Filter Realizations - Introduction to Digital Signal Processing and Filter Design - page 353

6.34 Design a lowpass Butterworth filter with W p

= 0 . 3, W s = 0 . 6, A p = 0 . 25,

A s =

55 in an lattice-coupled allpass structure. Give the magnitude response
of the Butterworth filter and the lattice-coupled allpass filter on the same plot.
6.35 Design a Chebyshev lowpass IIR filter with the specifications from Prob-
lem 6.34 in a lattice-coupled allpass structure. Give the magnitude response
of the Chebyshev filter and the lattice-coupled allpass filter structure for
the same filter on the same plot.
6.36 Design an elliptic lowpass IIR filter W p = 0 . 25, W s = 0 . 5, A p = 0 . 20,
A s = 60, in a lattice-coupled allpass structure. Give the magnitude
response of the elliptic filter and the lattice-coupled allpass filter for the
same filter on the same plot.

REFERENCES

1. S. K. Mitra and K. Hirano, Digital allpass networks, IEEE Trans. Circuits Syst. CAS-21 ,
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3. S. K. Mitra, Digital Signal Processing—A Computer Based Approach . McGraw-Hill,
2001.
4. S. K. Mitra and J. F. Kaiser, eds., Handbook for Digital Signal Processing , Wiley-
Interscience, 1993.
5. B. A. Shenoi, Magnitude and Delay Approximation of 1-D and 2-D Digital Filters ,
Springer-Verlag, 1999.