How does filter function works?

4 vues (au cours des 30 derniers jours)
khatereh
khatereh le 13 Déc 2011
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

Réponses (1)

Daniel Shub
Daniel Shub le 13 Déc 2011
  6 commentaires
khatereh
khatereh le 6 Jan 2012
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 le 6 Jan 2012
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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