MATLAB: Is medfilt2 a zero-phase filter

medfilt2

Hello,

I am working on acoustic signal processing. I applied an AGC and a filter (with the filtfilt function) to my data set. As I still had a lot of noise I finally used the function medfilt2. Does it affect my phase? I mean… can I consider the medfilt as a zero-phase filter?

Thank you very much in advance!

ElsaC

Best Answer

medfilt2 is a median filter, which is a non-linear filter. So, no, it cannot be considered a zero-phase filter.

Related Solutions

MATLAB: Problem using medfilt2

Your Az vector is mainly concentrated around 169, therefore normal median filtering destroys the sudden peaks. Using Padding option as 'symmetric' might help. Refer the code below.

load cond2a.dat   
Ax = cond2a(:, 1);    
Ay = cond2a(:, 2);    
Az = cond2a(:, 3);    
Znew = medfilt2(Az, 'symmetric'); 
figure;  plot(Az);
hold on;
plot(Znew);
legend({'Original Data', 'Median filtered data'});

MATLAB: Analog low pass filter zero-phase

Hi Macro, you can access zero-phase zero-phase analysis method via Filter Designer App. https://www.mathworks.com/help/signal/ug/getting-started-with-filter-designer.html 1. Type filterDesigner in Command window. 2. Right-click the y-axis of the plot and select Zero-phase from the context menu.

You can also try function filtfilt: https://www.mathworks.com/help/signal/ref/filtfilt.html

Best Answer

Related Solutions

MATLAB: Problem using medfilt2

MATLAB: Analog low pass filter zero-phase

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