A nearly optimal variable fractional delay filter with extracted Chebyshev window

A novel technique for designing a nearly optimal (in the Chebyshev sense) FIR variable fractional delay filter is presented that offers rapid recalculation of the filter coefficients according to the varying fractional delay parameter. The idea of the technique lies in using a fixed window extracted from a strictly optimal linear-phase design and in updating the filter coefficients in a numerically efficient way typical of windowing method