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ADAPTION OF NON-LINEAR FILTER, NON-LINEAR ADAPTIVE FILTER AND ECHO CANCELLER
ADAPTION OF NON-LINEAR FILTER, NON-LINEAR ADAPTIVE FILTER AND ECHO CANCELLER
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机译:非线性滤波器,非线性自适应滤波器和回声消除器的自适应
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摘要
A non-linear adaptive filter is described having a linear filter connected in parallel with a non-linear filter. The linear filter provides fast adaption until it has modelled the linear contribution of each coefficient. Thereafter the non-linear filter continues to adapt until the error signal has been reduced to an acceptable level. In a preferred embodiment a plurality of unit delay devices provide taps to sub-processing units each of which is arranged to be adapted according to a linear algorithm during an initial part of a training period, and to a non-linear algorithm after said initial part. The filter has particular use in echo cancellers for data modems.
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