Patent ID: 7095849

Claim:
A modular filter apparatus for filtering a voice signal delivered over a digital subscriber line between a first communication circuit and a second communication circuit, the voice signal including analog and digital portions, the modular filter apparatus comprising: a connector for receiving the voice signal delivered over the digital subscriber line from a first communication circuit; a high pass filter including at least one capacitor operatively associated with the connector to block the analog portion of the voice signal while passing the digital portion; a low pass filter including at least one inductor operatively associated with the connector to block the digital portion of the voice signal while passing the analog portion; a receptacle operatively associated with the high pass filter and a second receptacle operatively associated with the low pass filter for receiving a connection element to make electrical contact between the first communication circuit and the second communication circuit; and a selector switch operativly associated with the high pass filter and the low pass filter and selected changeable to simultaneously or alternately operatively associate the receptacle with the high pass filter and the second receptacle with the low pass filter, thereby providing a modular filter apparatus that serves every selection choice depending on the needs of a user.