Objective- Determination of a realizable transfer function G(z approximating a given frequency response specification is an important step in the development of a digital filter If an IIR filter is desired, G(z should be a stable real rational function Digital filter design is the process of deriving the transfer function g(z)• Objective - Determination of a realizable transfer function G(z) approximating a given frequency response specification is an important step in the development of a digital filter • If an IIR filter is desired, G(z) should be a stable real rational function • Digital filter design is the process of deriving the transfer function G(z)