Ideal lowpass Filter CT h(1) 兀t HgO Noncausal h(t<0)≠0 · Oscillatory response—e.g. step response Overshoot by 9% s(t) Gibbs phenomenon TdT 109 h(r)di 1/2 H(0) 0 OcIdeal Lowpass Filter CT ←⎯ → • Noncausal h(t <0) ≠ 0 • Oscillatory Response — e.g. step response Overshoot by 9%, Gibbs phenomenon