On impulse response symmetry of Farrow interpolators in rational sample rate conversion

In this paper, the impulse response symmetry of Farrow interpolation filters and its significance in rational sample rate conversion is addressed. Four methods for ensuring impulse response symmetry are proposed. Comparison of different symmetrization schemes is made, with filters optimized based on the discrete-time impulse response model. The results indicate that optimization based on the discrete-time model often results in better performance than optimization based on the continuous-time model, and that there are significant performance differences between symmetrization schemes.