IIR digital filters with equiripple stopband transmission
Rolf Unbehauen · IEEE Transactions on Acoustics Speech and Signal Processing · 1985
Recently, a simple technique of introducing transmission zeros into a low-pass all-pole filter transfer function to make its stop-band transmission equiripple has been described by Hazra [1]. It is shown that this technique represents a special case of a more general procedure which Provides not only Hazra's solution, but also additional filters which are advantageous with regard to the required number of multiplications per sample. The results are demonstrated with the aid of an example.