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%% Phase Response of an Elliptic Filter % Design an elliptic lowpass IIR filter with normalized passband frequency % $0.4\pi$ rad/s, normalized stopband frequency $0.5\pi$ rad/s, passband % ripple 1 dB, and stopband attenuation 60 dB. Display the phase response % of the filter. % Copyright 2015 The MathWorks, Inc. %% d = designfilt('lowpassiir', ... 'PassbandFrequency',0.4,'StopbandFrequency',0.5, ... 'PassbandRipple',1,'StopbandAttenuation',60, ... 'DesignMethod','ellip'); phasez(d)