Method and apparatus for alarm volume control using pulse width modulation
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United States of America Patent
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Jul 18, 2006
Grant Date -
Mar 3, 2005
app pub date -
Jun 24, 2004
filing date -
Aug 20, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided herein a first preferred arrangement of the instant invention, wherein an electronic patient monitor utilizes a computer CPU as an alarm signal generator, which CPU is preferably directly connected to a power amplifier and/or a speaker without an intervening (or subsequent) conventional volume control. The alarm signal is preferably expressed as a series of square waves. The volume of the alarm signal as heard through the speaker is controlled by varying the width of the square waves that represent the alarm signal with the duty cycle of the square waves being shortened to reduce the output alarm volume and lengthened to increase it.
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