ADAPTIVE FILTER

摘要

The present invention relates to a filter apparatus and method having a fixed aspect for providing a predetermined selectivity and having an adaptive aspect for determining the frequency response of said filter apparatus. The adaptive aspect is controlled to change the frequency response. Predetermined zero values of the filter characteristic are set to provide a predetermined filter selectivity; and at least one filter parameter is controlled to change pole values of the filter characteristic so as to provide frequency response adaptation. Thereby, the frequency response of the filter operation can change while the filter selectivity can be maintained. The filter apparatus is thus able to cope with advanced system requirements while keeping the complexity and power consumption low.