FIR Filter Design: Windowing Method

If you have read previous posts, then you will be familiar with IIR filters. But how about FIR filters?

These are filters that have a Finite Impulse Response. In these, the order means the length of the impulse response. Broadly, the method for designing the filter is the same as IIR filters. You input the formulae in a Scilab code and run the program. But the formulae are different, meaning, the pen and paper method is different. 

We used a Hanning Window as the window function and wrote the code accordingly. During execution, the filter parameters like the attenuations and frequencies were given as user input. The plot function was used to verify the response of the designed filter. A notable difference between IIR and FIR designing is that much of the calculation is done in time domain rather than the transform domain.