Abstract:
Digital filters used in the equalization of loudspeakers try in some applications to achieve a digital approximation of analog filters. The bilinear z transform (BZT) and the matched pole-zero transform (MPZT or MZT) are often used with less than satisfactory results. Recently a new MZT transform, called MZTi, was introduced, which yields filters with magnitude and phase responses that match their analog target filters better. A novel s-to-z transform that yields often closer approximations to the analog target filters than the MTZi method is described.