Adjusting Alarm Drive Pulse for Changes in Temperature and Supply Voltage Via Microcontroller
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United States of America Patent
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Issued Date -
Nov 8, 2007
app pub date -
Mar 1, 2007
filing date -
Mar 2, 2006
priority date (Note) -
Abandoned
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Abstract
An audible alert device determines the effect of environmental factors upon the output sound pressure level of a transducer and establishes drive signal parameters adapted to the current operating environment. The drive signal parameters are based upon supply voltage, ambient temperature and/or resonant frequency. The drive signal is optionally a pulse width modulated signal for which the drive signal parameters represent the frequency and duty-cycle of the drive signal pulses. The audible alert device generates the drive signal using the drive signal parameters and delivers it to the transducer thereby controlling the output sound pressure level.
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