MATLAB: Zero phase spectrum and filtfilt function

filterfiltfiltspectrum

    Fs = 1;  % Sampling Frequency
    N    = 50;      % Order
    Fc1  = 1/f1;%7s   % First Cutoff Frequency
    Fc2  = 1/f2;     % Second Cutoff Frequency
    flag = 'scale';  % Sampling Flag
% Create the window vector for the design algorithm.
   win = hamming(N+1);
% Calculate the coefficients using the FIR1 function.
    [b,a] = fir1(N, [Fc1 Fc2]/(Fs/2), 'bandpass', win, flag);
% Hd = dfilt.dffir(b);
    out=filtfilt(b,a,data);
if using filter function ,we can get spectrum and phase using fvtool , while using filtfilt , how can i get the two lines?

Best Answer

With your [b,a] vectors, use the freqz function to get the Bode plot.
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