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Your filter is a 5-tap delay line FIR filter. The FIR filter's coefficients are [2 6 1 5 1]. If x is your filter's input sequence and you execute the following MATLAB command:
h = [2 6 1 5 1];
you can then implement the filter (to produce a y output sequence) using the following MATLAB command:
y = filter(h, 1, x);
You can see your filter's frequency ...
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