A New hybrid window based on Cosh and Hamming windows for nonrecursive digital filter design

This study proposes a new window function, namely Cosh-Hamming, for the nonrecursive digital filter design. The proposed window is obtained by the combination of two different windows in literature, known as Cosh and Hamming. First, the effect of adjustable independent parameter of proposed window on filtering characteristic in terms of minimum stopband attenuation and transition bandwidth parameters is examined for filter length N=51. Then, to evaluate the performance of the proposed window in filter application, a numerical comparison example with other well-known two parameter windows in literature is presented for filter length N = 127. The computer simulation results confirm that the proposed window can provide a better filter performance compared to Kaiser, Dolph-Chebyshev and Cosh windows because, for fixed filter length and transition bandwidth parameters, the filter designed by the proposed window can provide better minimum stopband attenuation.