A Novel Real-Time Implementation for Network Echo Cancellation System

This paper describes a novel structure and its implementation method of a long-distance network echo canceller. The proposed NEC system copes with double talking situations by using a modified double-talk detector. An improved adaptive filter structure is also presented based on algorithm delay estimator. To deal with residual echo after filtering a nonlinear processor is employed. The resulting algorithm enables long-distance network echo cancellation with low computational requirements. It reached grater echo return loss enhancement and shows faster convergences speed as compared with conventional network echo canceller.