Patent ID: 6647115
Filing Date: 2003-11-11
Classification: H04B,H04M

Abstract:
In a communication system having a bidirectional transmission medium, an apparatus for canceling a near end signal from a far end signal, said apparatus comprising:a single transformer having (1) a transformer first winding for conveying said near end signal to said bidirectional transmission medium; (2) a transformer second winding coupled to said first winding and said transmission medium for outputting said near end signal onto said bidirectional transmission medium; and, (3) a transformer sense winding incorporated in said single transformer and galvanically isolated from both said first and second windings but magnetically coupled to said bidirectional transmission medium for receiving said far end signal from said bidirectional transmission medium and generating a sense winding output containing energy corresponding to both said near end signal and said far end signal; a replica network for generating a replica of said near end signal; and a receiver for combining said sense winding output and said replica to provide a receiver output signal that has a substantially reduced amount of near end energy.