Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Reexamination Certificate
2008-12-23
2011-10-11
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
C333S167000, C333S181000
Reexamination Certificate
active
08035461
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.
REFERENCES:
patent: 3996537 (1976-12-01), Neuman
Edell Shapiro & Finnan LLC
Glenn Kimberly
Nortel Networks Limited
Pascal Robert
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