An analytical approach to the design of nonrecursive digital filters
J. Hill, Robert Linggard, A.G.J. Holt · IEEE Transactions on Acoustics Speech and Signal Processing · 1975
This correspondence describes an analytical approach to the design of nonrecursive digital filters where Chebyshev functions are used to obtain filter transfer characteristics with equiripple behavior in both the passband and stopband. The resulting filters are of length 2npns+ 1 compared with optimal filters of length 2(np+ ns) - 1.