Design of FIR filter using window method

In this experiment, we designed Linear phase FIR filter using window functions and observed their spectrum of the filter. Depending upon the value of Passband attenuation, appropriate window function was chosen from Rectangular, Bartlett, Hanning, Hamming, and Blackman.We used a Hanning Window as the window function and wrote the code accordingly. In this experiment, the value of As and Ap are verified. As we go on increasing As depending on the filter the side lobe width decreases & main lobe width increases.  Phase response varies linearly with frequency, thus no distortion is observed at the output of the filter.