7.3 Digital Filter Design: Basic approaches Most common approach to IIR filter design (1)Convert the digital filter specifications into an analog prototype lowpass filter specifications (2)Determine the analog lowpass filter transfer function H(s) (3)Transform H.(s)into the desired digital transfer function G(z)§7.3 Digital Filter Design: Basic Approaches • Most common approach to IIR filter design – • (1) Convert the digital filter specifications into an analog prototype lowpass filter specifications • (2) Determine the analog lowpass filter transfer function Ha(s) • (3) Transform Ha(s) into the desired digital transfer function G(z)