MATLAB: Help with H(z) response function

hz

Hello, i have simple task. Calculate the transfer function H(z). Figure shows block diagram of the filters structure. I think transfer function is :
a_parallel = parallel(Hz1,Hz2);
b_serial = series(a_parallel,Hz3);
But i dont know how to write H1(z), H2(z), H3(z). Anyone can help me to write H1(z), H2(z), H3(z)?

Best Answer

ts=1  % Sample time
H1=tf([2/3 2/5 4/7],[1 0 0],ts)
H2=tf([4/3 8/5 3/7],[1 0 0],ts)
H3=tf([3 2 4],[1 0 0],ts)
H=(H1+H2)*H3
%or
H=series(parallel(H1,H2),H3)
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