Infinite Impulse Response Filters - Digital Signal Processing and Applications with the C6713 and C6416 DSK - page 187

FIGURE 5.10. N th-order IIR lattice filter structure with both poles and zeros.

FIGURE 5.11. Third-order IIR direct form II filter structure.

coefficients, can be computed recursively,

N
=-

= Â

(5.27)

ca cb , i = 01 , ,..., N

( ) i i r r r - i

ri 1

A more thorough discussion can be found in [6] and [7].

Exercise 5.2: Lattice Structure with Poles and Zeros

This exercise converts a third-order IIR direct form II structure into a lattice struc-
ture. Figure 5.11 shows a third-order IIR filter using the direct form II, and Figure