US Patent 7355989 Echo canceling method and device for multiplex line

An echo canceling method and apparatus for simultaneously erasing echoes produced on a plurality of transmission paths, for multiplexed lines which require a short convergence time and a less amount of operations. The echo canceling apparatus has a control circuit (70) which receives information on convergence degrees and input signal intensities from a plurality of adaptive filters (80, 81, 82) to distribute a number of coefficient updates to each adaptive filter corresponding to the information.