zero phase spectrum and filtfilt function

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Roger
Roger 2015-6-4
评论： Star Strider 2015-6-5
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?

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Star Strider
Star Strider 2015-6-4
With your [b,a] vectors, use the freqz function to get the Bode plot.
  2 个评论
Roger
Roger 2015-6-5
freqz(b,a) is just the fir filter spectrum, i mean the zero phase spectrum.
Star Strider
Star Strider 2015-6-5
What do you mean ‘zero phase spectrum’?
The Bode plot gives you the magnitude and phase. That’s all you need.

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