Freqz(num,den)

Hello, could someone explain me how MatLAB creates a filter using fraction numerator and denominator? Its a little bit confusing, as the help section did not show anything like this. Thank you.

Answer 1

[Star Strider]

MATLAB does it the way all signal processing techniques have done it for decades. See any signal processing text for details on how it works. It is a much too detailed topic to explain here.