Echo canceling method and device for multiplex line
AssigneeNEC Corporation
InventorAkihiko Sugiyama
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Abstract
The present invention relates to an echo canceling method and apparatus for simultaneously erasing echoes produced on a plurality of transmission paths. It is an object of the present invention to provide an echo canceling method and apparatus for multiplexed lines which require a short convergence time and a less amount of operations. As a means for solving the problem of the present invention, 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.
Claims22
An echo canceling method for multiplexed lines, wherein an adaptive filter is installed on each line to cancel echoes on the multiplexed lines, said method, comprising the steps of:
- evaluating a convergence degree and an input signal intensity of each adaptive filter provided for said each line;
- and
- distributing a total number of coefficient updates per unit time given by a predefined number for all the lines in accordance with said convergence degree and input signal intensity.
An echo canceling apparatus for multiplexed lines comprising:
- a plurality of adaptive filters provided for a plurality of lines, respectively;
- and
- a control circuit for receiving information on convergence degrees and input signal intensities from said plurality of adaptive filters to generate a coefficient update control signal for controlling a number of coefficient updates in each said adaptive filter by distributing a total number of coefficient updates per unit time given by a predefined number for all the lines in accordance with said convergence degrees and input signal intensities.
Dependencies are inferred from the claim text.