Comments on "Synthesis of Spectrum Shaping Digital Filters of Recursive Design
Kishan Shenoi, Madihally J. Narasimha, A. M. Peterson · IEEE Transactions on Circuits and Systems · 1975
The problem of designing recursive digital filters can be reduced to polynomial approximation on a finite interval. The procedure to demonstrate this equivalence described in a recent paper yielded filters with multiple poles. An alternative method is described which avoids this restriction.