Digital Signal Processing and Digital Filters
Practice Sheet 07
1) The Direct Form. I and Direct Form. II of digital filters are depicted in the diagrams below.
Let the input initial conditions be x[0] = −1 and x[1] = 2. Find y0 , y1 , t0 , t1 such that, if yI [i] = yII [i] = yi and t [i] = ti, i = 0, 1, then the two forms are equivalent, i.e., yI [n] = yII [n] , ∀n ∈ Z.
2) Let y [n] be the output of a linear system as depicted below
(a) Convert the block diagram into an equivalent transposed form,
(b) Derive the transfer function of the original block diagram and compute the values of b [i] , i = 0, 1, 2 and a [i] , i = 0, 1 from its Direct Form I/II representation as shown in the diagram of Question 1.
3) Let a linear system be described by
(a) Calculate the zeros and poles of the system.
(b) Write the system as the product of two biquads such that ensure a low peak gain.
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