Hefr(in2) absolute specification 1+δ magnitude response of equivalent analog system Passband i Transition Stopband δ He/) 1+δ 3dB cutoff Passband i Transition Stopband stope Figure 7. toleranc monotonous\ descent T toft -FeetenevFigure 7.2 magnitude response of equivalent analog system monotonous descent 1/ 2 c passband tolerance c stopband tolerance passband cutoff frequency stopband cutoff frequency 3dB cutoff frequency absolute specification