Inductive filter and method of reducing vibration sensitivity
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United States of America Patent
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Oct 11, 2011
Grant Date -
N/A
app pub date -
Dec 23, 2008
filing date -
Dec 26, 2007
priority date (Note) -
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Abstract
A filter according to a present invention embodiment reduces the effects of microphonic behavior in a communications network. The filter passes a network signal, while filtering out unwanted voiceband leakage (e.g., emissions of plaintext voice signals) due to microphonic behavior of the network equipment. The filter employs inductive units each including at least two inductive elements connected in series and arranged to cancel current within the inductive elements induced by vibrations and/or sound pressure (or acoustic) waves in the surrounding environment, thereby reducing extraneous signals produced within the filter (e.g., signals produced from microphonic behavior that may be in the form of perceivable voice or audio, noise, etc.). The filter reduces the extraneous signals in active and passive modes, and prevents compromise of secure or sensitive information (e.g., in the form of perceivable voice or audio) due to microphonic behavior of filter elements.
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