Detection of a characteristic of a periodic waveform
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United States of America Patent
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Apr 2, 2013
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N/A
app pub date -
Jul 7, 2010
filing date -
Jul 7, 2009
priority date (Note) -
Expired
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Abstract
A method and apparatus for providing an interface between a communications device and a medium carrying an approximately periodic waveform are presented. The method includes providing a first signal in response to detecting a predetermined characteristic of the approximately periodic waveform using switching circuitry that draws a first amount of power drawn from the medium, and in response to the first signal, detecting the predetermined characteristic of the approximately periodic waveform using detecting circuitry that draws a second amount of power drawn from the medium, where the detecting circuitry detects the predetermined characteristic with greater accuracy in time than the switching circuitry detects the predetermined characteristic, and the second amount of power drawn from the medium is greater than the first amount of power.
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