Introduce o In this chapter, we consider the FIr digita filter design problem o Unlike the iir digital filter design problem it is always possible to design FIr digital filters with exact linear-phase o In the case of fir digital filter design the stability is not a design issue as the transfer function is a polynomial in z -1Introduce  Unlike the IIR digital filter design problem, it is always possible to design FIR digital filters with exact linear-phase.  In the case of FIR digital filter design, the stability is not a design issue as the transfer function is a polynomial in z-1.  In this chapter, we consider the FIR digital filter design problem