FILTER DIGITIZATION BASED ON POLYNOMIAL INTERPOLATION

The correspondence describes a polynomial interpolation based filter digitization technique which aims to preserve an analog system's frequency response. It is shown that the procedure is capable df digitizing non bandlimited, including highpass, analog filters. In most cases considered, it results in digital filters whose frequency response is closer to the frequency response of the analog filter than that of filters designed using impulse invariance or the bilinear transformation.