Programmable fractional sample delay filters with flatness compromise between magnitude response and group delay

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In this paper, a new design of fractional sample delay filter is presented. This method is based on the Stancu polynomial, which possesses an extra parameter /spl alpha/. Under special choice of this parameter, the results obtained are identical to previous ones based on Lagrange interpolation formula. Much more flatness of group-delay response can be achieved at the sacrifice of the filter magnitude response. Thus, this method provides designers with more flexibility for trading between these two performance criteria.