Programmable fractional sample delay filters with flatnesscompromise between magnitude response and group delay

摘要

In this paper, a new design of fractional sample delay filter isnpresented. This method is based on the Stancu polynomial, whichnpossesses an extra parameter Α. Under special choice of thisnparameter, the results obtained are identical to previous ones based onnLagrange interpolation formula. Much more flatness of group-delaynresponse can be achieved at the sacrifice of the filter magnitudenresponse. Thus, this method provides designers with more flexibility forntrading between these two performance criteria