X. Zhang et H. Iwakura, NOVEL METHOD FOR DESIGNING DIGITAL ALLPASS FILTERS BASED ON EIGENVALUE PROBLEM, Electronics Letters, 29(14), 1993, pp. 1279-1281
A novel method is presented for designing digital allpass filters with
equiripple phase responses based on the eigen-value problem, and show
s that the optimal filter coefficient, can be easily obtained by compu
ting the maximum eigen-vector and applying an iteration procedure.