FIR Filter Design

                           WINDOWING METHOD

FIR Filters have poles at origin. Thus, FIR filters are always stable. The order of FIR filters is given by 'N-1' where 'N' is the length of h(n).

FIR Filters can be designed by two ways 1) using a Window function 2) By Frequency Sampling method.

Focusing on the method of using a window function, a window function is a mathematical function that is zero-valued outside of some chosen interval.

Choice of the window function depends on the stop band attenuation required.

A scilab code for designing a High pass FIR filter with Hanning window was written and executed.