Programmable fractional sample delay filter with Lagrange interpolation
G.-S. Liu, C.-H. Wei · Electronics Letters · 1990
A new linear time-invariant FIR filter which can be programmed to synthetise any fractional sample delay with Lagrange interpolation is presented. An analytic closed-form expression for the coefficients of such an FIR filter is derived. Computer verification is provided for the N = 4 case.