Meter pulse filtering circuit for analog modems
AssigneeInfineon Technologies AG
InventorRainer Storn
Life of this patent
Estimating the term…
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.
Claims12
A filtering circuit for filtering out meter pulses of analog telephone connections, consisting essentially of:
- a plurality of resistors;
- and
- a plurality of capacitors connected to said resistors such that an RC filter is formed for filtering out the meter pulses.
An improved filtering circuit for filtering out meter pulses of analog telephone connections, the filtering circuit formed of filtering components for forming a filter, the improvement comprising:
- wherein the filtering components consist essentially of:
- a plurality of resistors;
- and
- a plurality of capacitors connected to said resistors such that the filter is an RC filter for filtering out the meter pulses.
In combination with analog telephone connections, a filtering circuit for filtering out meter pulses of the analog telephone connections, the filtering circuit consisting essentially of:
- a plurality of resistors;
- and
- a plurality of capacitors connected to said resistors such that an RC filter is formed for filtering out the meter pulses.
A filtering circuit for filtering out meter pulses of analog telephone connections, comprising exclusively of:
- a plurality of resistors;
- and
- a plurality of capacitors connected to said resistors such that an RC filter is formed for filtering out the meter pulses.
Dependencies are inferred from the claim text.