modified Farrow structure was proposed by Johansson and Lowenborg [9], where the subfilters are designed to have linear phase (symmetric coefficients), which also reduces the overall implementation complexity.
Farrow
structure is an efficient way to realize tunable filter characteristics such as variable fractional delay , sampling rate conversion (SRC) and variable cut-off frequencies .
In a variable fractional delay filter, all the input samples are delayed by a factor, whereas in SRC, every input sample is delayed by varying factors.