Subscriber circuit capable of suppressing in-phase induced noise

摘要

A subscriber circuit has, in a subscriber line section thereof an in-phase induced noise suppressing circuit which is made up of two series connections of a capacitor and a non-linear element. When an intermittent high-voltage signal is being propagated on another subscriber loop, the noise suppressing circuit suppresses it to thereby prevent it from being transmitted to terminal equipment as noise. Since the degree of suppression of the in-phase induced noise can be limited as desired, the subscriber circuit is advantageously applicable to terminal equipment or line equipment having a line interface implemented as an LSI integrated circuit.