Extension of a method for sharpening the response of digital filters based on the amplitude change function
T. Claasen, W. Mecklenbräuker · IEEE Transactions on Acoustics Speech and Signal Processing · 1979
The method for sharpening the frequency response of digital filters, as proposed by Kaiser and Hamming, for symmetric nonrecursive digital filters is extended to recursive digital filters. Basic to this extension is the observation that the phase of a cascade of two identical prototype filters can be realized exactly.