Two-pass recursive digital filter with zero phase shift
John J. Kormylo, V.K. Jain · IEEE Transactions on Acoustics Speech and Signal Processing · 1974
A two-pass recursive scheme is proposed for realizing zero phase shift filters with arbitrary magnitude characteristics. The first pass is performed in forward time and the second in reverse time. The effect of initial and reverse time transients is discussed, and a scheme for quasi on-line adaptation is presented.