The eigen-delay all-pass correction algorithms
Javier J. Tapia, J.L. LoCicero, Guillermo E. Atkin · IEEE International Conference on Acoustics Speech and Signal Processing · 2002
An effective method to match a desired group delay function using an all-pass digital filter is presented. This iterative eigen-delay technique uses the Rayleigh principle to solve the least squares delay error problem. Performance improvement over other design techniques is evident for low and medium order filters when a mean-squared error metric is computed.