How does filter function works?

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khatereh
khatereh 2011-12-13
Hi,
I used edit filter to see how does it work but I did not find any relative information. I used FIR filter filter(b,1,signal). I need to know how does it work.
Thankss

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Daniel Shub
Daniel Shub 2011-12-13
See this filter documentation
doc filter
as well as this question: http://www.mathworks.com/matlabcentral/answers/9900-use-filter-constants-to-hard-code-filter
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khatereh
khatereh 2012-1-6
Thanks for your reply. I calculated coefficient b of low pass filter it is a FIR filter so the a is equal to 1. What should be the input value of z? if you look at the code the z gets updated each time and the final out put of the signal is related to that. I am confused. :(
Daniel Shub
Daniel Shub 2012-1-6
I am guessing you want to leave it out. The zi/zf input/outputs are most useful for when you are filtering in blocks. I believe that if you leave zi out, MATLAB assumes that the input has been zero for a very long time.

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