Howtosignalprocessing
How to design digital IIR filter?
In general, the design of an IIR filter usually involves one or more strategically placed poles and zeros in the z-plane, to approximate a desired frequency response. An analogue filter can always be described by a frequency- domain transfer function of the general form, shown in Equation 5.1.
How are digital filters designed?
Design of digital filters, involve the use of both frequency domain and time domain techniques. This is because, the filter specifications are often specified in frequency domain and the implementation is done in time-domain in the form of difference equations.
