Patent ID: 7860236
Filing Date: 2010-12-28
Classification: H04B

Abstract:
1. In a network switch that includes a first echo canceller and a second echo canceller comprising a first sub-component echo canceller and a second sub-component echo canceller, a method of cancelling echo, the method comprising: adjusting the first echo canceller according to a test echo signal, the test echo signal being generated by a first echo path, the first echo path being located in the network switch; receiving a signal comprising a first echo signal and a second echo signal, the first echo signal being generated by the first echo path, and the second echo signal being generated by a second echo path, the second echo path being located externally to the network switch; cancelling the first echo signal with the first echo canceller; adjusting the second echo canceller according to the second echo signal by concurrently applying each of the first and second sub-component echo cancellers to the second echo signal, outputting a first error signal from the first sub-component echo canceller and outputting a second error signal from the second sub-component echo canceller, and adjusting the second sub-component echo canceller to minimize the second error signal; and cancelling the second echo signal with the second echo canceller.