Review your notes on Simple Digital Filter Design p 94 Use M

Review your notes on \"Simple Digital Filter Design\" (p. 9-4). Use MATLAB to generate plots of |H_LP(omega)| for a first order low pass filter for the following values: alpha = 0.5, 07, 0.9 alpha = -0.5, -0.7, -0.9 What trend do you observe as alpha changes for graphs (a) and (b)? Explain this trend with regard to the pole and zero locations.

Solution

(a) MATLAB Progrm

num= [ 0.5 0.7]

den==0.9]

trans function= tf(num,den)

plot(tf)

grid on

(b)

num= [ -0.5 -0.7]

den=[-0.9]

trans function= tf(num,den)

plot(tf)

grid on

In both the above graph we are getting low pass filter of order 1

but in (b), graph is more converging in nature