ADAPTIVT DIGITALT FILTER MED EN IKKE REKURSIV DEL OG EN REKURSIV DEL

摘要

An adaptive digital filter comprises a non-recursive part and a recursive part, which can be updated in a simple and positive way. The recursive part of the filter is provided with a number of special, permanently-set recursive filters 13-16 with different impulse responses and a linear composition is formed with adaptive weighting factors W0-W3 of the output signals from the recursive filters 13-16. The filter is updated by one and the same signal e(n) being used for updating the non-recursive part 11 of the filter and the adaptive weighting factors W0-W3 in the recursive part of the filter. <IMAGE>