MATLAB: Butterworth filter in MATLAB: zero lag

bidirectionalbutterworth filter

I am wondering if MATLAB uses a bidirectional filter (zero lag) for butterworth lowpass filtering?

Best Answer

fc    = 300;
fs    = 1000;
[b,a] = butter(6,fc/(fs/2), 'low');
yy    = filtfilt(b, a, y)
If you ask an internet search engine for "MATLAB uses a bidirectional filter zero lag", the docs of filtfilt are the 2nd match after your own question. See also doc butter.
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