使用Farrow結構，片段二階多項式內插法。此法在1993被Erup在其paper(Interpolation in Digital Modems-Part 2)中提出，是以二階多項式內插法達到三階多項式內插的效果。-piecewise parabolic interpolation algorithm using Farrow structure. This method was proposed by Erup in 1993 in his paper "Interpolation in D