point in time to trigger a series of flashes or audio tones. A second signal sent in close proximity to the synchronization signal is implemented to trigger a second function of the alarm units, such as a silence function.
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