Question: Using the fir1 function in MATLAB, design a 41-tap lowpass filter with a normalized cut-off frequency of ?n = 0.55 using
(i) rectangular; (ii) Hamming;
(iii) Blackman; and
(iv) Kaiser (with β = 4) windows. Plot the amplitude-frequency characteristics for the four filters. For each plot, determine
(i) the maximum pass-band ripple;
(ii) the peak side lobe gain; and
(iii) the transition bandwidth. Assume that the transition band is a band where the filter gain drops from -2 dB to -20 Db