Here's the relevant chapter in one of Julius Smith's books: https://ccrma.stanford.edu/~jos/filters/Transfer_Function_Analysis.html https://ccrma.stanford.edu/

Here's the relevant chapter in one of Julius Smith's books: https://ccrma.stanford.edu/~jos/filters/Transfer_Function_Analysis.html https://ccrma.stanford.edu/~jos/filters/Transfer_Function_An... It might not make total sense if you don't have any background in this area, but it's hopefully enough to give you an inkling.