US Patent 7268671 Shaped modulation audible alarm
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Patent Inventor Names
Daniel E. Zimmermann0
David C. Copley0
Michael S. McDaniel0
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Patent abstract
A method and apparatus for providing an audible alarm signal. The method and apparatus includes creating a rectangular pulse signal having a desired period and a desired first amplitude, adding a shaped modulation component to the rectangular pulse signal from the desired first amplitude to a desired second amplitude to create a modulating waveform, creating a carrier signal, and combining the carrier signal and the modulating waveform to create the audible alarm signal.
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US Patent 07268671 Shaped modulation audible alarm US Patent 7268671 Shaped modulation audible alarm
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Patent Number
07268671
Patent Number
7268671
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Official Website
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US Patent 07268671 Shaped modulation audible alarm
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Is a
Patent jurisdiction
Patent number
07268671
Date of patent
September 11, 2007
Patent application number
10873875
Date Filed
June 22, 2004
Patent primary examiner
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