Meter pulse filtering circuit for analog modems
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United States of America Patent
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Jan 11, 2005
Issued Date -
N/A
app pub date -
Feb 26, 2001
filing date -
Aug 25, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A filtering circuit is described for filtering out meter pulses of analog telephone communication, for example in analog modems. The circuit is mainly composed of resistors and capacitors and is configured as a double T element or a Wien bridge circuit. The filtering circuit is needed for attenuating interferences to such an extent that integrated circuits operating with low voltages are not overloaded.
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