An efficient design or fractional-delay digital FIR filters using the Farrow structure

Fractional-delay digital filter (FD-DF), implemented using the Farrow (1988) structure, is very attractive in providing online tuning delay of digital signals. This paper proposes a new method for the design of such Farrow-based FD-DF using sum-of-powers-of-two (SOPOT) coefficients. Using the SOPOT coefficient representation, coefficient multiplication can be implemented with limited number of shifts and additions. Design examples show that the proposed method can greatly reduce the design time and complexity of the Farrow structure while providing comparable phase and amplitude responses.published_or_final_versio

On the design and efficient implementation of the Farrow structure

This letter proposes an efficient implementation of the Farrow structure using sum-of-powers-of-two (SOPOT) coefficients and multiplier-block (MB). In particular, a novel algorithm for designing the Farrow coefficients in SOPOT form is detailed. Using the SOPOT coefficient representation, coefficient multiplication can be implemented with limited number of shifts and additions. Using MB, the redundancy between multipliers can be fully exploited through the reuse of the intermediate results generated. Design examples show that the proposed method can greatly reduce the complexity of the Farrow structure while providing comparable phase and amplitude responses.published_or_final_versio