Stability Condition in Terms of the pole locations The stability testing of a IiR transfer function is therefore an important problem In most cases it is difficult to compute the infinite sum n<oo n=-0 For a causal iir transfer function the sum s can be computed approximately as K SK=∑=01n Copyright C 2001, S K. MitraCopyright © 2001, S. K. Mitra 10 Stability Condition in Terms of the Pole Locations • The stability testing of a IIR transfer function is therefore an important problem • In most cases it is difficult to compute the infinite sum • For a causal IIR transfer function, the sum S can be computed approximately as =     n=− S h[n]  − = = 1 0 K n S h[n] K